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Hani Salim
Civil and Environmental Engineering Department, University of Missouri-Columbia, Columbia, MO 65211, USA

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Journal article
Published: 29 August 2021 in Engineering Structures
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The monotonic behavior of externally post-tensioned steel–concrete composite girders was numerically studied in this paper. A three-dimensional numerical model was developed and validated using experimental test results that were conducted by the authors and using an existing analytical model. A parametric study using this validated numerical model was performed to investigate the effects of various parameters on the monotonic performance of composite girders strengthened with external post-tensioned tendons. The parameters investigated include variations in the degree of shear connection, layout and diameter of shear connectors, the initial post-tensioning force, the depth of the steel beam, the eccentricity of the tendons, the compressive strength of concrete, and the shear capacity of the studs. The numerical model provided a better understanding of the effect of these parameters on the behavior of the strengthened beams. The results of the parametric study show that as the degree of shear connection decreased, the stud strains increased and the slippage between the concrete deck and steel beam increased. As the full degree of shear connection was reduced to 80%, 60%, and 40%, the stud strains were increased by 20%, 46%, and 94%, respectively. Also, as the shear connection degree decreases, its effect on the slippage behavior increases. As the degree of shear connection was reduced to 80%, 60%, and 40%, the slippage values were increased by 23%, 48%, and 102%, respectively. The study also shows that, for the same degree of shear connection, beams with one row of shear studs had up to 10% higher flexural capacity than beams with two rows of studs. A 100% increase in the stud diameter caused a 28% reduction in the ultimate load capacity and a 160% increase in the maximum slippage. The higher the post-tensioning force, the higher the ultimate load capacity and the lower the tensile strains in the steel beam. A 118% increase in the post-tensioning force resulted in a 9% increase in the ultimate load capacity and a 13% reduction in the tensile strains. Increasing the depth of the steel beam by 40% resulted in a reduction in the tensile strains at midspan by 20%. The lowest midspan tensile strains were obtained from the combination of increasing the depth of the steel beam and tendon eccentricity.

ACS Style

Fahad Alsharari; Ayman El-Zohairy; Hani Salim; Alaa El-Din El-Sisi. Numerical investigation of the monotonic behavior of strengthened Steel-Concrete composite girders. Engineering Structures 2021, 246, 113081 .

AMA Style

Fahad Alsharari, Ayman El-Zohairy, Hani Salim, Alaa El-Din El-Sisi. Numerical investigation of the monotonic behavior of strengthened Steel-Concrete composite girders. Engineering Structures. 2021; 246 ():113081.

Chicago/Turabian Style

Fahad Alsharari; Ayman El-Zohairy; Hani Salim; Alaa El-Din El-Sisi. 2021. "Numerical investigation of the monotonic behavior of strengthened Steel-Concrete composite girders." Engineering Structures 246, no. : 113081.

Journal article
Published: 26 July 2021 in Structures
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This paper investigates the long-term response of reinforced concrete (RC) beams strengthened with CFRP subjected to sustained static loads. The beams were strengthened using two different configurations of CFRP with different steel reinforcement ratios and web reinforcement. Two RC beams and five CFRP-RC beams were evaluated under static short-term bending, and five additional CFRP-RC beams were evaluated under sustained loads for 332 days. The sustained loads were maintained at around 60% of the static capacity of the beams strengthened with CFRP. The residual strength of the CFRP-RC beams after long-term creep testing was evaluated experimentally under static loads to failure. CFRP sheets were attached to the transverse and tension faces of the beams. The test results show that CFRP strengthening of beams is effective in enhancing their static capacities. The residual strength of the long-term creep-tested beams was 5–18% lower than the strength of the short-term beams except for the steel over-reinforced beam. In addition, the residual stiffness did not change significantly. However, the residual toughness was 22% to 64% of the toughness of the short-term beams due to creep damage. The web steel reinforcement played an important role in improving the overall performance and failure mode of the strengthened beams.

ACS Style

Ayssar Al-Khafaji; Hani Salim; Alaa El-Sisi. Behavior of RC beams strengthened with CFRP sheets under sustained loads. Structures 2021, 33, 4690 -4700.

AMA Style

Ayssar Al-Khafaji, Hani Salim, Alaa El-Sisi. Behavior of RC beams strengthened with CFRP sheets under sustained loads. Structures. 2021; 33 ():4690-4700.

Chicago/Turabian Style

Ayssar Al-Khafaji; Hani Salim; Alaa El-Sisi. 2021. "Behavior of RC beams strengthened with CFRP sheets under sustained loads." Structures 33, no. : 4690-4700.

Journal article
Published: 22 June 2021 in Construction and Building Materials
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During a blast event, the polymeric interlayer of laminated glass used in windows and curtain walls plays an essential role in protecting buildings and occupants. In this research, the dynamic constitutive behavior of ultraviolet (UV) cured one-component acrylic resin (UVEKOL-S), Polyvinyl butyral (PVB), and virgin PVB extracted from heat strengthened laminated glass panes were investigated at an average strain rate of 30–40 s−1 using impact drop-weight apparatus. An analytical procedure was developed to simulate the drop weight device and calculate the drop height required for a certain strain rate. A new technique was used to investigate the mechanical properties of PVB, and UVEKOL-S before and after the breakage of the laminated glass, including each material energy absorption capacity. The results show that both PVB and UVEKOL-S, at strain rates of 30–40 s−1, had an initial rise in strength. However, after the maximum stress point, both materials followed a noticeable difference in their response to failure. Comparing the high-strain and static results showed that the dynamic loading significantly affects the material response and the energy absorption characteristics of the interlayer materials, and subsequently, the blast response of laminated glass panels. Sufficient data was obtained from the tests to evaluate alternative approaches to modeling PVB and UVEKOL-S materials in the blast event.

ACS Style

Mahmoud Nawar; Hani Salim; Michael Newberry; Alaa El-Sisi. High strain rate response of laminated glass interlayer materials. Construction and Building Materials 2021, 299, 123934 .

AMA Style

Mahmoud Nawar, Hani Salim, Michael Newberry, Alaa El-Sisi. High strain rate response of laminated glass interlayer materials. Construction and Building Materials. 2021; 299 ():123934.

Chicago/Turabian Style

Mahmoud Nawar; Hani Salim; Michael Newberry; Alaa El-Sisi. 2021. "High strain rate response of laminated glass interlayer materials." Construction and Building Materials 299, no. : 123934.

Journal article
Published: 24 April 2021 in Structures
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Fingerplate expansion devices are commonly used to account for movements and rotations of two bridge deck slabs. Under high traffic volumes, these devices experience premature damage that affects the structural integrity of the bridge superstructure. In this paper, a group of experimental tests and 3D elastic–plastic finite element models (FEMs) were conducted to study the structural behavior and modes of failure of this type of joints. The experimental results were also used to validate the FEMs, from which additional FEM models were employed to study the effects of various design parameters. The parametric study results showed that the finger thickness did not influence the response in the absence of stiffeners. On the other hand, the presence of stiffeners increased the finger joint stiffness while decreased the device ductility. Welding zones were the sites of crack initiation in most of the studied cases. The numerical results showed that the locations of the highest stress concentrations were in the weld between the fingerplate and the supporting beam top flange and in the weld between the stiffeners and the top flange.

ACS Style

Mohammed Mutnbak; Hani Salim; Alaa El-Din El-Sisi. Quasi-static strength of bridge fingerplates under various design parameters. Structures 2021, 32, 2161 -2173.

AMA Style

Mohammed Mutnbak, Hani Salim, Alaa El-Din El-Sisi. Quasi-static strength of bridge fingerplates under various design parameters. Structures. 2021; 32 ():2161-2173.

Chicago/Turabian Style

Mohammed Mutnbak; Hani Salim; Alaa El-Din El-Sisi. 2021. "Quasi-static strength of bridge fingerplates under various design parameters." Structures 32, no. : 2161-2173.

Journal article
Published: 25 March 2021 in Structures
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Steel-concrete composite beams in highway bridges are susceptible to various types of damage during their service life. These damages can greatly affect the structural performance and shorten the fatigue life of bridges. The efficacy of adding external post-tensioning, as a strengthening technique, to steel–concrete composite beams that are subjected to fatigue loading is not well investigated. Therefore, this study includes fatigue testing of post-tensioned steel–concrete composite beams with various types of pre-damage. Three of the tested samples were subjected to outdoor environmental changes, cyclic preloading, and static overloading as pre-damages before applying the external post-tensioning. The strengthened samples were exposed to fatigue tests to a million cycles under four-point bending. Samples without pre-damage were tested as references to those with pre-damages. The crack patterns in the concrete decks were evaluated during these tests. Static tests to failure were performed to explore the residual capacities, deformations, and strains of all fatigued samples. The crack patterns in concrete decks were significantly affected by the type of pre-damage that was applied before the post-tensioning. The static overloading pre-damage reduced the number of cracks and their rate of propagation while the exposure to outdoor environment pre-damage induced more cracks, which negatively affected the crack patterns during fatigue loading. Subjecting the sample to plastic deformation pre-damage slightly improved its performance in terms of residual stiffness and ultimate load. The residual ultimate load was increased by 7% relative to the fatigued sample without pre-damage. However, the ductility was reduced by 40% due to the initial plastic deformation. This reduction in ductility was combined with a decrease in the interface slippage between the concrete deck and steel flange.

ACS Style

Fahad Alsharari; Ayman El-Zohairy; Hani Salim; Alaa El-Din El-Sisi. Pre-damage effect on the residual behavior of externally post-tensioned fatigued steel-concrete composite beams. Structures 2021, 32, 578 -587.

AMA Style

Fahad Alsharari, Ayman El-Zohairy, Hani Salim, Alaa El-Din El-Sisi. Pre-damage effect on the residual behavior of externally post-tensioned fatigued steel-concrete composite beams. Structures. 2021; 32 ():578-587.

Chicago/Turabian Style

Fahad Alsharari; Ayman El-Zohairy; Hani Salim; Alaa El-Din El-Sisi. 2021. "Pre-damage effect on the residual behavior of externally post-tensioned fatigued steel-concrete composite beams." Structures 32, no. : 578-587.

Journal article
Published: 16 January 2021 in Engineering Structures
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The use of cold-formed steel trusses in roof framing has significantly increased recently. Cold-formed steel roof trusses are ideal and efficient systems for a variety of applications due to their design flexibility and ease of construction. Past research explored the behavior of these truss systems up to the ultimate capacity point; however, the inelastic behavior to the failure was not fully captured. Information about the response beyond the buckling point and the energy absorption capacities are missing and need to be investigated. In this paper, small-scale cold-formed steel roof truss specimens were tested to failure under quasi-static loading. The static resistance of these systems and the associated failure mechanisms were identified. Such information is key input when analyzing these roof systems under blast loads using the Single Degree of Freedom simplified technique. Experimental results and absorbed energy comparisons show that the truss layout and the shape of loading significantly affect the performance of the truss and the failure mechanism. Three-dimensional finite element models were developed and verified against the experimental results. The advanced models predicted the static resistance with a high level of accuracy. Experimental and finite element analyses have shown that the energy absorbed is improved significantly when the web members susceptible to buckling are strengthened.

ACS Style

Doaa Bondok; Hani Salim; Girum Urgessa. Quasi-static responses and associated failure mechanisms of cold-formed steel roof trusses. Engineering Structures 2021, 231, 111741 .

AMA Style

Doaa Bondok, Hani Salim, Girum Urgessa. Quasi-static responses and associated failure mechanisms of cold-formed steel roof trusses. Engineering Structures. 2021; 231 ():111741.

Chicago/Turabian Style

Doaa Bondok; Hani Salim; Girum Urgessa. 2021. "Quasi-static responses and associated failure mechanisms of cold-formed steel roof trusses." Engineering Structures 231, no. : 111741.

Journal article
Published: 20 June 2020 in Fibers
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In this paper, experimental investigations for strengthening reinforced concrete (RC) continuous beams were performed. Eighteen T-beams were cast, twelve of which were inverted T-beams where the flange portion of the T-beam was subjected to positive flexure to represent the support region of a continuous beam. Six of the T-beams were non-inverted where the web is subjected to positive flexure. Carbon fiber reinforced polymer (CFRP) sheets with different widths were considered, and different strengthening configurations with the same area of CFRP were investigated. The use of one-layer, multiple layers, or multiple strips of CFRP were evaluated to investigate the effect of these configurations on the ultimate capacity and ductility of the strengthened beams. From the experimental observation of the non-inverted beams, it was found that the ultimate load capacities of the CFRP-strengthened beams were enhanced by 4% to 90% compared to the control beam. Using multiple layers of CFRP sheets enhanced the stiffness of the beams by 4% to 46%, depending on the CFRP area and configurations. The debonding of CFRP before the ultimate failure provided additional ductility to the tested beams. For the strengthening of the inverted beams, it was found that the addition of CFRP strips did not increase the strength of the beams when the width of CFRP to beam width ratio was less than 0.25, but the ductility of the beam was enhanced slightly. The use of multiple strips was found to be a more effective way for the strengthening of the negative moment region than using multiple layers. This can also provide more desirable modes of failure than when applying CFRP in multiple layers. Ductility was found to be lower if multiple layers were used compared to other configurations. Moreover, it was observed that as the compressive strength of concrete increased the addition of the CFRP improved the beams ductility.

ACS Style

Ayssar Al-Khafaji; Hani Salim. Flexural Strengthening of RC Continuous T-Beams Using CFRP. Fibers 2020, 8, 41 .

AMA Style

Ayssar Al-Khafaji, Hani Salim. Flexural Strengthening of RC Continuous T-Beams Using CFRP. Fibers. 2020; 8 (6):41.

Chicago/Turabian Style

Ayssar Al-Khafaji; Hani Salim. 2020. "Flexural Strengthening of RC Continuous T-Beams Using CFRP." Fibers 8, no. 6: 41.

Journal article
Published: 30 April 2020 in Engineering Structures
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In bolted composite connections design, staggered arrangements might offer a good area usage especially for structural elements with a small width. In this research, experimental and numerical works were employed to study the composite-steel double lapped joints with staggered bolts arrangement under static loads. Staggered bolt arrangement was studied with different bolt diameters and numbers. The predictions of developed models were compared to the experimental results and a good correlation was evaluated. The experimental study shows that the side distance in the staggered bolted joint has a significant influence on the maximum load due to the out-of-plane rotation. Simulation of the experimental work shows that this out-of-plane rotation produces a horizontal force on the direction causing early failure for the joint. A parametric study was performed to investigate the effect of bolt numbers and diameters. It was found that the number of bolts has a more significant effect on increasing joint failure load than the bolt diameter. In all cases, the first bolt from the composite plate side has the maximum force, therefore, the first damage happened under this bolt. Considering the axial applied load direction as a reference direction, high perpendicular to parallel forces ratio was evaluated on the bolts of the staggered joint. It is recommended to consider this force during the design of the laminate. Furthermore, the staggered bolt arrangement was found to cause a significant out-of-plane bending which is recommended to be taken into consideration.

ACS Style

Alaa El-Din A. El-Sisi; Hesham M. El-Emam; Hani A. Salim; Hossam El-Din Sallam. Deformation and load transfer analysis of staggered composite-steel lap joints subjected to progressive damage. Engineering Structures 2020, 215, 110690 .

AMA Style

Alaa El-Din A. El-Sisi, Hesham M. El-Emam, Hani A. Salim, Hossam El-Din Sallam. Deformation and load transfer analysis of staggered composite-steel lap joints subjected to progressive damage. Engineering Structures. 2020; 215 ():110690.

Chicago/Turabian Style

Alaa El-Din A. El-Sisi; Hesham M. El-Emam; Hani A. Salim; Hossam El-Din Sallam. 2020. "Deformation and load transfer analysis of staggered composite-steel lap joints subjected to progressive damage." Engineering Structures 215, no. : 110690.

Journal article
Published: 01 April 2019 in Journal of Performance of Constructed Facilities
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Various ductile sheet materials are currently being considered to retrofit existing concrete walls to mitigate the effects of external blast. In this paper, the blast mitigation of the soft and rigid sheet retrofit systems of reinforced concrete walls is studied. Different types of thin sheet retrofits, such as steel, rubber, polyurea, and polymer-fiber composite sheets, were examined by using a series of full-scale quasistatic tests to evaluate their static resistance. Finite-element modeling was performed to study the straining action of the wall elements, including the retrofit system. Nonlinear single-degree-of-freedom dynamic analysis was performed to calculate the blast response and study the mitigation effects of the various sheet materials considered. Experimental results showed that all retrofits exhibited significant energy absorption after a support rotation of 10°. Finite-element models were able to closely predict the static resistance function of these retrofitted walls. Parameters such as friction coefficient, end-connection gap due to slack in the sheet, and connection stiffness were investigated. It was found that by increasing the initial gap to account for slack, the membrane action is delayed, which increases the ductility of the wall and the area under the resistance-displacement curve. Increasing the friction and the stiffness of the end-connection increased the resistance and the overall energy absorption of the retrofitted wall system.

ACS Style

A. E. El-Sisi; A. Saucier; H. A. Salim; J. M. Hoemann. Experimental and Numerical Evaluation of Reinforced Concrete Walls Retrofit Systems for Blast Mitigation. Journal of Performance of Constructed Facilities 2019, 33, 04018113 .

AMA Style

A. E. El-Sisi, A. Saucier, H. A. Salim, J. M. Hoemann. Experimental and Numerical Evaluation of Reinforced Concrete Walls Retrofit Systems for Blast Mitigation. Journal of Performance of Constructed Facilities. 2019; 33 (2):04018113.

Chicago/Turabian Style

A. E. El-Sisi; A. Saucier; H. A. Salim; J. M. Hoemann. 2019. "Experimental and Numerical Evaluation of Reinforced Concrete Walls Retrofit Systems for Blast Mitigation." Journal of Performance of Constructed Facilities 33, no. 2: 04018113.

Conference paper
Published: 17 April 2018 in Structures Conference 2018
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Building envelope is the most critical line of defense to protect structural components and occupants against external explosion threats. Much research has been done, and design methods have been developed and verified, for exterior building wall systems under blast loads. Limited research exists for roof truss systems under blast loading, and the resistance of roof trusses to failure are not well-defined. In addition, the blast load on a roof system varies with space and time, which makes it more complex compared to that experienced by building walls. Current design methods calculate the response based on equivalent blast roof loading. In this paper, the dynamic response of roof system under blast loading will be predicted numerically using the actual blast load on the roof and compared to the dynamic response calculated based on the equivalent blast roof loading. The dynamic predictions will be verified using full-scale field experiments using live explosions. In addition, the static resistance function of open-web steel joist roof trusses will be developed using full-scale experiments and numerical simulations. The verified numerical models will be used to analyze the dynamic structural response of open-web steel joist roof truss system under blast loading.

ACS Style

Doaa Bondok; Gabriela Clayton; Hani Salim. Dynamic Response of Roof Truss Systems under Blast Loading. Structures Conference 2018 2018, 1 .

AMA Style

Doaa Bondok, Gabriela Clayton, Hani Salim. Dynamic Response of Roof Truss Systems under Blast Loading. Structures Conference 2018. 2018; ():1.

Chicago/Turabian Style

Doaa Bondok; Gabriela Clayton; Hani Salim. 2018. "Dynamic Response of Roof Truss Systems under Blast Loading." Structures Conference 2018 , no. : 1.

Conference paper
Published: 17 April 2018 in Structures Congress 2018
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End cover separation and shear crack debonding are the two most critical modes of failure in RC beams retrofitted with steel plates or carbon fiber reinforced polymer (CFRP) composite plates due to the brittle nature of the failures. In this paper, a 3D finite element analysis was used to simulate the peeling failure of strengthened beams using either smeared and/or discrete crack approaches. The effect of the thickness, stiffness, and length of the bonded plates and adhesive layer were investigated in this paper. Also, the effect of concrete cover replacement on the peeling failure was studied. Extending the CFRP plate length to 55% of the shear span enhanced the ultimate load capacity by over 200% compared to the un-strengthened beam. Further extension of the CFRP plate in the shear span had little effect on the flexural capacity of the beam. Beams with concrete cover replacement had higher ultimate load and deflection and bending stiffness than strengthened beams without cover replacement.

ACS Style

Hesham M. El-Emam; Hani A. Salim; Amal Badawy; Hossam E. M. Sallam. Peeling Prevention in Strengthened RC Beams Using End Cover Replacement. Structures Congress 2018 2018, 1 .

AMA Style

Hesham M. El-Emam, Hani A. Salim, Amal Badawy, Hossam E. M. Sallam. Peeling Prevention in Strengthened RC Beams Using End Cover Replacement. Structures Congress 2018. 2018; ():1.

Chicago/Turabian Style

Hesham M. El-Emam; Hani A. Salim; Amal Badawy; Hossam E. M. Sallam. 2018. "Peeling Prevention in Strengthened RC Beams Using End Cover Replacement." Structures Congress 2018 , no. : 1.

Conference paper
Published: 17 April 2018 in Structures Conference 2018
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Adobe construction is becoming popular in the American Southwest, but has always been used for construction in many parts of the world. When U.S. personnel move into an area, they often will temporarily occupy housing that is made out of adobe; therefore, it is necessary to understand the characteristics of such materials and building systems under blast. Therefore, the objective of this work is to characterize the mechanical properties of adobe to be able to model its response as a material type in structural elements. This research focused on evaluating the static resistance function of adobe walls, which was used for blast response calculations and modeling. An experimental program was conducted to evaluate the material and structural response of adobe materials and walls, as well as develop and evaluate possible blast retrofit designs. In this paper, material testing for shear, compression, and rupture properties and walls and wallettes under uniform pressure were evaluated. In addition, measured mechanical properties were used in a 3D finite element model and compared to the experimental results of the full-scale adobe wall systems. Blast response predictions and numerical models were verified using shock tube dynamic test results, and are presented in this paper.

ACS Style

Hesham El-Emam; Hani Salim; Stephen Robert; Gabriela Pigg; Aaron Saucier. Structural Characterization and Blast Response of Adobe Walls. Structures Conference 2018 2018, 1 .

AMA Style

Hesham El-Emam, Hani Salim, Stephen Robert, Gabriela Pigg, Aaron Saucier. Structural Characterization and Blast Response of Adobe Walls. Structures Conference 2018. 2018; ():1.

Chicago/Turabian Style

Hesham El-Emam; Hani Salim; Stephen Robert; Gabriela Pigg; Aaron Saucier. 2018. "Structural Characterization and Blast Response of Adobe Walls." Structures Conference 2018 , no. : 1.

Journal article
Published: 01 December 2017 in Journal of Bridge Engineering
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ACS Style

Sarah L. Orton; David Barrett; Alaa El-Din Elsisi; Andrew Pelikan; Hani Salim. Finger-Plate and Flat-Plate Expansion Device Design Evaluation. Journal of Bridge Engineering 2017, 22, 04017106 .

AMA Style

Sarah L. Orton, David Barrett, Alaa El-Din Elsisi, Andrew Pelikan, Hani Salim. Finger-Plate and Flat-Plate Expansion Device Design Evaluation. Journal of Bridge Engineering. 2017; 22 (12):04017106.

Chicago/Turabian Style

Sarah L. Orton; David Barrett; Alaa El-Din Elsisi; Andrew Pelikan; Hani Salim. 2017. "Finger-Plate and Flat-Plate Expansion Device Design Evaluation." Journal of Bridge Engineering 22, no. 12: 04017106.

Journal article
Published: 01 December 2017 in Journal of Performance of Constructed Facilities
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Open web steel joists (OWSJs) are prefabricated lightweight roof structure components that are designed for conventional loads in accordance with current standards and specifications. The resistance function currently used to design joists against blast loading is linearly elastic and perfectly plastic after the elastic deflection limit, which does not account for the different failure mechanisms of the joist components and system. For blast analysis and design of such roof trusses, further investigation of the behavior of these joists is needed. This paper presents numerical modeling and experimental evaluation of three different steel joist systems to failure to develop an accurate representation of the static resistance and energy absorption capabilities of OWSJ roof trusses to failure. Experimental results were used to verify robust explicit numerical models for predicting the static resistance function of OWSJ roof trusses. A deformable weld behavior was used to simulate all spot welds connecting web members to the joist top and bottom chords. Additionally, a criterion that predicts the failure of the end connection bearing seat of the joist system was included in the numerical simulation. The results of the numerical modeling and the experimental evaluation demonstrate the inadequacy of the current resistance models used for blast analysis purposes based on energy comparisons using various damage levels.

ACS Style

D. H. Bondok; H. A. Salim; M. A. McClendon. Static Resistance of Open Web Steel Joist Roof Trusses for Blast Response Analysis. Journal of Performance of Constructed Facilities 2017, 31, 04017106 .

AMA Style

D. H. Bondok, H. A. Salim, M. A. McClendon. Static Resistance of Open Web Steel Joist Roof Trusses for Blast Response Analysis. Journal of Performance of Constructed Facilities. 2017; 31 (6):04017106.

Chicago/Turabian Style

D. H. Bondok; H. A. Salim; M. A. McClendon. 2017. "Static Resistance of Open Web Steel Joist Roof Trusses for Blast Response Analysis." Journal of Performance of Constructed Facilities 31, no. 6: 04017106.

Review article
Published: 25 September 2017 in Advances in Structural Engineering
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ACS Style

Ayman El-Zohairy; Hani Salim; Hesham Shaaban; Suzan Mustafa; Ashraf El-Shihy. Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons. Advances in Structural Engineering 2017, 21, 933 -945.

AMA Style

Ayman El-Zohairy, Hani Salim, Hesham Shaaban, Suzan Mustafa, Ashraf El-Shihy. Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons. Advances in Structural Engineering. 2017; 21 (6):933-945.

Chicago/Turabian Style

Ayman El-Zohairy; Hani Salim; Hesham Shaaban; Suzan Mustafa; Ashraf El-Shihy. 2017. "Finite element analysis and parametric study of continuous steel–concrete composite beams stiffened with post-tensioned tendons." Advances in Structural Engineering 21, no. 6: 933-945.

Journal article
Published: 01 May 2017 in Journal of Structural Engineering
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The fatigue life of steel bridges can be extended by externally bonding carbon fiber–reinforced polymer (CFRP) patches to the damaged elements to arrest the crack propagation. In this paper, the influence of the patch pretension level, stiffness, and fiber orientation on the stress intensity factor levels are investigated. A three-dimensional finite-element model of the double-sided CFRP patch-strengthened specimen is used to study the fracture behavior of an inclined edge crack under different combinations of loading Modes I and II. The introduction of a compressive stress by pretensioning of the CFRP patch prior to bonding produced a significant reduction of up to 70% in stress intensity factors (SIFs) for different crack lengths, which led to increasing the remaining fatigue life of the steel member. The increase in the CFRP patch-to-steel axial stiffness ratio reduced the SIFs by up to 30%. The optimum benefit of using the CFRP patch to reduce mode I SIF was accomplished when the patch axial stiffness was about 50% of or below the steel plate stiffness. Furthermore, orienting the fibers perpendicular to the crack direction is not necessarily the most effective in arresting the crack propagation. The effectiveness of the fiber orientation in the composite patch depends mainly on both the loading direction and the crack inclination angle.

ACS Style

Hesham M. El-Emam; Hani A. Salim; Hossam E. M. Sallam. Composite Patch Configuration and Prestress Effect on SIFs for Inclined Cracks in Steel Plates. Journal of Structural Engineering 2017, 143, 04016229 .

AMA Style

Hesham M. El-Emam, Hani A. Salim, Hossam E. M. Sallam. Composite Patch Configuration and Prestress Effect on SIFs for Inclined Cracks in Steel Plates. Journal of Structural Engineering. 2017; 143 (5):04016229.

Chicago/Turabian Style

Hesham M. El-Emam; Hani A. Salim; Hossam E. M. Sallam. 2017. "Composite Patch Configuration and Prestress Effect on SIFs for Inclined Cracks in Steel Plates." Journal of Structural Engineering 143, no. 5: 04016229.

Conference paper
Published: 04 April 2017 in Structures Congress 2017
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ACS Style

Ayman El-Zohairy; Hani Salim; J. G. (Greg) Soules. Parametric Study of the External Strengthening of Composite Beams Using Post-Tensioned Tendons. Structures Congress 2017 2017, 58 -67.

AMA Style

Ayman El-Zohairy, Hani Salim, J. G. (Greg) Soules. Parametric Study of the External Strengthening of Composite Beams Using Post-Tensioned Tendons. Structures Congress 2017. 2017; ():58-67.

Chicago/Turabian Style

Ayman El-Zohairy; Hani Salim; J. G. (Greg) Soules. 2017. "Parametric Study of the External Strengthening of Composite Beams Using Post-Tensioned Tendons." Structures Congress 2017 , no. : 58-67.

Conference paper
Published: 04 April 2017 in Structures Congress 2017
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ACS Style

A. E. El-Sisi; A. Saucier; H. A. Salim; M. Nawar; J. G. (Greg) Soules. Experimental and Numerical Analysis for Non-Load Bearing Sandwich Wall Panels for Blast Mitigation. Structures Congress 2017 2017, 77 -85.

AMA Style

A. E. El-Sisi, A. Saucier, H. A. Salim, M. Nawar, J. G. (Greg) Soules. Experimental and Numerical Analysis for Non-Load Bearing Sandwich Wall Panels for Blast Mitigation. Structures Congress 2017. 2017; ():77-85.

Chicago/Turabian Style

A. E. El-Sisi; A. Saucier; H. A. Salim; M. Nawar; J. G. (Greg) Soules. 2017. "Experimental and Numerical Analysis for Non-Load Bearing Sandwich Wall Panels for Blast Mitigation." Structures Congress 2017 , no. : 77-85.

Conference paper
Published: 04 April 2017 in Structures Congress 2017
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ACS Style

S. Robert; H. El-Emam; A. Saucier; H. Salim; Scott Bade; J. G. (Greg) Soules. Evaluation of Full-Scale Adobe Brick Walls under Uniform Pressure. Structures Congress 2017 2017, 343 -353.

AMA Style

S. Robert, H. El-Emam, A. Saucier, H. Salim, Scott Bade, J. G. (Greg) Soules. Evaluation of Full-Scale Adobe Brick Walls under Uniform Pressure. Structures Congress 2017. 2017; ():343-353.

Chicago/Turabian Style

S. Robert; H. El-Emam; A. Saucier; H. Salim; Scott Bade; J. G. (Greg) Soules. 2017. "Evaluation of Full-Scale Adobe Brick Walls under Uniform Pressure." Structures Congress 2017 , no. : 343-353.

Research article
Published: 08 January 2017 in Advances in Structural Engineering
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Strengthening of bridge superstructures composite beams with external post-tensioned tendons is a good technique for strengthening the existing structures. In this study, a numerical model is illustrated to study the nonlinear simulation of composite beams stiffened with externally post-tensioned tendons. The accuracy of the developed numerical model is validated using comparisons between the numerical and existing test data. The influence of various strengthening parameters is investigated, which include draped versus straight tendons, tendon length, the effect of post-tensioning on reinstating the flexural behavior of an overloaded beam, tendon eccentricity, and the degree of shear connection. A good agreement between the proposed model and the test data is obtained. The results demonstrate that at the same tendon eccentricity, the trapezoidal profile shows better behavior for the strengthened beams. However, more ductility is obtained when using the straight tendon profile. Applying post-tensioning through the beam of full length helps to reduce the creation of fatigue cracks, which always start at stress raisers, and subsequently increases the fatigue life of the composite beam. Also, the external post-tensioning effectively maintains the flexural behavior of the overloaded strengthened beam after unloading in comparison to the un-strengthened beam. It is observed that 80% degree of shear connection or higher is recommended to obtain the desired performance of the external post-tensioning force for strengthening composite beams.

ACS Style

Ayman El-Zohairy; Hani Salim. Parametric study for post-tensioned composite beams with external tendons. Advances in Structural Engineering 2017, 20, 1433 -1450.

AMA Style

Ayman El-Zohairy, Hani Salim. Parametric study for post-tensioned composite beams with external tendons. Advances in Structural Engineering. 2017; 20 (10):1433-1450.

Chicago/Turabian Style

Ayman El-Zohairy; Hani Salim. 2017. "Parametric study for post-tensioned composite beams with external tendons." Advances in Structural Engineering 20, no. 10: 1433-1450.