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Hiroshi Shima - One of the best experts on this subject based on the ideXlab platform.
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formulation for Shear force relative displacement relationship of l shape Shear Connector in steel concrete composite structures
Engineering Structures, 2013Co-Authors: R Soty, Hiroshi ShimaAbstract:Abstract This paper presents the Shear force–relative displacement relationship of L-shape Shear Connector subjected to strut compressive force in steel–concrete composite structures. The Shear Connectors were found to fail in two different failure modes, split failure mode and concrete crush or Shear failure mode. Consequently, an equation for a critical strut angle representing the border between the two failure modes was developed and proposed. The formulas to predict the ultimate Shear force and the Shear force–relative displacement relationship of the Shear Connector were established. The Shear force–relative displacement relationships can be represented by a unique enveloped curve by normalizing Shear forces by the ultimate Shear forces and relative displacements by the height of the Shear Connectors. According to the experimental results, the ultimate relative displacements of L-shape Shear Connector were approximately 0.02 times the height of the Shear Connector.
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formulation for maximum Shear force on l shape Shear Connector subjected to strut compressive force at splitting crack occurrence in steel concrete composite structures
Procedia Engineering, 2011Co-Authors: R Soty, Hiroshi ShimaAbstract:Abstract This study investigates the performances of L-shape Shear Connectors subjected to strut compressive force in steelconcrete composite structures by means of beam type test method. Experimental data showed that splitting crack occurrence in the concrete in front of the Shear Connector controlled the maximum Shear force on L-shape Shear Connector. An equation to predict the maximum Shear force at splitting crack occurrence which is a function of width, height, thickness to height ratio of the Shear Connector, and the concrete strength is proposed. Moreover, the horizontal relative displacements of the head of the Shear Connector were found to have big increments with small increments of Shear force after the occurrence of crack in the concrete from the head of the Shear Connector. Also, the occurrence of splitting crack in the concrete in front of the Shear Connector reversed the slip direction between concrete and steel plate in front of the Shear Connector.
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behaviors of l shape Shear Connector subjected to strut compressive force in beam type test specimens
2010Co-Authors: Soty Ros, Hiroshi ShimaAbstract:This study investigates the behaviors of L-shape Shear Connector subjected to strut compressive force in steel-concrete composite structure. It was found that splitting crack in the concrete in front of the Shear Connector controlled the maximum Shear force on the Shear Connector. After crack occurred in the concrete starting from the head of the Shear Connector, the Shear Connector started to have large displacements until occurrence of splitting crack. Moreover, occurrence of splitting crack was found to reverse the direction of the slip between concrete and steel plate in front of the Shear Connector.
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load displacement relationship of plate shape Shear Connector in steel concrete composite structures
Doboku Gakkai Ronbunshu, 1991Co-Authors: Chin Long Chuah, Hiroshi Shima, Rungrojsaratis VirachAbstract:With the aim to study the deformation and to estimate the capacity of plural Shear Connectors in steel-concrete composite structure, a series of specimens with various number of plate shape Shear Connectors were tested by direct pull-out test. Shear Connectors in between the ones nearby loaded end and free end exhibit an unique load-longitudinal displacement relationship. The effects of spacing, thickness and height of Shear Connector on this relationship were studied. Two simple equations obtained by empirical formulation of the load-longitudinal displacement relationship predict the capacity of plural Shear Connectors satisfactorily.
Chi Young Jung - One of the best experts on this subject based on the ideXlab platform.
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End-bearing resistance of Y-type perfobond rib according to rib width–height ratio
Journal of Constructional Steel Research, 2014Co-Authors: Chi Young Jung, Sejun ParkAbstract:Abstract A Y-type perfobond rib Shear Connector has a higher Shear resistance and ductility than a conventional perfobond rib Shear Connector, and can address the issues of low vertical resistance and the constructability of transverse rebars. This study focuses on push-out tests for verifying the performance of Y-type perfobond rib Shear Connectors. These tests are conducted according to the guidance provided in Eurocode-4. Previous studies on Y-type perfobond rib Shear Connectors aimed to verify their Shear performance using parameters such as the concrete strength, the presence of transverse rebar, the thickness of the rib, and the Y-shaped bending angle of the ribs. However, there are scant attempts to clarify the effects from different rib widths and heights. The end-bearing resistance of the Y-type perfobond rib Shear Connector may be determined by the sizes of the rib width and rib height. Therefore, the end-bearing resistance is comparatively analyzed in this study according to the rib widths and rib heights. On the basis of the push-out test results, the Shear resistance equation presented by Kim et al. [14] , [15] are improved. The improved equation is able to more rationally consider the effects from various rib shape factors and compressive strengths of concrete.
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Behavior of composite girder with Y-type perfobond rib Shear Connectors
Journal of Constructional Steel Research, 2014Co-Authors: Sang Hyo Kim, Sejun Park, Jae-gu Choi, Jin Hee Ahn, Chi Young JungAbstract:Abstract A Y-type perfobond rib Shear Connector is a new type of perfobond rib Shear Connector which has a Y-shape. This study evaluates the behavior of the Y-type perfobond rib Shear Connector which is installed in a composite girder. An analytical model of the proposed Y-type perfobond rib Shear Connector in a composite girder considering the partial composite behavior is developed to evaluate the structural behaviors of the girder. The validity of the analytical model is verified through a loading test on the sample girder. Through analytical and experimental evaluations of a composite girder with either the proposed Y-type perfobond Shear Connectors or the conventional stud Shear Connectors, it is confirmed that the adoption of the Y-type perfobond rib Shear Connector increases the load-carrying capacity of a composite beam as the composite interaction increases; resulting in about 17% increase in both the yield load and the ultimate load. Considering the advantages over the conventional Shear Connectors, such as the Shear resistance, the ductility, the increased load-carrying capacity of composite girder, and the improved workability of rebar, the proposed Y-type perfobond rib Shear Connector can be applied to the various types of composite structures.
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end bearing resistance of y type perfobond rib according to rib width height ratio
Journal of Constructional Steel Research, 2014Co-Authors: Chi Young Jung, Sejun ParkAbstract:Abstract A Y-type perfobond rib Shear Connector has a higher Shear resistance and ductility than a conventional perfobond rib Shear Connector, and can address the issues of low vertical resistance and the constructability of transverse rebars. This study focuses on push-out tests for verifying the performance of Y-type perfobond rib Shear Connectors. These tests are conducted according to the guidance provided in Eurocode-4. Previous studies on Y-type perfobond rib Shear Connectors aimed to verify their Shear performance using parameters such as the concrete strength, the presence of transverse rebar, the thickness of the rib, and the Y-shaped bending angle of the ribs. However, there are scant attempts to clarify the effects from different rib widths and heights. The end-bearing resistance of the Y-type perfobond rib Shear Connector may be determined by the sizes of the rib width and rib height. Therefore, the end-bearing resistance is comparatively analyzed in this study according to the rib widths and rib heights. On the basis of the push-out test results, the Shear resistance equation presented by Kim et al. [14] , [15] are improved. The improved equation is able to more rationally consider the effects from various rib shape factors and compressive strengths of concrete.
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experimental Shear resistance evaluation of y type perfobond rib Shear Connector
Journal of Constructional Steel Research, 2013Co-Authors: Sang Hyo Kim, Sejun Park, Kyu Tae Choi, Seungmin Park, Chi Young JungAbstract:Abstract Recently due to the increase in the construction of the steel–concrete composite structures, researches on Shear Connector which is capable of composite behavior of two members have been widely studied. This study evaluated the behavior of Y-type perfobond rib Shear Connector which is superior in Shear resistance and ductility than conventional perfobond rib Shear Connector. Also, it suggested a Shear resistance equation based on the push-out test. Firstly, various types of the proposed Y-type perfobond rib Shear Connectors have been examined to evaluate the effect on design variables such as strength of concrete, transverse rebar, thickness of rib, and Y-shape angle. As a result, the experiment showed that the higher the concrete strength, the Shear resistance increased, while ductility decreased. In addition, transverse rebar significantly impacted both Shear resistance and ductility to increase. Moreover, as thickness of ribs increased, Shear resistance increased and ductility decreased. It was also proven that Y-shape angle has an effect on Shear resistance and ductility to grow. Furthermore, it was indicated that Y-type perfobond rib Shear Connector has higher Shear resistance and ductility than the conventional perfobond rib Shear Connector by comparing and estimating the experimental results. Lastly, the effect of bearing resistance, transverse rebar, dowel resistance by holes, and dowel resistance by Y-shape ribs on Shear resistance was estimated by regression analysis. Through the result, the Shear resistance equation was suggested to predict Shear resistance of Y-type perfobond Shear Connector.
Sejun Park - One of the best experts on this subject based on the ideXlab platform.
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Development of a skewed pipe Shear Connector for precast concrete structures
Materials, 2017Co-Authors: Sang Hyo Kim, Sejun Park, Jae-gu Choi, Hyunmin Lee, And Won-ho HeoAbstract:Joint connection methods, such as Shear key and loop bar, improve the structural performance of precast concrete structures; consequently, there is usually decreased workability or constructional efficiency. This paper proposes a high-efficiency skewed pipe Shear Connector. To resist Shear and pull-out forces, the proposed Connectors are placed diagonally between precast concrete segments and a cast-in-place concrete joint part on a girder. Design variables (such as the pipe diameter, length, and insertion angle) have been examined to investigate the connection performance of the proposed Connector. The results of our testing indicate that the skewed pipe Shear Connectors have 50% higher ductility and a 15% higher ratio of maximum load to yield strength as compared to the corresponding parameters of the loop bar. Finite element analysis was used for validation. The resulting validation indicates that, compared to the loop bar, the skewed pipe Shear Connector has a higher ultimate Shear and pull-out resistance. These results indicate that the skewed pipe Shear Connector demonstrates more idealized behavior than the loop bar in precast concrete structures.
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End-bearing resistance of Y-type perfobond rib according to rib width–height ratio
Journal of Constructional Steel Research, 2014Co-Authors: Chi Young Jung, Sejun ParkAbstract:Abstract A Y-type perfobond rib Shear Connector has a higher Shear resistance and ductility than a conventional perfobond rib Shear Connector, and can address the issues of low vertical resistance and the constructability of transverse rebars. This study focuses on push-out tests for verifying the performance of Y-type perfobond rib Shear Connectors. These tests are conducted according to the guidance provided in Eurocode-4. Previous studies on Y-type perfobond rib Shear Connectors aimed to verify their Shear performance using parameters such as the concrete strength, the presence of transverse rebar, the thickness of the rib, and the Y-shaped bending angle of the ribs. However, there are scant attempts to clarify the effects from different rib widths and heights. The end-bearing resistance of the Y-type perfobond rib Shear Connector may be determined by the sizes of the rib width and rib height. Therefore, the end-bearing resistance is comparatively analyzed in this study according to the rib widths and rib heights. On the basis of the push-out test results, the Shear resistance equation presented by Kim et al. [14] , [15] are improved. The improved equation is able to more rationally consider the effects from various rib shape factors and compressive strengths of concrete.
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Behavior of composite girder with Y-type perfobond rib Shear Connectors
Journal of Constructional Steel Research, 2014Co-Authors: Sang Hyo Kim, Sejun Park, Jae-gu Choi, Jin Hee Ahn, Chi Young JungAbstract:Abstract A Y-type perfobond rib Shear Connector is a new type of perfobond rib Shear Connector which has a Y-shape. This study evaluates the behavior of the Y-type perfobond rib Shear Connector which is installed in a composite girder. An analytical model of the proposed Y-type perfobond rib Shear Connector in a composite girder considering the partial composite behavior is developed to evaluate the structural behaviors of the girder. The validity of the analytical model is verified through a loading test on the sample girder. Through analytical and experimental evaluations of a composite girder with either the proposed Y-type perfobond Shear Connectors or the conventional stud Shear Connectors, it is confirmed that the adoption of the Y-type perfobond rib Shear Connector increases the load-carrying capacity of a composite beam as the composite interaction increases; resulting in about 17% increase in both the yield load and the ultimate load. Considering the advantages over the conventional Shear Connectors, such as the Shear resistance, the ductility, the increased load-carrying capacity of composite girder, and the improved workability of rebar, the proposed Y-type perfobond rib Shear Connector can be applied to the various types of composite structures.
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end bearing resistance of y type perfobond rib according to rib width height ratio
Journal of Constructional Steel Research, 2014Co-Authors: Chi Young Jung, Sejun ParkAbstract:Abstract A Y-type perfobond rib Shear Connector has a higher Shear resistance and ductility than a conventional perfobond rib Shear Connector, and can address the issues of low vertical resistance and the constructability of transverse rebars. This study focuses on push-out tests for verifying the performance of Y-type perfobond rib Shear Connectors. These tests are conducted according to the guidance provided in Eurocode-4. Previous studies on Y-type perfobond rib Shear Connectors aimed to verify their Shear performance using parameters such as the concrete strength, the presence of transverse rebar, the thickness of the rib, and the Y-shaped bending angle of the ribs. However, there are scant attempts to clarify the effects from different rib widths and heights. The end-bearing resistance of the Y-type perfobond rib Shear Connector may be determined by the sizes of the rib width and rib height. Therefore, the end-bearing resistance is comparatively analyzed in this study according to the rib widths and rib heights. On the basis of the push-out test results, the Shear resistance equation presented by Kim et al. [14] , [15] are improved. The improved equation is able to more rationally consider the effects from various rib shape factors and compressive strengths of concrete.
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experimental Shear resistance evaluation of y type perfobond rib Shear Connector
Journal of Constructional Steel Research, 2013Co-Authors: Sang Hyo Kim, Sejun Park, Kyu Tae Choi, Seungmin Park, Chi Young JungAbstract:Abstract Recently due to the increase in the construction of the steel–concrete composite structures, researches on Shear Connector which is capable of composite behavior of two members have been widely studied. This study evaluated the behavior of Y-type perfobond rib Shear Connector which is superior in Shear resistance and ductility than conventional perfobond rib Shear Connector. Also, it suggested a Shear resistance equation based on the push-out test. Firstly, various types of the proposed Y-type perfobond rib Shear Connectors have been examined to evaluate the effect on design variables such as strength of concrete, transverse rebar, thickness of rib, and Y-shape angle. As a result, the experiment showed that the higher the concrete strength, the Shear resistance increased, while ductility decreased. In addition, transverse rebar significantly impacted both Shear resistance and ductility to increase. Moreover, as thickness of ribs increased, Shear resistance increased and ductility decreased. It was also proven that Y-shape angle has an effect on Shear resistance and ductility to grow. Furthermore, it was indicated that Y-type perfobond rib Shear Connector has higher Shear resistance and ductility than the conventional perfobond rib Shear Connector by comparing and estimating the experimental results. Lastly, the effect of bearing resistance, transverse rebar, dowel resistance by holes, and dowel resistance by Y-shape ribs on Shear resistance was estimated by regression analysis. Through the result, the Shear resistance equation was suggested to predict Shear resistance of Y-type perfobond Shear Connector.
Sang Hyo Kim - One of the best experts on this subject based on the ideXlab platform.
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Development of a skewed pipe Shear Connector for precast concrete structures
Materials, 2017Co-Authors: Sang Hyo Kim, Sejun Park, Jae-gu Choi, Hyunmin Lee, And Won-ho HeoAbstract:Joint connection methods, such as Shear key and loop bar, improve the structural performance of precast concrete structures; consequently, there is usually decreased workability or constructional efficiency. This paper proposes a high-efficiency skewed pipe Shear Connector. To resist Shear and pull-out forces, the proposed Connectors are placed diagonally between precast concrete segments and a cast-in-place concrete joint part on a girder. Design variables (such as the pipe diameter, length, and insertion angle) have been examined to investigate the connection performance of the proposed Connector. The results of our testing indicate that the skewed pipe Shear Connectors have 50% higher ductility and a 15% higher ratio of maximum load to yield strength as compared to the corresponding parameters of the loop bar. Finite element analysis was used for validation. The resulting validation indicates that, compared to the loop bar, the skewed pipe Shear Connector has a higher ultimate Shear and pull-out resistance. These results indicate that the skewed pipe Shear Connector demonstrates more idealized behavior than the loop bar in precast concrete structures.
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Behavior of composite girder with Y-type perfobond rib Shear Connectors
Journal of Constructional Steel Research, 2014Co-Authors: Sang Hyo Kim, Sejun Park, Jae-gu Choi, Jin Hee Ahn, Chi Young JungAbstract:Abstract A Y-type perfobond rib Shear Connector is a new type of perfobond rib Shear Connector which has a Y-shape. This study evaluates the behavior of the Y-type perfobond rib Shear Connector which is installed in a composite girder. An analytical model of the proposed Y-type perfobond rib Shear Connector in a composite girder considering the partial composite behavior is developed to evaluate the structural behaviors of the girder. The validity of the analytical model is verified through a loading test on the sample girder. Through analytical and experimental evaluations of a composite girder with either the proposed Y-type perfobond Shear Connectors or the conventional stud Shear Connectors, it is confirmed that the adoption of the Y-type perfobond rib Shear Connector increases the load-carrying capacity of a composite beam as the composite interaction increases; resulting in about 17% increase in both the yield load and the ultimate load. Considering the advantages over the conventional Shear Connectors, such as the Shear resistance, the ductility, the increased load-carrying capacity of composite girder, and the improved workability of rebar, the proposed Y-type perfobond rib Shear Connector can be applied to the various types of composite structures.
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experimental Shear resistance evaluation of y type perfobond rib Shear Connector
Journal of Constructional Steel Research, 2013Co-Authors: Sang Hyo Kim, Sejun Park, Kyu Tae Choi, Seungmin Park, Chi Young JungAbstract:Abstract Recently due to the increase in the construction of the steel–concrete composite structures, researches on Shear Connector which is capable of composite behavior of two members have been widely studied. This study evaluated the behavior of Y-type perfobond rib Shear Connector which is superior in Shear resistance and ductility than conventional perfobond rib Shear Connector. Also, it suggested a Shear resistance equation based on the push-out test. Firstly, various types of the proposed Y-type perfobond rib Shear Connectors have been examined to evaluate the effect on design variables such as strength of concrete, transverse rebar, thickness of rib, and Y-shape angle. As a result, the experiment showed that the higher the concrete strength, the Shear resistance increased, while ductility decreased. In addition, transverse rebar significantly impacted both Shear resistance and ductility to increase. Moreover, as thickness of ribs increased, Shear resistance increased and ductility decreased. It was also proven that Y-shape angle has an effect on Shear resistance and ductility to grow. Furthermore, it was indicated that Y-type perfobond rib Shear Connector has higher Shear resistance and ductility than the conventional perfobond rib Shear Connector by comparing and estimating the experimental results. Lastly, the effect of bearing resistance, transverse rebar, dowel resistance by holes, and dowel resistance by Y-shape ribs on Shear resistance was estimated by regression analysis. Through the result, the Shear resistance equation was suggested to predict Shear resistance of Y-type perfobond Shear Connector.
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Shear resistance of the perfobond rib Shear Connector depending on concrete strength and rib arrangement
Journal of Constructional Steel Research, 2010Co-Authors: Jin Hee Ahn, Chan Goo Lee, Jeong Hun Won, Sang Hyo KimAbstract:In this study, a perfobond-rib Shear Connector between steel and concrete mixed girder bridge components is described. Push-out tests were conducted and the results were compared with established Shear-capacity equations for perfobond Shear Connectors. Modified Shear-capacity equations that consider the perfobond-rib arrangement, including rib height and spacing, are proposed. The test results were compared with studies of the concrete end-bearing zone, of transverse rebars in the rib holes, and of the Shear-capacity equations of perfobond ribs. From the push-out tests, the Shear capacity of the perfobond-rib Shear Connector varies in proportion to concrete strength, as indicated by the increase in the contribution to the Shear resistance of the concrete. The ductility of the conductor is related to the flexibility limit of the transverse rebar in the rib hole. The Shear capacity of a twin perfobond-rib Shear Connector was reduced to about 80% that of a single perfobond rib by reducing the Shear capacity contributed by the concrete end-bearing zone, the concrete dowel, and the transverse rebar in the rib hole. The perfobond rib can be used as a Shear Connector in composite or mixed structures since it has sufficient ductility as well as high Shear capacity.
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Shear behaviour of perfobond rib Shear Connector under static and cyclic loadings
Magazine of Concrete Research, 2008Co-Authors: Jin Hee Ahn, Sang Hyo Kim, Y J JeongAbstract:In this study, a series of push-out tests for perfobond rib Shear Connectors were conducted to examine their Shear behaviour under static and cyclic loading. The test specimens were designed to examine the effects of the concrete dowel actions, transverse rebars in the rib holes and cyclic load. The effect of the pure concrete dowel actions was observed as 65% of the static Shear capacity in test specimens without transverse rebars, and the transverse rebars in the rib holes increased the Shear capacity about twofold. After the cyclic load, the residual Shear capacity of specimens without transverse rebars decreased to about 65% that of static Shear capacity. However, the residual Shear resistance of the specimens assembled with transverse rebars did not decrease. Thus, perfobond rib Shear Connector specimens with transverse rebars in their holes show an increase in Shear capacity under cyclic load as well as static load. Therefore, it is considered that if perfobond rib Shear Connectors are used in bridg...
Frank Palas - One of the best experts on this subject based on the ideXlab platform.
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Behavior of a New Type of Shear Connector for U-Shaped Steel-Concrete Hybrid Beams
High Tech Concrete: Where Technology and Engineering Meet, 2018Co-Authors: Pisey Keo, Clémence Lepourry, Hugues Somja, Frank PalasAbstract:Steel-concrete composite beam is an alternative to reduce the construction time and material costs compared to a conventional reinforced or prestressed concrete one when aiming to reach a large span and limiting the height of the cross-section. Composite beam consisting of a concrete beam cased in a U-shaped steel beam has been recently reported in the literature. Such composite beam is cost effective if a thin-walled steel section is used, leading to some difficulties in welding Shear stud Connectors. Another Shear Connector devices have to be used. It is worth mentioning that during concrete encasement, the upper flanges of the U-section have to be linked in order to preserve the shape of the steel cross-section. It is then proposed here to use the linking element as a Shear Connector. This new type of Shear connection is not covered in present norms of composite structures and it requires an investigation on its behavior and on force transfer mechanisms. The experimental investigation of the behavior of these Shear Connectors through asymmetrical push-out tests is presented in this paper. Two different cross-sections of Shear Connectors were considered. A finite element model has been developed in order to identify the stress behavior of Shear Connectors and the surrounding concrete. A good agreement of FEA results and experimental data is obtained. Based on the FEA results, an analytical design formula for Shear Connectors is proposed.
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Behavior of a new Shear Connector for U-shaped steel-concrete hybrid beams
Journal of Constructional Steel Research, 2018Co-Authors: Pisey Keo, Clémence Lepourry, Hugues Somja, Frank PalasAbstract:This paper presents an investigation of the behavior of a new type of Shear Connectors used in U-shaped steel-concrete hybrid beams. Besides the role in transferring the force between concrete and steel material, this new type of Shear Connectors, welded on the upper flange of the U-shaped steel beam, serves to maintain the shape of the steel cross-section during concrete encasement. Several forms of Shear Connectors can be used such as L-shaped or square cross-section. The experimental investigation of the behavior of these Shear Connectors using asymmetrical push-out tests is presented in this paper. A finite element model has been developed in order to identify the stress behavior of the Connectors and the surrounding concrete. The FE model is validated by comparing its results against experimental data and then used to perform a parametric study. Based on the parametric study results, an analytical formula for calculating the force transfer capacity of the Shear Connector is proposed.
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Behavior of a new type of Shear Connector for U-shaped Steel-concrete hybrid beams
2017Co-Authors: Pisey Keo, Clémence Lepourry, Hugues Somja, Frank PalasAbstract:Steel-concrete composite beam is an alternative to reduce the construction time and material costs compared to a conventional reinforced or prestressed concrete one when aiming to reach a large span and limiting the height of the cross-section. Composite beam consisting of a concrete beam cased in a U-shaped steel beam has been recently reported in the literature. Such composite beam is cost effective if a thin-walled steel section is used, leading to some difficulties in welding Shear stud Connectors. Another Shear Connector devices have to be used. It is worth mentioning that during concrete encasement, the upper flanges of the U-section have to be linked in order to preserve the shape of the steel cross-section. It is then proposed here to use the linking element as a Shear Connector. This new type of Shear connection is not covered in present norms of composite structures and it requires an investigation on its behavior and on force transfer mechanisms. The experimental investigation of the behavior of these Shear Connectors through asymmetrical push-out tests is presented in this paper. Two different cross-sections of Shear Connectors were considered. A finite element model has been developed in order to identify the stress behavior of Shear Connectors and the surrounding concrete. A good agreement of FEA results and experimental data is obtained. Based on the FEA results, an analytical design formula for Shear Connectors is proposed. © Springer International Publishing AG 2018.