The Experts below are selected from a list of 2007 Experts worldwide ranked by ideXlab platform
Kitae Park - One of the best experts on this subject based on the ideXlab platform.
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shear resistance evaluation of steel grid composite Deck Joint
Journal of the Korea Academia Industrial Cooperation Society, 2013Co-Authors: Hyun-seop Shin, Kitae ParkAbstract:Abstract In order to apply a mechanical Deck Joint to the prefabricated steel grid composite Decks, shear resistance of a Joint composed of concrete shear key and high-tension bolt is experimentally evaluated by the push-out test. Shear resistance evaluated by the test is compared with resistance estimated by empirical and design equations based on the shear friction theory. Test results show that Joint specimens bonded by epoxy have about 10% more shear resistance than specimens with strengthened shear key by steel plates, but in the case of specimens with strengthened shear key there is smaller resistance deviation than specimens bonded by epoxy. In comparison with resistances estimated by empirical and design equations, the Deck Joint can be safely designed. But because the existed shear resistance of Deck Joint is underestimated by the ACI-318, application of the LRFD design equation could be more reasonable. Key Words : Deck Joint, Push-out test, Shear resistance, Steel grid composite Deck
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evaluation of the bending performance of a modified steel grid composite Deck Joint
Journal of the Korea institute for structural maintenance and inspection, 2013Co-Authors: Hyun-seop Shin, Kitae ParkAbstract:For the Joint connection of the precast steel grid composite Decks, the prefabricated Joint which is composed of concrete shear key and high-tension bolts was already proposed. In this study, for the purpose of increasing the bending stiffness and bending strength of the proposed prefabricated Joint section details of the proposed Joint are modified, and through experimental tests the bending performance, such as stiffness and strength of a modified Joint, is compared with those of the proposed Joint. Test and analysis results show that the shear cracks in the concrete shear key are clearly reduced by the strengthening of the shear key using shear studs and additional rebars. According to analysis results of the moment-curvature relationship, bending stiffness of the modified Joint is about 47% greater than the stiffness of the proposed Joint. Furthermore, the modified Joint has about 32% greater bending strength than the proposed Joint. Compared to specimens without the Joint the modified Joint has same or slightly higher bending strength, but about 37% lower bending stiffness.
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an experimental study on bending behaviour of steel grid composite Deck Joint
Journal of the Korea institute for structural maintenance and inspection, 2012Co-Authors: Hyun-seop Shin, Kitae ParkAbstract:The Joint of existing steel grid composite Deck is composed of lap splice of reinforcing bar with end hooks and field-placed concrete. In this study, bending tests of Deck Joint composed of concrete shear key and high tension bolts are carried out for the design variable, concrete shear key strengthened with steel plate or not, and test results are compared with flexural performance of the existing Deck Joint. Test results showed that the mechanical Deck Joint has about 30% ~ 60% more ultimate bending strength than the existing Joint. According to analysis results of moment-curvature relationship, the initial bending stiffness of the existing Deck Joint is some higher than that of mechanical Joint. But, after crack failure the structural performance of the existing Deck Joint is rapidly reduced. Furthermore, the Deck Joint with the strengthened shear key with steel plate has more bending moment capacity than the Deck Joint without strengthening. And strengthening of shear key has positive influence on the increase of bending stiffness.
Ping Wang - One of the best experts on this subject based on the ideXlab platform.
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traction structural stress analysis of fatigue behaviors of rib to Deck Joints in orthotropic bridge Deck
International Journal of Fatigue, 2019Co-Authors: Pingsha Dong, Ping Wang, Shaopin SongAbstract:Abstract In this study, a traction stress method is adopted for analyzing some of the unique fatigue behaviors observed in a series of recent experimental studies on rib-to-Deck Joints in orthotropic steel bridge Decks. It is found that the traction-based structural stress definition is not only effective for describing the relevant stress state responsible for each of the four fatigue failure modes, but also mesh-insensitive in finite element computation. The latter attribute is essential for achieving a reliable evaluation of the most likely failure mode possible out of four typical failure modes for a given Joint design (including exact weld dimensions) under specified loading conditions. As such, effective means of avoiding undesirable failure mode, e.g., Type 4 (i.e., weld root cracking), can be examined, e.g., by increasing either weld fillet size and/or weld penetration. Furthermore, the rib-to-Deck Joint fatigue test data investigated in this study are shown falling within the scatter band of the traction stress based master S-N curve adopted by ASME Div Code since 2007, implying that data transferability exists among these three sets of test data obtained independently by different laboratories.
Shaopin Song - One of the best experts on this subject based on the ideXlab platform.
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traction structural stress analysis of fatigue behaviors of rib to Deck Joints in orthotropic bridge Deck
International Journal of Fatigue, 2019Co-Authors: Pingsha Dong, Ping Wang, Shaopin SongAbstract:Abstract In this study, a traction stress method is adopted for analyzing some of the unique fatigue behaviors observed in a series of recent experimental studies on rib-to-Deck Joints in orthotropic steel bridge Decks. It is found that the traction-based structural stress definition is not only effective for describing the relevant stress state responsible for each of the four fatigue failure modes, but also mesh-insensitive in finite element computation. The latter attribute is essential for achieving a reliable evaluation of the most likely failure mode possible out of four typical failure modes for a given Joint design (including exact weld dimensions) under specified loading conditions. As such, effective means of avoiding undesirable failure mode, e.g., Type 4 (i.e., weld root cracking), can be examined, e.g., by increasing either weld fillet size and/or weld penetration. Furthermore, the rib-to-Deck Joint fatigue test data investigated in this study are shown falling within the scatter band of the traction stress based master S-N curve adopted by ASME Div Code since 2007, implying that data transferability exists among these three sets of test data obtained independently by different laboratories.
Hyun-seop Shin - One of the best experts on this subject based on the ideXlab platform.
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shear resistance evaluation of steel grid composite Deck Joint
Journal of the Korea Academia Industrial Cooperation Society, 2013Co-Authors: Hyun-seop Shin, Kitae ParkAbstract:Abstract In order to apply a mechanical Deck Joint to the prefabricated steel grid composite Decks, shear resistance of a Joint composed of concrete shear key and high-tension bolt is experimentally evaluated by the push-out test. Shear resistance evaluated by the test is compared with resistance estimated by empirical and design equations based on the shear friction theory. Test results show that Joint specimens bonded by epoxy have about 10% more shear resistance than specimens with strengthened shear key by steel plates, but in the case of specimens with strengthened shear key there is smaller resistance deviation than specimens bonded by epoxy. In comparison with resistances estimated by empirical and design equations, the Deck Joint can be safely designed. But because the existed shear resistance of Deck Joint is underestimated by the ACI-318, application of the LRFD design equation could be more reasonable. Key Words : Deck Joint, Push-out test, Shear resistance, Steel grid composite Deck
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evaluation of the bending performance of a modified steel grid composite Deck Joint
Journal of the Korea institute for structural maintenance and inspection, 2013Co-Authors: Hyun-seop Shin, Kitae ParkAbstract:For the Joint connection of the precast steel grid composite Decks, the prefabricated Joint which is composed of concrete shear key and high-tension bolts was already proposed. In this study, for the purpose of increasing the bending stiffness and bending strength of the proposed prefabricated Joint section details of the proposed Joint are modified, and through experimental tests the bending performance, such as stiffness and strength of a modified Joint, is compared with those of the proposed Joint. Test and analysis results show that the shear cracks in the concrete shear key are clearly reduced by the strengthening of the shear key using shear studs and additional rebars. According to analysis results of the moment-curvature relationship, bending stiffness of the modified Joint is about 47% greater than the stiffness of the proposed Joint. Furthermore, the modified Joint has about 32% greater bending strength than the proposed Joint. Compared to specimens without the Joint the modified Joint has same or slightly higher bending strength, but about 37% lower bending stiffness.
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an experimental study on bending behaviour of steel grid composite Deck Joint
Journal of the Korea institute for structural maintenance and inspection, 2012Co-Authors: Hyun-seop Shin, Kitae ParkAbstract:The Joint of existing steel grid composite Deck is composed of lap splice of reinforcing bar with end hooks and field-placed concrete. In this study, bending tests of Deck Joint composed of concrete shear key and high tension bolts are carried out for the design variable, concrete shear key strengthened with steel plate or not, and test results are compared with flexural performance of the existing Deck Joint. Test results showed that the mechanical Deck Joint has about 30% ~ 60% more ultimate bending strength than the existing Joint. According to analysis results of moment-curvature relationship, the initial bending stiffness of the existing Deck Joint is some higher than that of mechanical Joint. But, after crack failure the structural performance of the existing Deck Joint is rapidly reduced. Furthermore, the Deck Joint with the strengthened shear key with steel plate has more bending moment capacity than the Deck Joint without strengthening. And strengthening of shear key has positive influence on the increase of bending stiffness.
Xiao Ling Zhao - One of the best experts on this subject based on the ideXlab platform.
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stress analyses and fatigue evaluation of rib to Deck Joints in steel orthotropic Decks
International Journal of Fatigue, 2008Co-Authors: Zhigang Xiao, Samol Ya, Kentaro Yamada, Xiao Ling ZhaoAbstract:The transverse distribution of wheel loads in orthotropic Decks generates significant out-of-plane bending moments in the Deck plate and rib wall at the rib-to-Deck Joint. Due to the relatively small thickness of both the Deck plate and rib wall, the out-of-plane bending moments result in high local flexural stresses causing fatigue cracks to develop at the Joint. In this study, the transverse stresses within the Joint region that arise under the action of wheel loads are investigated with finite element analyses. Based on the stress results and the basic theories of linear elastic fracture mechanics, the design fatigue strength is determined for the Joint. Factors affecting the stress range are also studied. The analyses show that the surface stresses in the Deck plate are much larger than those in the rib wall in the case of 75% weld penetration into the rib wall, indicating that the fatigue strength of the Joint is governed by the fatigue cracks propagating into the thickness of Deck plate. It is also shown with finite element analyses that increasing the distribution area of wheel load or the thickness of Deck plate can reduce the stress range of the Deck plate and increase significantly the fatigue life of the Joint.
