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Dr. Iman Faridmehr
Senior Research Assistant, South Ural State University, 454080 Chelyabinsk, Lenin Prospect 76, Russian Federation, Russia

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0 Earthquake Engineering
0 Sustainable Design
0 Progressive collapse
0 green concrete
0 post tensioned structures

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Journal article
Published: 02 July 2021 in Sustainability
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Self-compacting concrete (SCC) became a strong candidate for various construction applications owing to its excellent workability, low labor demand, and enhanced finish-ability, and because it provides a solution to the problem of mechanical vibration and related noise pollution in urban settings. However, the production of Portland cement (PC) as a primary constituent of SCC is energy-intensive, contributing to about 7% of global carbon dioxide (CO2) emissions. Conversely, the use of alternative geopolymer binders (GBs) in concrete can significantly reduce the energy consumption and CO2 emissions. In addition, using GBs in SCC can produce unique sustainable concrete with unparallel engineering properties. In this outlook, this work investigated the development of some eco-efficient self-compacting geopolymer concretes (SCGCs) obtained by incorporating different dosages of fly ash (FA) and ground blast furnace slag (GBFS). The structural, morphological, and mechanical traits of these SCGCs were examined via non-destructive tests like X-ray diffraction (XRD) and scanning electron microscopy (SEM). The workability and mechanical properties of six SCGC mixtures were examined using various measurements, and the obtained results were analyzed and discussed. Furthermore, an optimized hybrid artificial neural network (ANN) coupled with a metaheuristic Bat optimization algorithm was developed to estimate the compressive strength (CS) of these SCGCs. The results demonstrated that it is possible to achieve appropriate workability and mechanical strength through 50% partial replacement of GBFS with FA in the SCGC precursor binder. It is established that the proposed Bat-ANN model can offer an effective intelligent method for estimating the mechanical properties of various SCGC mixtures with superior reliability and accuracy via preventing the need for laborious, costly, and time-consuming laboratory trial batches that are responsible for substantial materials wastage.

ACS Style

Iman Faridmehr; Moncef Nehdi; Ghasan Huseien; Mohammad Baghban; Abdul Sam; Hassan Algaifi. Experimental and Informational Modeling Study of Sustainable Self-Compacting Geopolymer Concrete. Sustainability 2021, 13, 7444 .

AMA Style

Iman Faridmehr, Moncef Nehdi, Ghasan Huseien, Mohammad Baghban, Abdul Sam, Hassan Algaifi. Experimental and Informational Modeling Study of Sustainable Self-Compacting Geopolymer Concrete. Sustainability. 2021; 13 (13):7444.

Chicago/Turabian Style

Iman Faridmehr; Moncef Nehdi; Ghasan Huseien; Mohammad Baghban; Abdul Sam; Hassan Algaifi. 2021. "Experimental and Informational Modeling Study of Sustainable Self-Compacting Geopolymer Concrete." Sustainability 13, no. 13: 7444.

Journal article
Published: 27 May 2021 in Buildings
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The behavior of beam-to-column connections significantly influences the stability, strength, and stiffness of steel structures. This is particularly important in extreme non-elastic responses, i.e., earthquakes, and sudden column removal, as the fluctuation in strength and stiffness affects both supply and demand. Accordingly, it is essential to accurately estimate the strength and stiffness of connections in the analysis of and design procedures for steel structures. Beginning with the state-of-the-art, the capacity of three available component-based mechanical models to estimate the complex mechanical properties of top- and seat-angle connections with double-web angles (TSACWs), with variable parameters, were investigated. Subsequently, a novel hybrid krill herd algorithm-artificial neural network (KHA-ANN) model was proposed to acquire an informational model from the available experimental dataset. Using several statistical metrics, including the corresponding coefficient of variation (CoV), correlation coefficient (R), and the correlation coefficient provided by the Taylor diagram, this study revealed that the krill herd-ANN model achieved the most reliable predictive accuracy for the strength and stiffness of top- and seat-angle connections with double web angles.

ACS Style

Iman Faridmehr; Mehdi Nikoo; Mohammad Baghban; Raffaele Pucinotti. Hybrid Krill Herd-ANN Model for Prediction Strength and Stiffness of Bolted Connections. Buildings 2021, 11, 229 .

AMA Style

Iman Faridmehr, Mehdi Nikoo, Mohammad Baghban, Raffaele Pucinotti. Hybrid Krill Herd-ANN Model for Prediction Strength and Stiffness of Bolted Connections. Buildings. 2021; 11 (6):229.

Chicago/Turabian Style

Iman Faridmehr; Mehdi Nikoo; Mohammad Baghban; Raffaele Pucinotti. 2021. "Hybrid Krill Herd-ANN Model for Prediction Strength and Stiffness of Bolted Connections." Buildings 11, no. 6: 229.

Journal article
Published: 21 May 2021 in Construction and Building Materials
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Lately, sustainable concretes with enhanced strength performance and ductility became demanding for the construction sector. Various industrial by-products as environmental friendly wastes were shown to be promising to achieve such concretes. Meanwhile, due to the rapid industrial developments and modernized lifestyle, the tire wastes became a serious environmental concern. Inclusion of these tire wastes into the concretes was demonstrated to be beneficial to design the rubber-modified sustainable concretes. Based on this factor, we prepared several rubberized concrete mixes by integrating the Ground Blast Furnace Slag (GBFS) with different contents of Discarded Rubber Tire Crumbs (DRTCs). All the designed rubber-modified mixes were characterized using diverse analytical techniques to determine their mechanical properties and impact resistance (IR). In addition, depending on each binder mass percentage, the mechanical properties of the produced concretes were evaluated by developing an optimized artificial neural network (ANN) combined with the genetic algorithm (GA) and compared with the available experimental test database. The mixes obtained using the DRTCs contents of 5–30% as fine or/and coarse aggregates substitution revealed satisfactory compressive strength suitable for practical applications. It is established that the incorporation of DRTCs as substitute component to the natural river sand or/and crushed gravel aggregates can largely improve the IR and ductility of the proposed concretes.

ACS Style

Akram M. Mhaya; Ghasan Fahim Huseien; Iman Faridmehr; Ahmad Razin Zainal Abidin; Rayed Alyousef; Mohammad Ismail. Evaluating mechanical properties and impact resistance of modified concrete containing ground Blast Furnace slag and discarded rubber tire crumbs. Construction and Building Materials 2021, 295, 123603 .

AMA Style

Akram M. Mhaya, Ghasan Fahim Huseien, Iman Faridmehr, Ahmad Razin Zainal Abidin, Rayed Alyousef, Mohammad Ismail. Evaluating mechanical properties and impact resistance of modified concrete containing ground Blast Furnace slag and discarded rubber tire crumbs. Construction and Building Materials. 2021; 295 ():123603.

Chicago/Turabian Style

Akram M. Mhaya; Ghasan Fahim Huseien; Iman Faridmehr; Ahmad Razin Zainal Abidin; Rayed Alyousef; Mohammad Ismail. 2021. "Evaluating mechanical properties and impact resistance of modified concrete containing ground Blast Furnace slag and discarded rubber tire crumbs." Construction and Building Materials 295, no. : 123603.

Journal article
Published: 05 May 2021 in Materials
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Eco-friendly and sustainable materials that are cost-effective, while having a reduced carbon footprint and energy consumption, are in great demand by the construction industry worldwide. Accordingly, alkali-activated materials (AAM) composed primarily of industrial byproducts have emerged as more desirable alternatives to ordinary Portland cement (OPC)-based concrete. Hence, this study investigates the cradle-to-gate life-cycle assessment (LCA) of ternary blended alkali-activated mortars made with industrial byproducts. Moreover, the embodied energy (EE), which represents an important parameter in cradle-to-gate life-cycle analysis, was investigated for 42 AAM mixtures. The boundary of the cradle-to-gate system was extended to include the mechanical and durability properties of AAMs on the basis of performance criteria. Using the experimental test database thus developed, an optimized artificial neural network (ANN) combined with the cuckoo optimization algorithm (COA) was developed to estimate the CO2 emissions and EE of AAMs. Considering the lack of systematic research on the cradle-to-gate LCA of AAMs in the literature, the results of this research provide new insights into the assessment of the environmental impact of AAM made with industrial byproducts. The final weight and bias values of the AAN model can be used to design AAM mixtures with targeted mechanical properties and CO2 emission considering desired amounts of industrial byproduct utilization in the mixture.

ACS Style

Iman Faridmehr; Moncef Nehdi; Mehdi Nikoo; Ghasan Huseien; Togay Ozbakkaloglu. Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts. Materials 2021, 14, 2401 .

AMA Style

Iman Faridmehr, Moncef Nehdi, Mehdi Nikoo, Ghasan Huseien, Togay Ozbakkaloglu. Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts. Materials. 2021; 14 (9):2401.

Chicago/Turabian Style

Iman Faridmehr; Moncef Nehdi; Mehdi Nikoo; Ghasan Huseien; Togay Ozbakkaloglu. 2021. "Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts." Materials 14, no. 9: 2401.

Journal article
Published: 11 April 2021 in Materials
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Recycling of the waste rubber tire crumbs (WRTCs) for the concretes production generated renewed interest worldwide. The insertion of such waste as a substitute for the natural aggregates in the concretes is an emergent trend for sustainable development towards building materials. Meanwhile, the enhanced resistance of the concrete structures against aggressive environments is important for durability, cost-saving, and sustainability. In this view, this research evaluated the performance of several modified rubberized concretes by exposing them to aggressive environments i.e., acid, and sulphate attacks, elevated temperatures. These concrete (12 batches) were made by replacing the cement and natural aggregate with an appropriate amount of the granulated blast furnace slag (GBFS) and WRTCs, respectively. The proposed mix designs’ performance was evaluated by several measures, including the residual compressive strength (CS), weight loss, ultrasonic pulse velocity (UPV), microstructures, etc. Besides, by using the available experimental test database, an optimized artificial neural network (ANN) combined with the particle swarm optimization (PSO) was developed to estimate the residual CS of modified rubberized concrete after immersion one year in MgSO4 and H2SO4 solutions. The results indicated that modified rubberized concrete prepared by 5 to 20% WRTCs as a substitute to natural aggregate, provided lower CS and weight lose expose to sulphate and acid attacks compared to control specimen prepared by ordinary Portland cement (OPC). Although the CS were slightly declined at the elevated temperature, these proposed mix designs have a high potential for a wide variety of concrete industrial applications, especially in acid and sulphate risk.

ACS Style

Akram M. Mhaya; Mohammad Baghban; Iman Faridmehr; Ghasan Huseien; Ahmad Abidin; Mohammad Ismail. Performance Evaluation of Modified Rubberized Concrete Exposed to Aggressive Environments. Materials 2021, 14, 1900 .

AMA Style

Akram M. Mhaya, Mohammad Baghban, Iman Faridmehr, Ghasan Huseien, Ahmad Abidin, Mohammad Ismail. Performance Evaluation of Modified Rubberized Concrete Exposed to Aggressive Environments. Materials. 2021; 14 (8):1900.

Chicago/Turabian Style

Akram M. Mhaya; Mohammad Baghban; Iman Faridmehr; Ghasan Huseien; Ahmad Abidin; Mohammad Ismail. 2021. "Performance Evaluation of Modified Rubberized Concrete Exposed to Aggressive Environments." Materials 14, no. 8: 1900.

Journal article
Published: 06 March 2021 in Materials
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This research investigated the application of epoxy resin polymer as a self-healing strategy for improving the mechanical and durability properties of cement-based mortar. The epoxy resin was added to the concrete mix at various levels (5, 10, 15, and 20% of cement weight), and the effectiveness of healing was evaluated by microstructural analysis, compressive strength, and non-destructive (ultrasonic pulse velocity) tests. Dry and wet-dry conditions were considered for curing, and for generating artificial cracks, specimens at different curing ages (1 and 6 months) were subjected to compressive testing (50 and 80% of specimen’s ultimate compressive strength). The results indicated that the mechanical properties in the specimen prepared by 10% epoxy resin and cured under wet-dry conditions was higher compared to other specimens. The degree of damage and healing efficiency index of this particular mix design were significantly affected by the healing duration and cracking age. An optimized artificial neural network (ANN) combined with a firefly algorithm was developed to estimate these indexes over the self-healing process. Overall, it was concluded that the epoxy resin polymer has high potential as a mechanical properties self-healing agent in cement-based mortar.

ACS Style

Ghasan Huseien; Abdul Sam; Iman Faridmehr; Mohammad Baghban. Performance of Epoxy Resin Polymer as Self-Healing Cementitious Materials Agent in Mortar. Materials 2021, 14, 1255 .

AMA Style

Ghasan Huseien, Abdul Sam, Iman Faridmehr, Mohammad Baghban. Performance of Epoxy Resin Polymer as Self-Healing Cementitious Materials Agent in Mortar. Materials. 2021; 14 (5):1255.

Chicago/Turabian Style

Ghasan Huseien; Abdul Sam; Iman Faridmehr; Mohammad Baghban. 2021. "Performance of Epoxy Resin Polymer as Self-Healing Cementitious Materials Agent in Mortar." Materials 14, no. 5: 1255.

Journal article
Published: 05 March 2021 in Applied Sciences
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Top and seat beam-to-column connections are commonly designed to transfer gravitational loads of simply supported steel beams. Nevertheless, the flexural resistance characteristics of these type of connections should be properly taken into account for design, when a reliable analysis of semi-rigid steel structures is desired. In this research paper, different component-based mechanical models from Eurocode 3 (EC3) and a literature proposal (by Kong and Kim, 2017) are considered to evaluate the initial stiffness (Sj,ini ) and ultimate moment capacity (Mn ) of top-seat angle connections with double web angles (TSACWs). An optimized artificial neural network (ANN) model based on the artificial bee colony (ABC) algorithm is proposed in this paper to acquire an informational model from the available literature database of experimental test measurements on TSACWs. In order to evaluate the expected effect of each input parameter (such as the thickness of top flange cleat, the bolt size, etc.) on the mechanical performance and overall moment–rotation (M–θ) response of the selected connections, a sensitivity analysis is presented. The collected comparative results prove the potential of the optimized ANN approach for TSACWs, as well as its accuracy and reliability for the prediction of the characteristic (M–θ) features of similar joints. For most of the examined configurations, higher accuracy is found from the ANN estimates, compared to Eurocode 3- or Kong et al.-based formulations.

ACS Style

Iman Faridmehr; Mehdi Nikoo; Raffaele Pucinotti; Chiara Bedon. Application of Component-Based Mechanical Models and Artificial Intelligence to Bolted Beam-to-Column Connections. Applied Sciences 2021, 11, 2297 .

AMA Style

Iman Faridmehr, Mehdi Nikoo, Raffaele Pucinotti, Chiara Bedon. Application of Component-Based Mechanical Models and Artificial Intelligence to Bolted Beam-to-Column Connections. Applied Sciences. 2021; 11 (5):2297.

Chicago/Turabian Style

Iman Faridmehr; Mehdi Nikoo; Raffaele Pucinotti; Chiara Bedon. 2021. "Application of Component-Based Mechanical Models and Artificial Intelligence to Bolted Beam-to-Column Connections." Applied Sciences 11, no. 5: 2297.

Journal article
Published: 14 February 2021 in Sustainability
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Alkali-activated products composed of industrial waste materials have shown promising environmentally friendly features with appropriate strength and durability. This study explores the mechanical properties and structural morphology of ternary blended alkali-activated mortars composed of industrial waste materials, including fly ash (FA), palm oil fly ash (POFA), waste ceramic powder (WCP), and granulated blast-furnace slag (GBFS). The effect on the mechanical properties of the Al2O3, SiO2, and CaO content of each binder is investigated in 42 engineered alkali-activated mixes (AAMs). The AAMs structural morphology is first explored with the aid of X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy measurements. Furthermore, three different algorithms are used to predict the AAMs mechanical properties. Both an optimized artificial neural network (ANN) combined with a metaheuristic Krill Herd algorithm (KHA-ANN) and an ANN-combined genetic algorithm (GA-ANN) are developed and compared with a multiple linear regression (MLR) model. The structural morphology tests confirm that the high GBFS volume in AAMs results in a high volume of hydration products and significantly improves the final mechanical properties. However, increasing POFA and WCP percentage in AAMs manifests in the rise of unreacted silicate and reduces C-S-H products that negatively affect the observed mechanical properties. Meanwhile, the mechanical features in AAMs with high-volume FA are significantly dependent on the GBFS percentage in the binder mass. It is also shown that the proposed KHA-ANN model offers satisfactory results of mechanical property predictions for AAMs, with higher accuracy than the GA-ANN or MLR methods. The final weight and bias values given by the model suggest that the KHA-ANN method can be efficiently used to design AAMs with targeted mechanical features and desired amounts of waste consumption.

ACS Style

Iman Faridmehr; Chiara Bedon; Ghasan Huseien; Mehdi Nikoo; Mohammad Baghban. Assessment of Mechanical Properties and Structural Morphology of Alkali-Activated Mortars with Industrial Waste Materials. Sustainability 2021, 13, 2062 .

AMA Style

Iman Faridmehr, Chiara Bedon, Ghasan Huseien, Mehdi Nikoo, Mohammad Baghban. Assessment of Mechanical Properties and Structural Morphology of Alkali-Activated Mortars with Industrial Waste Materials. Sustainability. 2021; 13 (4):2062.

Chicago/Turabian Style

Iman Faridmehr; Chiara Bedon; Ghasan Huseien; Mehdi Nikoo; Mohammad Baghban. 2021. "Assessment of Mechanical Properties and Structural Morphology of Alkali-Activated Mortars with Industrial Waste Materials." Sustainability 13, no. 4: 2062.

Journal article
Published: 15 September 2020 in Materials
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Currently, alkali-activated binders using industrial wastes are considered an environmentally friendly alternative to ordinary Portland cement (OPC), which contributes to addressing the high levels of carbon dioxide (CO2) emissions and enlarging embodied energy (EE). Concretes produced from industrial wastes have shown promising environmentally-friendly features with appropriate strength and durability. From this perspective, the compressive strength (CS), CO2 emissions, and EE of four industrial powder waste materials, including fly ash (FA), palm oil fly ash (POFA), waste ceramic powder (WCP), and granulated blast-furnace slag (GBFS), were investigated as replacements for OPC. Forty-two engineered alkali-activated mix (AAM) designs with different percentages of the above-mentioned waste materials were experimentally investigated to evaluate the effect of each binder mass percentage on 28-day CS. Additionally, the effects of each industrial powder waste material on SiO2, CaO, and Al2O3 contents were investigated. The results confirm that adding FA to the samples caused a reduction of less than 26% in CS, whereas the replacement of GBFS by different levels of POFA significantly affected the compressive strength of specimens. The results also show that the AAM designs with a high volume FA provided the lowest EE and CO2 emission levels compared to other mix designs. Empirical equations were also proposed to estimate the CS, CO2 emissions, and EE of AAM designs according to their binder mass compositions.

ACS Style

Iman Faridmehr; Ghasan Fahim Huseien; Mohammad Hajmohammadian Baghban. Evaluation of Mechanical and Environmental Properties of Engineered Alkali-Activated Green Mortar. Materials 2020, 13, 4098 .

AMA Style

Iman Faridmehr, Ghasan Fahim Huseien, Mohammad Hajmohammadian Baghban. Evaluation of Mechanical and Environmental Properties of Engineered Alkali-Activated Green Mortar. Materials. 2020; 13 (18):4098.

Chicago/Turabian Style

Iman Faridmehr; Ghasan Fahim Huseien; Mohammad Hajmohammadian Baghban. 2020. "Evaluation of Mechanical and Environmental Properties of Engineered Alkali-Activated Green Mortar." Materials 13, no. 18: 4098.

Case report
Published: 29 August 2020 in Water
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Maintaining the reservoir safety of large dams has considerable importance for the public where they are constructed in heavily populated and industrialized areas. The extreme hydrodynamic force caused by ground acceleration, cavitation damage, and vibration are among concerns that threaten the safety of the spillway and its conveyance structures when subjected to a natural disaster, such as earthquakes and severe floods. Current research investigates the hydrostatic and hydrodynamic performance of the Karkheh Dam spillway radial gate through 3-D finite element (FE) models using ABAQUS/Explicit. The common loads applied on the radial gate were reviewed and stress–strain in the skin plate and trunnion were investigated as a result of developed hydrodynamic pressures. The performance of conveyance structures subjected to significant discharge was also investigated through a small-scale model to evaluate the cavitation damage index. The results of this research will help researchers in the field of civil and hydraulic engineering for the risk analysis of the radial gates and conveyance structures.

ACS Style

Iman Faridmehr; Ali Farokhi Nejad; Mohammad Hajmohammadian Baghban; Reza Ghorbani. Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance. Water 2020, 12, 2425 .

AMA Style

Iman Faridmehr, Ali Farokhi Nejad, Mohammad Hajmohammadian Baghban, Reza Ghorbani. Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance. Water. 2020; 12 (9):2425.

Chicago/Turabian Style

Iman Faridmehr; Ali Farokhi Nejad; Mohammad Hajmohammadian Baghban; Reza Ghorbani. 2020. "Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance." Water 12, no. 9: 2425.

Review
Published: 29 August 2020 in Applied Sciences
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Local failure of one or more components due to abnormal loading can induce the progressive collapse of a building structure. In this study, by the aid of available full-scale test results on double-span systems subjected to the middle column loss scenario, an extensive parametric study was performed to investigate the effects of different design parameters on progressive collapse performance of beam-to-column connections, i.e., beam span-to-depth ratio, catenary mechanism, and connection robustness. The selected full-scale double-span assemblies consisted of fully rigid (welded flange-welded web, SidePlate), semi-rigid (flush end-plate, extended end-plate), and flexible connections (top and seat angle, web cleat). The test results, including load-deformation responses, development of the catenary mechanism, and connection robustness, are presented in detail. The finding of this research further enables a comprehensive comparison between different types of steel beam-to-column connections since the effects of span-to-depth ratio and beam sections were filtered out.

ACS Style

Iman Faridmehr; Mohammad Hajmohammadian Baghban. An Overview of Progressive Collapse Behavior of Steel Beam-to-Column Connections. Applied Sciences 2020, 10, 6003 .

AMA Style

Iman Faridmehr, Mohammad Hajmohammadian Baghban. An Overview of Progressive Collapse Behavior of Steel Beam-to-Column Connections. Applied Sciences. 2020; 10 (17):6003.

Chicago/Turabian Style

Iman Faridmehr; Mohammad Hajmohammadian Baghban. 2020. "An Overview of Progressive Collapse Behavior of Steel Beam-to-Column Connections." Applied Sciences 10, no. 17: 6003.

Journal article
Published: 01 December 2019 in Studia Geotechnica et Mechanica
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Water seepage is one of the most important features of embankment dams. To prevent and reduce seepage, it is necessary to seal the dam. Plastic concrete cutoff walls are one of the most efficient methods in waterproofing the foundation of embankment dams on permeable alluvial substrates. Sufficient resistance to loads, low permeability to maintain dam sealing, high ductility compatible with the foundation and deformation under load without cracking are the main requirements in plastic concrete cutoff walls. In this paper, the construction and implementation of the cutoff wall of Karkheh Dam, which is one the world’s largest water sealing projects, was studied. In addition, a numerical model using Seep-3D software was developed to evaluate the efficiency of the cut-off wall to decrease the seepage over the dam’s foundation. The numerical results validated by instrumentation statistics resulted from 17-years dam operation. According to the results, after the drainage of the reservoir, the cutoff wall optimally reduced the hydraulic gradient by 0.08 from 2.35 and the water leakage by 3.1 m/s from 18.3 m/s.

ACS Style

Iman Faridmehr; Mohammad Reza YazdaniPour; Mohammad Javadi Jokar; Togay Ozbakkaloglu. Construction and Monitoring of Cement/Bentonite Cutoff Walls: Case Study of Karkheh Dam, Iran. Studia Geotechnica et Mechanica 2019, 41, 184 -199.

AMA Style

Iman Faridmehr, Mohammad Reza YazdaniPour, Mohammad Javadi Jokar, Togay Ozbakkaloglu. Construction and Monitoring of Cement/Bentonite Cutoff Walls: Case Study of Karkheh Dam, Iran. Studia Geotechnica et Mechanica. 2019; 41 (4):184-199.

Chicago/Turabian Style

Iman Faridmehr; Mohammad Reza YazdaniPour; Mohammad Javadi Jokar; Togay Ozbakkaloglu. 2019. "Construction and Monitoring of Cement/Bentonite Cutoff Walls: Case Study of Karkheh Dam, Iran." Studia Geotechnica et Mechanica 41, no. 4: 184-199.

Article
Published: 21 October 2019 in International Journal of Steel Structures
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A test program was considered to clarify the cyclic characteristics of eight full-scale unstiffened extended end-plates with variable parameters and one SidePlate moment connection. All specimens were subjected to 2010 AISC seismic provision loading protocol where flexural strengths were identified at each interstorey drift angle. The results showed that all unstiffened extended end-plate failed to develop full inelastic capacity of connected beams and plastic hinges mainly appeared in the connection’s components. On the other hand, the SidePlate moment connection had the capacity to develop adequate interstorey drift angles up to 0.06 rad, indicating that this type of connection possesses sufficient stiffness and strength to be classified as a rigid and full-strength connection. The results also showed that SidePlate possesses considerably more energy dissipation capacity and an equivalent hysteretic damping ratio compared to unstiffened extended end-plate specimens, especially at higher interstorey drift angles.

ACS Style

Iman Faridmehr; Mamood Md. Tahir; Mohd Hanim Osman; MohammadAmin Azimi. Cyclic Behaviour of Fully-Rigid and Semi-Rigid Steel Beam-to-Column Connections. International Journal of Steel Structures 2019, 20, 365 -385.

AMA Style

Iman Faridmehr, Mamood Md. Tahir, Mohd Hanim Osman, MohammadAmin Azimi. Cyclic Behaviour of Fully-Rigid and Semi-Rigid Steel Beam-to-Column Connections. International Journal of Steel Structures. 2019; 20 (2):365-385.

Chicago/Turabian Style

Iman Faridmehr; Mamood Md. Tahir; Mohd Hanim Osman; MohammadAmin Azimi. 2019. "Cyclic Behaviour of Fully-Rigid and Semi-Rigid Steel Beam-to-Column Connections." International Journal of Steel Structures 20, no. 2: 365-385.

Journal article
Published: 05 January 2018 in American Journal of Civil Engineering and Architecture
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The present study attempts to determine the main characteristics of a new proposed steel connection retrofitted by an elastomeric isolator. Its stiffness, strength, and ductility are investigated. The elastomeric isolators were designed according to the Japanese Society of Base Isolation with the aim of improving the energy dissipation of the connection. Experimental tests were conducted to evaluate the moment rotation (M-θ) curve of the proposed connection as well as of fully-rigid (SidePlate) and semi-rigid (flush end-plate) connections. The behaviour of beams with flexible and fixed-end connections was also studied by classical methods of analysis. The initial stiffness and classification index of the connections were identified by an analytical calculation in compliance with the methods suggested by Eurocode 3 Part 1-8 and ANSI/AISC 360-10. The results confirmed that the new proposed connection can be classified as a flexible connection in terms of its initial stiffness; however, it developed 90% of the plastic moment capacity of a connected beam. Besides, it showed that the isolated connection did address the AISC drift angle capacity requirement of θSD for a special moment frame (SMF).

ACS Style

Iman Faridmehr; Mahmood Md. Tahir; Mohd Hanim Osman; Abbas Razavykia. Structural Performance of Isolated Steel Beam-to-Column Connection. American Journal of Civil Engineering and Architecture 2018, 6, 68 -79.

AMA Style

Iman Faridmehr, Mahmood Md. Tahir, Mohd Hanim Osman, Abbas Razavykia. Structural Performance of Isolated Steel Beam-to-Column Connection. American Journal of Civil Engineering and Architecture. 2018; 6 (2):68-79.

Chicago/Turabian Style

Iman Faridmehr; Mahmood Md. Tahir; Mohd Hanim Osman; Abbas Razavykia. 2018. "Structural Performance of Isolated Steel Beam-to-Column Connection." American Journal of Civil Engineering and Architecture 6, no. 2: 68-79.

Research article
Published: 30 April 2017 in Journal of Engineering
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The nonlinear stiffness matrix method was incorporated to investigate the structural performance of steel portal frames with semirigid connections. A portal frame with unstiffened extended end-plate connection was designed to demonstrate the adequacy of the proposed method. Besides, the seismic performance of steel portal frames with semirigid connections was investigated through time history analysis where kinematic hysteresis model was assigned to semirigid connections to account for energy dissipation and unloading stiffness. Based on the results of the study, it was found that generally semirigid connections influenced the force distribution which resulted in the decrease in base shear and lighter frame compared to the rigid one. The results also indicated that there was no direct relationship between maximum displacement at the top and connection stiffness in high-rise frames.

ACS Style

Iman Faridmehr; Mahmood Md. Tahir; Tom Lahmer; Mohd Hanim Osman. Seismic Performance of Steel Frames with Semirigid Connections. Journal of Engineering 2017, 2017, 1 -10.

AMA Style

Iman Faridmehr, Mahmood Md. Tahir, Tom Lahmer, Mohd Hanim Osman. Seismic Performance of Steel Frames with Semirigid Connections. Journal of Engineering. 2017; 2017 ():1-10.

Chicago/Turabian Style

Iman Faridmehr; Mahmood Md. Tahir; Tom Lahmer; Mohd Hanim Osman. 2017. "Seismic Performance of Steel Frames with Semirigid Connections." Journal of Engineering 2017, no. : 1-10.

Articles
Published: 01 November 2016 in Latin American Journal of Solids and Structures
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The current study attempts to recognise an adequate classification for a semi-rigid beam-to-column connection by investigating strength, stiffness and ductility. For this purpose, an experimental test was carried out to investigate the moment-rotation (M-θ) features of flush end-plate (FEP) connections including variable parameters like size and number of bolts, thickness of end-plate, and finally, size of beams and columns. The initial elastic stiffness and ultimate moment capacity of connections were determined by an extensive analytical procedure from the proposed method prescribed by ANSI/AISC 360-10, and Eurocode 3 Part 1-8 specifications. The behaviour of beams with partially restrained or semi-rigid connections were also studied by incorporating classical analysis methods. The results confirmed that thickness of the column flange and end-plate substantially govern over the initial rotational stiffness of of flush end-plate connections. The results also clearly showed that EC3 provided a more reliable classification index for flush end-plate (FEP) connections. The findings from this study make significant contributions to the current literature as the actual response characteristics of such connections are non-linear. Therefore, such semi-rigid behaviour should be used to for an analysis and design method.

ACS Style

Iman Faridmehr; Mamood Md. Tahir; Tom Lahmer. Classification System for Semi-Rigid Beam-to-Column Connections. Latin American Journal of Solids and Structures 2016, 13, 2152 -2175.

AMA Style

Iman Faridmehr, Mamood Md. Tahir, Tom Lahmer. Classification System for Semi-Rigid Beam-to-Column Connections. Latin American Journal of Solids and Structures. 2016; 13 (11):2152-2175.

Chicago/Turabian Style

Iman Faridmehr; Mamood Md. Tahir; Tom Lahmer. 2016. "Classification System for Semi-Rigid Beam-to-Column Connections." Latin American Journal of Solids and Structures 13, no. 11: 2152-2175.

Journal article
Published: 30 June 2016 in International Journal of Steel Structures
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This paper presents an experimental, analytical and numerical investigation on the correlation between non-dimensional slenderness and pure bending strength of stiffened cold-formed steel as a construction material. Cover plates with three different thicknesses (1.6, 2 and 4 mm) were incorporated to evaluate the slenderness effects on flexural performance of C-sections installed at top flanges only as it would be the predicted location for local and distortional buckling. The lateral supports were provided to prevent lateral torsional buckling in the experiment investigation. Application of the Direct Strength Method led to an extensive parametric study to investigate the moment capacity and buckling modes of specimens with different cover plate thicknesses. A nonlinear finite element model was developed and verified against the test results in terms of failure buckling modes. Moreover, a newly recommended non-dimensional slenderness of DSM in order to address the plastic strength for stocky sections was proposed in this paper. The results explicitly showed that the cover plate reduced the non-dimensional slenderness which resulted in improved buckling capacity. Also, it was concluded that the design strengths predicted by the current DSM in accordance with the American specification guideline, AISI, was conservative for sturdy sections as these sections can develop plastic moment.

ACS Style

Iman Faridmehr; Mohd Hanim Osman; Mahmood Md. Tahir; MohammadAmin Azimi; Mehran Gholami. Behaviour and design of cold-formed steel C-sections with cover plates under bending. International Journal of Steel Structures 2016, 16, 587 -600.

AMA Style

Iman Faridmehr, Mohd Hanim Osman, Mahmood Md. Tahir, MohammadAmin Azimi, Mehran Gholami. Behaviour and design of cold-formed steel C-sections with cover plates under bending. International Journal of Steel Structures. 2016; 16 (2):587-600.

Chicago/Turabian Style

Iman Faridmehr; Mohd Hanim Osman; Mahmood Md. Tahir; MohammadAmin Azimi; Mehran Gholami. 2016. "Behaviour and design of cold-formed steel C-sections with cover plates under bending." International Journal of Steel Structures 16, no. 2: 587-600.

Journal article
Published: 01 June 2016 in Latin American Journal of Solids and Structures
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ACS Style

Iman Faridmehr; Mohd Hanim Osman; Mamood Md. Tahir; Abbas Razavykia; Ali Farokhi Nejad. Effect of Web Holes and Bearing Stiffeners on Flexural-Shear Interaction Strength of Steel Cold-Formed C-Channel Sections. Latin American Journal of Solids and Structures 2016, 13, 1152 -1166.

AMA Style

Iman Faridmehr, Mohd Hanim Osman, Mamood Md. Tahir, Abbas Razavykia, Ali Farokhi Nejad. Effect of Web Holes and Bearing Stiffeners on Flexural-Shear Interaction Strength of Steel Cold-Formed C-Channel Sections. Latin American Journal of Solids and Structures. 2016; 13 (6):1152-1166.

Chicago/Turabian Style

Iman Faridmehr; Mohd Hanim Osman; Mamood Md. Tahir; Abbas Razavykia; Ali Farokhi Nejad. 2016. "Effect of Web Holes and Bearing Stiffeners on Flexural-Shear Interaction Strength of Steel Cold-Formed C-Channel Sections." Latin American Journal of Solids and Structures 13, no. 6: 1152-1166.

Journal article
Published: 10 April 2016 in Steel and Composite Structures
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ACS Style

M. Gholami; A.R. Mohd Sam; A.K. Marsono; M.M. Tahir; Iman Faridmehr. Performance of steel beams strengthened with pultruded CFRP plate under various exposures. Steel and Composite Structures 2016, 20, 999 -1022.

AMA Style

M. Gholami, A.R. Mohd Sam, A.K. Marsono, M.M. Tahir, Iman Faridmehr. Performance of steel beams strengthened with pultruded CFRP plate under various exposures. Steel and Composite Structures. 2016; 20 (5):999-1022.

Chicago/Turabian Style

M. Gholami; A.R. Mohd Sam; A.K. Marsono; M.M. Tahir; Iman Faridmehr. 2016. "Performance of steel beams strengthened with pultruded CFRP plate under various exposures." Steel and Composite Structures 20, no. 5: 999-1022.

Research article
Published: 04 January 2016 in Advances in Civil Engineering
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The behaviour of a novel steel beam-to-column connection, the saddlebag, subjected to cyclic and progressive collapse, was evaluated in this paper. The cyclic behaviour considered the interstory drift angle and flexural strength in accordance with 2010 AISC Seismic Provisions, while progressive collapse assessment was evaluated through the plastic hinge rotation angle based on acceptance criteria provided in the UFC 4-023-03 guideline. From the cyclic test, one complete cycle of an interstory drift angle of 0.06 rad was satisfied for the saddlebag connection, which is an indication of the effectiveness in accordance with 2010 AISC Seismic Provisions. Besides, the new proposed connection developed adequate catenary action, which is a fundamental criterion to resist against progressive collapse. The resulting fuller hysteretic loops with large energy dissipation capacity in the proposed saddlebag connection guarantee its ability to address the inelastic deformation demands in earthquake conditions.

ACS Style

Iman Faridmehr; Yusof Ahmad; Mahmood Md. Tahir; Mohd Hanim Osman. Cyclic and Explosive Evaluation of New Proposed Steel Joint. Advances in Civil Engineering 2016, 2016, 1 -11.

AMA Style

Iman Faridmehr, Yusof Ahmad, Mahmood Md. Tahir, Mohd Hanim Osman. Cyclic and Explosive Evaluation of New Proposed Steel Joint. Advances in Civil Engineering. 2016; 2016 ():1-11.

Chicago/Turabian Style

Iman Faridmehr; Yusof Ahmad; Mahmood Md. Tahir; Mohd Hanim Osman. 2016. "Cyclic and Explosive Evaluation of New Proposed Steel Joint." Advances in Civil Engineering 2016, no. : 1-11.