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Research on Restoring Force Modeling of Concrete-filled Steel Tubular Special-shaped Column-steel Beam Nodes
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[1]ZHAO Yi,DUAN Songfu,NIU Zhonghao.Research on Restoring Force Modeling of Concrete-filled Steel Tubular Special-shaped Column-steel Beam Nodes[J].Journal of Zhengzhou University (Engineering Science),2022,43(06):104-110.[doi:10.13705/j.issn.1671-6833.2022.06.012]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 06 Page number: 104-110 Column: Public date: 2022-09-02
Title:
Research on Restoring Force Modeling of Concrete-filled Steel Tubular Special-shaped Column-steel Beam Nodes
Author(s):
ZHAO Yi1;  DUAN Songfu1;  NIU Zhonghao1; 2
1.School of Architecture and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 451191, China; 
2.Department of Civil & Environmental Engineering, Brunel University London, London UB8 3PH, the United Kingdom
Keywords:
special-shaped;  concrete-filled steel tubular (CFST);  node;  hysteresis curve;  restoring force model
CLC:
TU399
DOI:
10.13705/j.issn.1671-6833.2022.06.012
Abstract:
In order to achieve the seismic performance and overall aesthetic feature of special-shaped concrete-filled steel tubular column joints, a new side plate connecting T-shaped steel tubular special-shaped column-steel beam node was proposed. The experimental study of seven T-shaped concrete-filled steel tubular column-steel beam joints with side plates under low cyclic loading was carried out. The influencing factors such as the presence or absence of side plates, the length of side plates, the presence or absence of restrained tie rods, and the axial compression ratio were examined. The failure process of the node was observed, the hysteresis curve and skeleton curve of specimens were recorded. The experimental results showed that the failure modes of specimens were divided into beam hinge failure with side plates connection specimens and column hinge failure without side plates connection specimens. The hysteretic curve of the new type of concrete-filled steel tubular column and steel beam joints connected by side plates were full and the seismic performance was well. Based on experimental results, the limit load and its corresponding displacement for dimensionless processing was used to obtain the three fold skeleton curve model, all the specimens′ stiffness degradation law and hysteresis curve paths were analyzed, and the restoring force model of the new T-shaped concrete-filled steel tubular column-steel beam joint was established, contrast experimental results verified the correctness of the proposed restoring force model.The finding of this study a foundation for the in-depth study of the seismic performance of such joints.
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