TY - JOUR
T1 - Mechanical behavior of an innovative steel–concrete joint for long-span railway hybrid box girder cable-stayed bridges
AU - Yao, Yadong
AU - Yan, Meng
AU - Shi, Zhou
AU - Wang, Yan
AU - Bao, Yi
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7/15
Y1 - 2021/7/15
N2 - This research proposes an innovative steel–concrete joint, which utilizes front and rear bearing plates and concrete filled steel cells, for long-span railway hybrid box girder cable-stayed bridges. This study investigates the mechanical behavior of the steel–concrete joint through a model test and finite element analysis, aiming to understand the stress distributions, shear lag effects, deformations, and force transfer pathway of the joint under axial and shear loads. A large-scale model (scale: 1/5) was designed following the similarity theory. The model was fabricated and tested under representative load cases. Based on the model test, a three-dimensional finite element model was established and validated using the model test results. Then, the finite element model was utilized to perform a parametric study on the effects of the length of the joint, the thickness of the bearing plates, the height of steel cells, and the stiffness of shear connectors. The results show that the proposed steel–concrete joint provides desired stress distribution and force transfer behavior, in terms of the force transfer rate and uniformity. In the composite section of the joint, the rear bearing plate transfers 57% the total axial force. This study is expected to promote the design and applications of hybrid girders.
AB - This research proposes an innovative steel–concrete joint, which utilizes front and rear bearing plates and concrete filled steel cells, for long-span railway hybrid box girder cable-stayed bridges. This study investigates the mechanical behavior of the steel–concrete joint through a model test and finite element analysis, aiming to understand the stress distributions, shear lag effects, deformations, and force transfer pathway of the joint under axial and shear loads. A large-scale model (scale: 1/5) was designed following the similarity theory. The model was fabricated and tested under representative load cases. Based on the model test, a three-dimensional finite element model was established and validated using the model test results. Then, the finite element model was utilized to perform a parametric study on the effects of the length of the joint, the thickness of the bearing plates, the height of steel cells, and the stiffness of shear connectors. The results show that the proposed steel–concrete joint provides desired stress distribution and force transfer behavior, in terms of the force transfer rate and uniformity. In the composite section of the joint, the rear bearing plate transfers 57% the total axial force. This study is expected to promote the design and applications of hybrid girders.
KW - Cable-stayed railway bridge
KW - Composite section
KW - Force transfer
KW - Hybrid section
KW - Steel–concrete joint
KW - Stress distribution
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U2 - 10.1016/j.engstruct.2021.112358
DO - 10.1016/j.engstruct.2021.112358
M3 - Article
AN - SCOPUS:85104144585
SN - 0141-0296
VL - 239
JO - Engineering Structures
JF - Engineering Structures
M1 - 112358
ER -