Documents disponibles écrits par cet auteur

Cyclic loading test for reinforced concrete frame with thin steel infill plate / In-Rak Choi in Journal of structural engineering, Vol. 137 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 6 (Juin 2011) . - pp. 654-664 Titre : Cyclic loading test for reinforced concrete frame with thin steel infill plate Type de document : texte imprimé Auteurs : In-Rak Choi, Auteur ; Hong-Gun Park, Auteur Année de publication : 2011 Article en page(s) : pp. 654-664 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Steel  plates  Shear  walls  Reinforced  concrete  Frames  Cyclic  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An experimental study was performed to investigate the cyclic behavior of walls that are composed of reinforced concrete boundary frames and thin steel infill plates. For this purpose, three-story steel plate infilled walls (SPIW) were tested. The parameters in this test were the reinforcement ratio of the columns and opening in the infill plates. A reinforced concrete infilled wall (RCIW) and a reinforced concrete frame (RCF) were also tested for comparison. The deformation capacity of the SPIW specimens was significantly greater than that of the RCIW specimen, though the specimens exhibited an identical load-carrying capacity. Similar to the steel plate walls with steel boundary frames, the SPIW specimens showed excellent strength, deformation capacity, and energy dissipation capacity. Furthermore, by using the steel infill plates, shear cracking and failure of the column-beam joints were prevented. By using the strip model, the strength and initial stiffness of the SPIW specimens were predicted. The prediction results were compared with the test results. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i6/p654_s1?isAuthorized=no [article] Cyclic loading test for reinforced concrete frame with thin steel infill plate [texte imprimé] / In-Rak Choi, Auteur ; Hong-Gun Park, Auteur . - 2011 . - pp. 654-664. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 6 (Juin 2011) . - pp. 654-664 Mots-clés : Steel  plates  Shear  walls  Reinforced  concrete  Frames  Cyclic  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An experimental study was performed to investigate the cyclic behavior of walls that are composed of reinforced concrete boundary frames and thin steel infill plates. For this purpose, three-story steel plate infilled walls (SPIW) were tested. The parameters in this test were the reinforcement ratio of the columns and opening in the infill plates. A reinforced concrete infilled wall (RCIW) and a reinforced concrete frame (RCF) were also tested for comparison. The deformation capacity of the SPIW specimens was significantly greater than that of the RCIW specimen, though the specimens exhibited an identical load-carrying capacity. Similar to the steel plate walls with steel boundary frames, the SPIW specimens showed excellent strength, deformation capacity, and energy dissipation capacity. Furthermore, by using the steel infill plates, shear cracking and failure of the column-beam joints were prevented. By using the strip model, the strength and initial stiffness of the SPIW specimens were predicted. The prediction results were compared with the test results. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i6/p654_s1?isAuthorized=no

Cyclic seismic testing of composite concrete-filled U-shaped steel beam to H-shaped column connections / Cheol-Ho Lee in Journal of structural engineering, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 360–378 Titre : Cyclic seismic testing of composite concrete-filled U-shaped steel beam to H-shaped column connections Type de document : texte imprimé Auteurs : Cheol-Ho Lee, Auteur ; Hong-Gun Park, Auteur ; Chang-Hee Park, Auteur Année de publication : 2013 Article en page(s) : pp. 360–378 Note générale : structural engineering Langues : Anglais (eng) Mots-clés : seismic  composite  connection;  U-shaped  composite  beam;  cyclic  tests;  special  moment  frames Résumé : In this study, the cyclic seismic performance of a concrete-filled U-shaped steel beam to H-shaped steel column connections was experimentally evaluated. The concrete-filled U-shaped steel beams were compositely attached to the concrete floor slab. The test was conducted in two stages. The first testing program was carried out on one-sided moment connections to find the most promising connecting scheme. The strengthening scheme, or welding steel plates to the beam bottom flange with minimized stress concentration, was shown to be the most satisfactory, and it was used in the second-stage test on two full-scale cruciform specimens. Considering the unique constructional nature of the proposed composite connections, the critical limit states such as weld fracture, local buckling, concrete crushing, and rebar buckling were carefully addressed in designing specimens. Test results showed that the connection details and design procedures proposed in this study can successfully control the critical limit states mentioned previously. The proposed connection detail successfully pushed the plastic hinging to the tip of the strengthened zone as intended in design, thus effectively protecting the more vulnerable beam-to-column welded joint. The specimens typically exhibited a maximum story drift capacity of more than 5.5% rad, exceeding the minimum limit of 4% rad required of special moment frames. Four of the five specimens tested in this study eventually failed because of a low-cycle fatigue fracture across the beam bottom flange at a high story drift greater than 5.0% rad. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000635 [article] Cyclic seismic testing of composite concrete-filled U-shaped steel beam to H-shaped column connections [texte imprimé] / Cheol-Ho Lee, Auteur ; Hong-Gun Park, Auteur ; Chang-Hee Park, Auteur . - 2013 . - pp. 360–378. structural engineering Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 360–378 Mots-clés : seismic  composite  connection;  U-shaped  composite  beam;  cyclic  tests;  special  moment  frames Résumé : In this study, the cyclic seismic performance of a concrete-filled U-shaped steel beam to H-shaped steel column connections was experimentally evaluated. The concrete-filled U-shaped steel beams were compositely attached to the concrete floor slab. The test was conducted in two stages. The first testing program was carried out on one-sided moment connections to find the most promising connecting scheme. The strengthening scheme, or welding steel plates to the beam bottom flange with minimized stress concentration, was shown to be the most satisfactory, and it was used in the second-stage test on two full-scale cruciform specimens. Considering the unique constructional nature of the proposed composite connections, the critical limit states such as weld fracture, local buckling, concrete crushing, and rebar buckling were carefully addressed in designing specimens. Test results showed that the connection details and design procedures proposed in this study can successfully control the critical limit states mentioned previously. The proposed connection detail successfully pushed the plastic hinging to the tip of the strengthened zone as intended in design, thus effectively protecting the more vulnerable beam-to-column welded joint. The specimens typically exhibited a maximum story drift capacity of more than 5.5% rad, exceeding the minimum limit of 4% rad required of special moment frames. Four of the five specimens tested in this study eventually failed because of a low-cycle fatigue fracture across the beam bottom flange at a high story drift greater than 5.0% rad. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000635

Eccentric axial load testing for concrete-encased steel columns using 800 MPa steel and 100 MPa concrete / Chang-Soo Kim in Journal of structural engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.1019–1031 Titre : Eccentric axial load testing for concrete-encased steel columns using 800 MPa steel and 100 MPa concrete Type de document : texte imprimé Auteurs : Chang-Soo Kim, Auteur ; Hong-Gun Park, Auteur ; Kyung-Soo Chung, Auteur Année de publication : 2012 Article en page(s) : pp.1019–1031 Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Concrete-encased  steel  Composite  column  High-strength  steel  High-strength  concrete  Eccentric  loading Résumé : Seven concrete-encased steel columns using high-strength steel (nominal yield strength fys=913 and 806 MPa) and high-strength concrete (cylinder compressive strength f′c=94 and 113 MPa) were tested to investigate the eccentric axial load-carrying capacity and the deformation capacity. The test parameters were full or partial concrete-encasement, the eccentricity of the axial load, and the effect of lateral reinforcement. Because the yield strain (≈0.004) of the high-strength steel is greater than the ultimate compressive strain (≈0.003) of the concrete subjected to short-term loads, the current study focused on the effect of early concrete crushing on the behavior of the composite columns. The test results showed that in the case of inadequate lateral confinement, the load-carrying capacity was limited by the early crushing of concrete. However, because of the high-strength steel section, all test specimens showed ductile flexural behavior after the delamination of the concrete. The test results were compared with the predictions by nonlinear numerical analysis and current design codes. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000533 [article] Eccentric axial load testing for concrete-encased steel columns using 800 MPa steel and 100 MPa concrete [texte imprimé] / Chang-Soo Kim, Auteur ; Hong-Gun Park, Auteur ; Kyung-Soo Chung, Auteur . - 2012 . - pp.1019–1031. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.1019–1031 Mots-clés : Concrete-encased  steel  Composite  column  High-strength  steel  High-strength  concrete  Eccentric  loading Résumé : Seven concrete-encased steel columns using high-strength steel (nominal yield strength fys=913 and 806 MPa) and high-strength concrete (cylinder compressive strength f′c=94 and 113 MPa) were tested to investigate the eccentric axial load-carrying capacity and the deformation capacity. The test parameters were full or partial concrete-encasement, the eccentricity of the axial load, and the effect of lateral reinforcement. Because the yield strain (≈0.004) of the high-strength steel is greater than the ultimate compressive strain (≈0.003) of the concrete subjected to short-term loads, the current study focused on the effect of early concrete crushing on the behavior of the composite columns. The test results showed that in the case of inadequate lateral confinement, the load-carrying capacity was limited by the early crushing of concrete. However, because of the high-strength steel section, all test specimens showed ductile flexural behavior after the delamination of the concrete. The test results were compared with the predictions by nonlinear numerical analysis and current design codes. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000533

Elongation of reinforced concrete members subjected to cyclic loading / Tae-Sung Eom in Journal of structural engineering, Vol. 136 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1044-1054 Titre : Elongation of reinforced concrete members subjected to cyclic loading Type de document : texte imprimé Auteurs : Tae-Sung Eom, Auteur ; Hong-Gun Park, Auteur Année de publication : 2011 Article en page(s) : pp. 1044-1054 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Beams  Concrete  reinforced  Cyclic  loads  Plastic  hinges  Seismic  design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Longitudinal elongation develops in reinforced concrete members that exhibit flexural yielding during cyclic loading. The longitudinal elongation can decrease the shear strength and deformation capacity of the members. In the present study, nonlinear truss model analysis was performed to study the elongation mechanism of reinforced concrete beams and the effects of various design variables on the elongation. The results showed that residual tensile plastic strain of the longitudinal reinforcement in the plastic hinge is the primary factor causing the member elongation and that the shear-force transfer mechanism of diagonal concrete struts has a substantial effect on the magnitude of the elongation. Based on the elongation mechanism found by truss model analysis, a simplified method for evaluating member elongation was developed. The proposed method was applied to test specimens with various design parameters and loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1044_s1?isAuthorized=no [article] Elongation of reinforced concrete members subjected to cyclic loading [texte imprimé] / Tae-Sung Eom, Auteur ; Hong-Gun Park, Auteur . - 2011 . - pp. 1044-1054. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1044-1054 Mots-clés : Beams  Concrete  reinforced  Cyclic  loads  Plastic  hinges  Seismic  design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Longitudinal elongation develops in reinforced concrete members that exhibit flexural yielding during cyclic loading. The longitudinal elongation can decrease the shear strength and deformation capacity of the members. In the present study, nonlinear truss model analysis was performed to study the elongation mechanism of reinforced concrete beams and the effects of various design variables on the elongation. The results showed that residual tensile plastic strain of the longitudinal reinforcement in the plastic hinge is the primary factor causing the member elongation and that the shear-force transfer mechanism of diagonal concrete struts has a substantial effect on the magnitude of the elongation. Based on the elongation mechanism found by truss model analysis, a simplified method for evaluating member elongation was developed. The proposed method was applied to test specimens with various design parameters and loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1044_s1?isAuthorized=no

Hysteresis model of thin infill plate for cyclic nonlinear analysis of steel plate shear walls / In-Rak Choi in Journal of structural engineering, Vol. 136 N° 11 (Novembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1423-1434 Titre : Hysteresis model of thin infill plate for cyclic nonlinear analysis of steel plate shear walls Type de document : texte imprimé Auteurs : In-Rak Choi, Auteur ; Hong-Gun Park, Auteur Année de publication : 2011 Article en page(s) : pp. 1423-1434 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Nonlinear  analysis  Steel  plates  Shear  walls  Cyclic  loads  Inelasticity Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A hysteresis model for thin infill steel plates was developed to evaluate the nonlinear cyclic behavior of steel plate shear walls. Nonlinear finite-element analysis was performed for thin steel plates with a rigid boundary frame. Based on the analysis results, the hysteretic behavior of the infill steel plate was simplified as an equivalent uniaxial stress-strain relationship in the direction of tension-field action. The proposed hysteresis model was implemented in macroscopic analysis models for infill steel plates, i.e., the tension strip model and equivalent tension brace model. The proposed method was applied to existing test specimens with various design parameters and loading conditions. The prediction results were compared with the test results. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1423_s1?isAuthorized=no [article] Hysteresis model of thin infill plate for cyclic nonlinear analysis of steel plate shear walls [texte imprimé] / In-Rak Choi, Auteur ; Hong-Gun Park, Auteur . - 2011 . - pp. 1423-1434. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1423-1434 Mots-clés : Nonlinear  analysis  Steel  plates  Shear  walls  Cyclic  loads  Inelasticity Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A hysteresis model for thin infill steel plates was developed to evaluate the nonlinear cyclic behavior of steel plate shear walls. Nonlinear finite-element analysis was performed for thin steel plates with a rigid boundary frame. Based on the analysis results, the hysteretic behavior of the infill steel plate was simplified as an equivalent uniaxial stress-strain relationship in the direction of tension-field action. The proposed hysteresis model was implemented in macroscopic analysis models for infill steel plates, i.e., the tension strip model and equivalent tension brace model. The proposed method was applied to existing test specimens with various design parameters and loading conditions. The prediction results were compared with the test results. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1423_s1?isAuthorized=no

Lattice shear reinforcement for enhancement of slab-column connections / Hong-Gun Park in Journal of structural engineering, Vol. 138 N° 3 (Mars 2012) 

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