This page has only limited features, please log in for full access.
For an open-deck steel plate girder railway bridge with rail joints, frequent damage to the bridge members and a high level of noise and vibration occur. By installing continuous welded rail (CWR) to the bridge, it is possible to reduce the noise and impact force of the bridge. However, current girder–sleeper fasteners have low lateral resistance in nature and track buckling can occur when CWR is used on such a bridge. Therefore, a new girder-sleeper fastener with proper lateral resistance to prevent CWR track buckling is needed. In this study, the lateral resistance requirements of a girder-sleeper fastener are investigated through a series of finite element (FE) analyses and parametric study. The effect of peak lateral resistance of the fastener, curve radius, girder length, and lateral displacement of girder are examined. From the analysis results, the peak lateral resistance criterion of the girder–sleeper fastener is proposed for the design of a new fastener for CWR tracks on an open-deck steel plate girder bridge.
Hyeoung-Deok Lee; Sanghyun Choi; Jiho Moon. Lateral Resistance Requirement of Girder-Sleeper Fastener for CWR Track on an Open-Deck Steel Plate Girder Bridge. Applied Sciences 2021, 11, 6681 .
AMA StyleHyeoung-Deok Lee, Sanghyun Choi, Jiho Moon. Lateral Resistance Requirement of Girder-Sleeper Fastener for CWR Track on an Open-Deck Steel Plate Girder Bridge. Applied Sciences. 2021; 11 (15):6681.
Chicago/Turabian StyleHyeoung-Deok Lee; Sanghyun Choi; Jiho Moon. 2021. "Lateral Resistance Requirement of Girder-Sleeper Fastener for CWR Track on an Open-Deck Steel Plate Girder Bridge." Applied Sciences 11, no. 15: 6681.
In this study, new-type hybrid faring is suggested to improve the aerodynamic performance of the long-span cable-stayed bridge. The proposed fairing is developed by applying the concept of the multibox section to the normal faring. The proposed faring has void regions inside the faring so that wind passes through the gaps in the faring. As a result, the wind flow is changed and the forces to the bridge section are reduced. The efficiency of the proposed faring was verified by a series of wind tunnel test. From the test result, it can be found that aerodynamic performances, such as drag force and flutter resistance, are enhanced.
Hoyeop Lee; Jiho Moon. Aerodynamic Characteristics Evaluation of a Cable-Stayed Bridge Section with a New-Type Hybrid Fairing. Shock and Vibration 2021, 2021, 1 -13.
AMA StyleHoyeop Lee, Jiho Moon. Aerodynamic Characteristics Evaluation of a Cable-Stayed Bridge Section with a New-Type Hybrid Fairing. Shock and Vibration. 2021; 2021 ():1-13.
Chicago/Turabian StyleHoyeop Lee; Jiho Moon. 2021. "Aerodynamic Characteristics Evaluation of a Cable-Stayed Bridge Section with a New-Type Hybrid Fairing." Shock and Vibration 2021, no. : 1-13.
Rockfall protection facilities are necessary to reduce damages from rockfall or debris flow on roads near steep cut slopes. In Korea, rockfall protection fences and rock sheds are widely utilized for rockfall protection facilities. The rock shed is made of reinforced concrete or steel in the shape of a tunnel, and it is used for protecting the road from massive rockfall (up to 3,000 kJ of rockfall energy). In this study, a new type of rock shed comprising a Concrete-Filled-Tube (CFT) was designed. First, the proposed CFT rock shed could resist up to 3,000 kJ rockfall energy. Next, the performance of the CFT was verified through static analysis in which the 3,000 kJ rockfall energy was considered as the equivalent static load.
Juho Lee; Hyeoung-Deok Lee; Jong-Keol Song; Jiho Moon. Design and Static-Performance Evaluation of Concrete-Filled-Tube Rock Shed Structure. Journal of the Korean Society of Hazard Mitigation 2020, 20, 165 -173.
AMA StyleJuho Lee, Hyeoung-Deok Lee, Jong-Keol Song, Jiho Moon. Design and Static-Performance Evaluation of Concrete-Filled-Tube Rock Shed Structure. Journal of the Korean Society of Hazard Mitigation. 2020; 20 (5):165-173.
Chicago/Turabian StyleJuho Lee; Hyeoung-Deok Lee; Jong-Keol Song; Jiho Moon. 2020. "Design and Static-Performance Evaluation of Concrete-Filled-Tube Rock Shed Structure." Journal of the Korean Society of Hazard Mitigation 20, no. 5: 165-173.
Hyungon Park; Hyunick Jang; Bumjoo Kim; Jiho Moon. Study on a Standardized Rockfall-Protection Fence for Various Rockfall Impact Energy using Finite Element Analysis. Journal of the Computational Structural Engineering Institute of Korea 2020, 33, 297 -302.
AMA StyleHyungon Park, Hyunick Jang, Bumjoo Kim, Jiho Moon. Study on a Standardized Rockfall-Protection Fence for Various Rockfall Impact Energy using Finite Element Analysis. Journal of the Computational Structural Engineering Institute of Korea. 2020; 33 (5):297-302.
Chicago/Turabian StyleHyungon Park; Hyunick Jang; Bumjoo Kim; Jiho Moon. 2020. "Study on a Standardized Rockfall-Protection Fence for Various Rockfall Impact Energy using Finite Element Analysis." Journal of the Computational Structural Engineering Institute of Korea 33, no. 5: 297-302.
Soobong Shin; Ji-Yeong Hong; Jiho Moon; Jong-Keol Song. Seismic Response Evaluation of Composite Steel–Concrete Box Girder Bridge according to Aging Effect of Piers. Journal of the Computational Structural Engineering Institute of Korea 2020, 33, 319 -329.
AMA StyleSoobong Shin, Ji-Yeong Hong, Jiho Moon, Jong-Keol Song. Seismic Response Evaluation of Composite Steel–Concrete Box Girder Bridge according to Aging Effect of Piers. Journal of the Computational Structural Engineering Institute of Korea. 2020; 33 (5):319-329.
Chicago/Turabian StyleSoobong Shin; Ji-Yeong Hong; Jiho Moon; Jong-Keol Song. 2020. "Seismic Response Evaluation of Composite Steel–Concrete Box Girder Bridge according to Aging Effect of Piers." Journal of the Computational Structural Engineering Institute of Korea 33, no. 5: 319-329.
The object of this paper is to investigate the carbonation resistance of concretes containing different pozzolanic materials. Three concrete mixtures that included fly ash, silica fume, and nanosilica were prepared, and the mixtures were designed to have similar mechanical properties to exclude the effect of mechanical properties on the carbonation. These pozzolanic materials in concretes have different silicate contents and grain size distributions. Rapid carbonation tests were conducted to investigate the durability of pozzolan blended concretes for carbonation, and the carbonation depth was measured at one, two, four, and eight weeks after 28-day water curing. 29Si NMR (nuclear magnetic resonance) experiments were performed, and the conversion fractions for each pozzolan blended concrete were extracted. The degree of carbonation was also assessed based on the Nuclear magnetic resonance (NMR) results.
Jung Kim; Kwang-Soo Youm; Jiho Moon. A Study on Conversion Fraction and Carbonation of Pozzolan Blended Concrete through 29Si MAS NMR Analysis. Applied Sciences 2020, 10, 6855 .
AMA StyleJung Kim, Kwang-Soo Youm, Jiho Moon. A Study on Conversion Fraction and Carbonation of Pozzolan Blended Concrete through 29Si MAS NMR Analysis. Applied Sciences. 2020; 10 (19):6855.
Chicago/Turabian StyleJung Kim; Kwang-Soo Youm; Jiho Moon. 2020. "A Study on Conversion Fraction and Carbonation of Pozzolan Blended Concrete through 29Si MAS NMR Analysis." Applied Sciences 10, no. 19: 6855.
Seong-Jae Park; NakHyun Chun; Kyeong-Min Hwang; Jiho Moon; Jong-Keol Song. Evaluation of Acceleration Amplification Factors Based on the Structural Type of Substation for the Seismic Design of Power Facilities. Journal of the Computational Structural Engineering Institute of Korea 2020, 33, 159 -169.
AMA StyleSeong-Jae Park, NakHyun Chun, Kyeong-Min Hwang, Jiho Moon, Jong-Keol Song. Evaluation of Acceleration Amplification Factors Based on the Structural Type of Substation for the Seismic Design of Power Facilities. Journal of the Computational Structural Engineering Institute of Korea. 2020; 33 (3):159-169.
Chicago/Turabian StyleSeong-Jae Park; NakHyun Chun; Kyeong-Min Hwang; Jiho Moon; Jong-Keol Song. 2020. "Evaluation of Acceleration Amplification Factors Based on the Structural Type of Substation for the Seismic Design of Power Facilities." Journal of the Computational Structural Engineering Institute of Korea 33, no. 3: 159-169.
In this study, a full-scale train bogie derailment test was conducted. For this, test methodologies to describe the wheel-climbing derailment of the train bogie and to obtain accurate test data were proposed. The derailment test was performed with the casting bogie for a freight train and a Rheda 2000 concrete track. Two different derailment velocities (28.08 km/h and 55.05 km/h) were considered. From the test, it was found that humps in the concrete track affected the post-derailment behavior of the bogie when the derailment velocity was 28.08 km/h. For a higher derailment velocity (55.05 km/h), significant lateral movement of the derailed bogie was observed. This lateral movement was first controlled by wheel–rail contact, followed by contact with the containment wall. Finally, the train was returned to the track center.
Hyun-Ung Bae; Jiho Moon; Seung-Jae Lim; Jong-Chan Park; Nam-Hyoung Lim; Lim. Full-Scale Train Derailment Testing and Analysis of Post-Derailment Behavior of Casting Bogie. Applied Sciences 2019, 10, 59 .
AMA StyleHyun-Ung Bae, Jiho Moon, Seung-Jae Lim, Jong-Chan Park, Nam-Hyoung Lim, Lim. Full-Scale Train Derailment Testing and Analysis of Post-Derailment Behavior of Casting Bogie. Applied Sciences. 2019; 10 (1):59.
Chicago/Turabian StyleHyun-Ung Bae; Jiho Moon; Seung-Jae Lim; Jong-Chan Park; Nam-Hyoung Lim; Lim. 2019. "Full-Scale Train Derailment Testing and Analysis of Post-Derailment Behavior of Casting Bogie." Applied Sciences 10, no. 1: 59.
The two-edge box girder has been widely used as a stiffened girder in cable-stayed bridges. However, such girders have weakness in aerodynamic stability. To improve its aerodynamic stability, some previous researchers have given slope to the edge box instead of installing additional attachments to aerodynamically stabilize the bridge. For wind load design, an angle of attack (AOA) has to be considered. However, the effect of AOA has not been studied for sloped box girder yet. In the present study, the effect of AOA on the static wind load coefficient was investigated for 2-edge sloped box girder. A series of wind tunnel tests was performed by varying the box slope angle from 0° to 17° where AOA was set from −10° to 10°. Results showed that the lateral wind force is considerably reduced with the increase of the box slope angle except the case with the physical angle of 8°–11°. For practical AOA range, the box slope should be larger than 15° to minimize the aerodynamic static lateral force on the girder.
Hoyeop Lee; Jiho Moon. Static Wind Load Evaluation under Steady-State Wind Flow for 2-Edge Sloped Box Girder by Using Wind Tunnel Test. Advances in Civil Engineering 2019, 2019, 1 -12.
AMA StyleHoyeop Lee, Jiho Moon. Static Wind Load Evaluation under Steady-State Wind Flow for 2-Edge Sloped Box Girder by Using Wind Tunnel Test. Advances in Civil Engineering. 2019; 2019 ():1-12.
Chicago/Turabian StyleHoyeop Lee; Jiho Moon. 2019. "Static Wind Load Evaluation under Steady-State Wind Flow for 2-Edge Sloped Box Girder by Using Wind Tunnel Test." Advances in Civil Engineering 2019, no. : 1-12.
Additional axial stresses in the rail are developed due to the influence of the track-bridge interaction (TBI) when the CWR (Continuous Welded Rail) track is used in the railway bridge. This is the main reason of the length limitation of railway bridge and an increase in the construction cost. Also, the track-bridge interaction analysis should be performed in order to examine the influence of track-bridge interaction. Several standards specifies analysis methods and limit values for TBI to guarantee the safety design of railway track. However, the interaction effects are not fully understood yet due to the uncertainty of ballasted track. Thus, the interaction effects should be investigated and verified based on the field test results. In this paper, the measurement and analysis method for the track-bridge interaction was proposed. For this, the measurement system was developed considering the parameters causing the track-bridge interaction, and the track-bridge interaction response caused by temperature change was measured and analyzed. From the results, the track-bridge interaction phenomenon can be fully analyzed and quantified through the measurement system presented in this study. In addition, finite element analysis was conducted and the results were compared with the measured track-bridge interaction response.
Kyung-Min Yun; Hyun-Ung Bae; Jiho Moon; Jung-Joong Kim; Jong-Chan Park; Nam-Hyoung Lim. Quantification of ballasted track-bridge interaction behavior due to the temperature variation through field measurements. NDT & E International 2019, 103, 84 -97.
AMA StyleKyung-Min Yun, Hyun-Ung Bae, Jiho Moon, Jung-Joong Kim, Jong-Chan Park, Nam-Hyoung Lim. Quantification of ballasted track-bridge interaction behavior due to the temperature variation through field measurements. NDT & E International. 2019; 103 ():84-97.
Chicago/Turabian StyleKyung-Min Yun; Hyun-Ung Bae; Jiho Moon; Jung-Joong Kim; Jong-Chan Park; Nam-Hyoung Lim. 2019. "Quantification of ballasted track-bridge interaction behavior due to the temperature variation through field measurements." NDT & E International 103, no. : 84-97.
A footing-to-reinforced concrete (RC) pier connection resists the lateral load induced by earthquakes as well as the gravity load. The footing-to-RC pier connection is the vulnerable part to strong earthquake loading. Several studies have been conducted on improving the seismic performance of the connection by using high-strength reinforcing bars and by adding special structural components, such as steel tube and fiber-reinforced polymer sheet. In this study, reinforcing bars made of high-manganese steel (HMSBs) with high strength and ductility were installed in the connection instead of conventional reinforcing bars to improve the seismic performance. Test specimens were fabricated with HMSBs, and the strength, ductility, and dissipated energy of the connection were evaluated through a cyclic loading test. Three-dimensional finite-element analysis was also performed to investigate the effects of various axial forces on the behavior of the connection with HMSBs. The results show that the connection with HMSBs exhibits better seismic performance, represented by flexural strength, ductility, and energy dissipation, than that with ordinary reinforcing bars.
Jung-Kyun Kim; Hak-Eun Lee; Jongmin Kim; Jiho Moon. Seismic Performance Evaluation of Footing-to-Circular RC Pier Connection Reinforced by High-Manganese Steel Bars (HMSBs). Advances in Civil Engineering 2018, 2018, 1 -15.
AMA StyleJung-Kyun Kim, Hak-Eun Lee, Jongmin Kim, Jiho Moon. Seismic Performance Evaluation of Footing-to-Circular RC Pier Connection Reinforced by High-Manganese Steel Bars (HMSBs). Advances in Civil Engineering. 2018; 2018 ():1-15.
Chicago/Turabian StyleJung-Kyun Kim; Hak-Eun Lee; Jongmin Kim; Jiho Moon. 2018. "Seismic Performance Evaluation of Footing-to-Circular RC Pier Connection Reinforced by High-Manganese Steel Bars (HMSBs)." Advances in Civil Engineering 2018, no. : 1-15.
The flexural strength of the concrete-filled steel tube (CFST) composite girder was investigated in this study. Firstly, simple equations to evaluate the flexural strength of the CFST composite girder under both positive and negative bending moment were derived based on the plastic stress distribution method (PSDM). A series of tests was then conducted to verify the accuracy of the proposed equation, and to investigate the effect of internal shear connectors between the steel tube and concrete infill. Further, non-linear finite element analysis for each test specimen was performed to demonstrate the failure mechanism, and to set up the verified finite element analysis model. From the results, it was found that the proposed equations provided a reasonably conservative prediction of the flexural strength of the CFST composite girder under both positive and negative bending moment, and the effect of internal shear connectors between the steel tube and concrete infill on the flexural strength was negligible. A series of parametric studies was performed to investigate the effect of the D/t ratio, compressive strength of the concrete infill, and local buckling of the steel tube on the flexural strength of the CFST composite girder. Finally, some design considerations are noted based on the results of the parametric study.
Junghyun Cho; Jiho Moon; Hee-Jung Ko; Hak-Eun Lee. Flexural strength evaluation of concrete-filled steel tube (CFST) composite girder. Journal of Constructional Steel Research 2018, 151, 12 -24.
AMA StyleJunghyun Cho, Jiho Moon, Hee-Jung Ko, Hak-Eun Lee. Flexural strength evaluation of concrete-filled steel tube (CFST) composite girder. Journal of Constructional Steel Research. 2018; 151 ():12-24.
Chicago/Turabian StyleJunghyun Cho; Jiho Moon; Hee-Jung Ko; Hak-Eun Lee. 2018. "Flexural strength evaluation of concrete-filled steel tube (CFST) composite girder." Journal of Constructional Steel Research 151, no. : 12-24.
Fatal train accidents usually involve derailments or collisions. These derailment/collision accidents are infrequent. However, the damage due to derailment can be catastrophic. Derailment containment walls are usually used in Korea to minimize such damages. However, the impact forces that are needed to design the derailment containment walls were not well defined, and only limited studies were conducted for the behavior of the derailment containment walls. In this study, the focus was made on the impact force analysis of the containment wall through a series of 3D collision simulation after train derailment. Finite element modeling was conducted to analyze the dynamic behavior of the derailed train that collides with a structure such as containment wall using the LS-DYNA analysis software application. The FE models of car bodies, bogie frames, and wheel sets were created such that full conformity was achieved between their numerical models and actual vehicles with respect to the masses and principal mass moments of inertia. In addition, various installation situations of the containment wall were considered for the collision simulation. Finally, the economical alternative method to reduce the impact force was proposed.
Hyun-Ung Bae; Kyung-Min Yun; Jiho Moon; Nam-Hyoung Lim. Impact Force Evaluation of the Derailment Containment Wall for High-Speed Train through a Collision Simulation. Advances in Civil Engineering 2018, 2018, 1 -14.
AMA StyleHyun-Ung Bae, Kyung-Min Yun, Jiho Moon, Nam-Hyoung Lim. Impact Force Evaluation of the Derailment Containment Wall for High-Speed Train through a Collision Simulation. Advances in Civil Engineering. 2018; 2018 ():1-14.
Chicago/Turabian StyleHyun-Ung Bae; Kyung-Min Yun; Jiho Moon; Nam-Hyoung Lim. 2018. "Impact Force Evaluation of the Derailment Containment Wall for High-Speed Train through a Collision Simulation." Advances in Civil Engineering 2018, no. : 1-14.
The thermal performance and durability of the thermally-enhanced concrete with various insulating materials were evaluated through a series of tests. Three types of insulating materials—diatomite powder, hollow micro-spheres, and a micro-foam agent—were used for both normalweight aggregate concrete (NWAC) and lightweight aggregate concrete (LWAC). The thermal conductivity was measured by two different test methods: quick thermal conductivity meter (QTM) and guarded hot wire (GHW) methods. Then, the results were compared with each other. All insulating materials used in this study proved their ability to reduce the thermal conductivity. Additionally, it can be found that the trend of a decrease in air-dry density is similar to that of thermal conductivity of thermally-enhanced concrete. Additional thermal transmission tests with seven large-scale specimens were conducted by using the calibrated hot box (CHB). However, from this tests, it was seen that thermal transmission reduction for tested specimens were not large compared to the thermal conductivity reduction measured by QTM and GHW, due to multiple heat transfer. To examine the durability of thermally-enhanced concretes, accelerated carbonation and freeze-thaw cycle tests were conducted. From the results, it can be found that the thermally-enhanced concrete shows good freeze-thaw resistance. However, the carbonation rates of the concretes increased rapidly and additional methods to improve the carbonation resistance should be considered.
Yong-Wook Jeong; Tae-Hoon Koh; Kwang-Soo Youm; Jiho Moon. Experimental Evaluation of Thermal Performance and Durability of Thermally-Enhanced Concretes. Applied Sciences 2017, 7, 811 .
AMA StyleYong-Wook Jeong, Tae-Hoon Koh, Kwang-Soo Youm, Jiho Moon. Experimental Evaluation of Thermal Performance and Durability of Thermally-Enhanced Concretes. Applied Sciences. 2017; 7 (8):811.
Chicago/Turabian StyleYong-Wook Jeong; Tae-Hoon Koh; Kwang-Soo Youm; Jiho Moon. 2017. "Experimental Evaluation of Thermal Performance and Durability of Thermally-Enhanced Concretes." Applied Sciences 7, no. 8: 811.
A polymeric hybrid composite system made of UHPC and CFRP was proposed as a retrofit system to enhance flexural strength and ductility of RC slabs. While the effectiveness of the proposed system was confirmed previously through testing three full-scale one-way slabs having two continuous spans, the slabs retrofitted with the hybrid system failed in shear. This sudden shear failure would stem from the excessive enhancement of the flexural strength over the shear strength. In this study, shear connectors were installed between the hybrid system and a RC slab. Using simple beam, only positive moment section was examined. Two full-scale RC slabs were cast and tested to failure: the first as a control and the second using this new strengthening technique. The proposed strengthening system increased the ultimate load carrying capacity of the slab by 70%, the stiffness by 60%, and toughness by 128%. The efficiency of shear connectors on ductile behavior of the retrofitted slab was also confirmed. After the UHPC top is separated from the slab, the shear connector transfer shear load and the slab system were in force equilibrium by compression in UHPC and tension in CFRP.
Jiho Moon; Mahmoud M. Reda Taha; Jung J. Kim. Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector. Advances in Materials Science and Engineering 2017, 2017, 1 -7.
AMA StyleJiho Moon, Mahmoud M. Reda Taha, Jung J. Kim. Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector. Advances in Materials Science and Engineering. 2017; 2017 ():1-7.
Chicago/Turabian StyleJiho Moon; Mahmoud M. Reda Taha; Jung J. Kim. 2017. "Flexural Strengthening of RC Slabs Using a Hybrid FRP-UHPC System Including Shear Connector." Advances in Materials Science and Engineering 2017, no. : 1-7.
Alternative numerical method for identification of flutter on free vibration system identification;flutter derivatives;free vibration; The minimization method is widely used to predict the dynamic characteristics of a system. Generally, data recorded by experiment (for example displacement) tends to contain noise, and the error in the properties of the system is proportional to the noise level (NL). In addition, the accuracy of the results depends on various factors such as the signal character, filtering method or cut off frequency. In particular, coupled terms in multimode systems show larger differences compared to the true value when measured in an environment with a high NL. The iterative least square (ILS) method was proposed to reduce these errors that occur under a high NL, and has been verified in previous research. However, the ILS method might be sensitive to the signal processing, including the determination of cutoff frequency. This paper focused on improving the accuracy of the ILS method, and proposed the modified ILS (MILS) method, which differs from the ILS method by the addition of a new calculation process based on correlation coefficients for each degree of freedom. Comparing the results of these systems with those of a numerical simulation revealed that both ILS and the proposed MILS method provided good prediction of the dynamic properties of the system under investigation (in this case, the damping ratio and damped frequency). Moreover, the proposed MILS method provided even better prediction results for the coupling terms of stiffness and damping coefficient matrix.
NakHyun Chun; Jiho Moon; Hak-Eun Lee. Alternative numerical method for identification of flutter on free vibration. Wind and Structures 2017, 24, 351 -365.
AMA StyleNakHyun Chun, Jiho Moon, Hak-Eun Lee. Alternative numerical method for identification of flutter on free vibration. Wind and Structures. 2017; 24 (4):351-365.
Chicago/Turabian StyleNakHyun Chun; Jiho Moon; Hak-Eun Lee. 2017. "Alternative numerical method for identification of flutter on free vibration." Wind and Structures 24, no. 4: 351-365.
Suk-Won Ji; Kwangsoo Youm; Jung J. Kim; Jiho Moon. The Damage Investigation of Sewer Pipe Surge Tank Concrete Experienced Sulfur Biodeterioration. Journal of the Korea Concrete Institute 2017, 29, 641 -647.
AMA StyleSuk-Won Ji, Kwangsoo Youm, Jung J. Kim, Jiho Moon. The Damage Investigation of Sewer Pipe Surge Tank Concrete Experienced Sulfur Biodeterioration. Journal of the Korea Concrete Institute. 2017; 29 (6):641-647.
Chicago/Turabian StyleSuk-Won Ji; Kwangsoo Youm; Jung J. Kim; Jiho Moon. 2017. "The Damage Investigation of Sewer Pipe Surge Tank Concrete Experienced Sulfur Biodeterioration." Journal of the Korea Concrete Institute 29, no. 6: 641-647.
Kwang-Soo Youm; Jiho Moon; Jae-Young Cho; Jung J. Kim. Experimental study on strength and durability of lightweight aggregate concrete containing silica fume. Construction and Building Materials 2016, 114, 517 -527.
AMA StyleKwang-Soo Youm, Jiho Moon, Jae-Young Cho, Jung J. Kim. Experimental study on strength and durability of lightweight aggregate concrete containing silica fume. Construction and Building Materials. 2016; 114 ():517-527.
Chicago/Turabian StyleKwang-Soo Youm; Jiho Moon; Jae-Young Cho; Jung J. Kim. 2016. "Experimental study on strength and durability of lightweight aggregate concrete containing silica fume." Construction and Building Materials 114, no. : 517-527.
Pre-made modular units permit rapid and economical construction and are increasingly used where repetitive units are required. The assembled building must behave as a single structure to effectively transfer the forces and moments developed by gravity and lateral loads. For this, individual modular units must be properly connected to each other. Therefore, evaluation of the behavior of connections used in modular construction is crucial. This study proposes an embedded steel column-to-foundation connection for modular structural systems and evaluates the behavior of the proposed connection. Experiments were performed to investigate the effect of the column embedment depth, the shape of the column end plate, and shear studs in the embedded region of the column on the connection behavior. Further, three dimensional nonlinear finite element analyses were conducted for each test specimen to demonstrate the in-depth behavior of the connection. Finally, a design equation for the proposed connection was proposed.
Keum-Sung Park; Jiho Moon; Sang-Sup Lee; Kyu-Woong Bae; Charles W. Roeder. Embedded steel column-to-foundation connection for a modular structural system. Engineering Structures 2016, 110, 244 -257.
AMA StyleKeum-Sung Park, Jiho Moon, Sang-Sup Lee, Kyu-Woong Bae, Charles W. Roeder. Embedded steel column-to-foundation connection for a modular structural system. Engineering Structures. 2016; 110 ():244-257.
Chicago/Turabian StyleKeum-Sung Park; Jiho Moon; Sang-Sup Lee; Kyu-Woong Bae; Charles W. Roeder. 2016. "Embedded steel column-to-foundation connection for a modular structural system." Engineering Structures 110, no. : 244-257.
The incorporation of pozzolanic materials in concrete has many beneficial effects to enhance the mechanical properties of concrete. The calcium silicate hydrates in cement matrix of concrete increase by pozzolanic reaction of silicates and calcium hydroxide. The fine pozzolanic particles fill spaces between clinker grains, thereby resulting in a denser cement matrix and interfacial transition zone between cement matrix and aggregates; this lowers the permeability and increases the compressive strength of concrete. In this study, Ordinary Portland Cement (OPC) was mixed with 1% and 3% nanosilica by weight to produce cement pastes with water to binder ratio (w/b) of 0.45. The specimens were cured for 7 days. 29Si nuclear magnetic resonance (NMR) experiments are conducted and conversion fraction of nanosilica is extracted. The results are compared with a solid-state kinetic model. It seems that pozzolanic reaction of nanosilica depends on the concentration of calcium hydroxide.
Jiho Moon; Mahmoud M. Reda Taha; Kwang-Soo Youm; Jung J. Kim. Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR. Materials 2016, 9, 99 .
AMA StyleJiho Moon, Mahmoud M. Reda Taha, Kwang-Soo Youm, Jung J. Kim. Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR. Materials. 2016; 9 (2):99.
Chicago/Turabian StyleJiho Moon; Mahmoud M. Reda Taha; Kwang-Soo Youm; Jung J. Kim. 2016. "Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR." Materials 9, no. 2: 99.