Study on Seismic Behavior of Unstiffened Circular Hollow Section KK-joints under Out-of-plane Bending

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Study on Seismic Behavior of Unstiffened Circular Hollow Section KK-joints under Out-of-plane Bending

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[1]ZHAO Bida,CAI Yangzheng,YAO Zeyang.Study on Seismic Behavior of Unstiffened Circular Hollow Section KK-joints under Out-of-plane Bending[J].Journal of Zhengzhou University (Engineering Science),2021,42(02):7-12.[doi:10.13705/j.issn.1671-6833.2021.02.012]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 42 Number of periods: 2021 02 Page number: 7-12 Column: Public date: 2021-04-12

Title:: Study on Seismic Behavior of Unstiffened Circular Hollow Section KK-joints under Out-of-plane Bending

Author(s):: ZHAO Bida; CAI Yangzheng; YAO Zeyang; School of Civil Engineering, Zhejiang University of Technology;

Keywords:: unstiffened circular hollow section(CHS) KK-joints; unstiffened CHS X-joints; out-of-plane flexural seismic behavior; ductility; energy dissipation

CLC:: -

DOI:: 10.13705/j.issn.1671-6833.2021.02.012

Abstract:: To study the out-of-plane bending seismic behavior of Unstiffened circular hollow section (CHS) KK-joints, an out-of-plane bending cyclic loading test was performed. Moreover, the test results of the KK-joints were compared with the existing test results of the corresponding X-joints (with same tubular dimension and material of the KK-joints), to investigate the seismic performance difference between the KK-joints and the X-joints. Additionally, the performance difference was further interpreted by the load-carrying mechanism analysis. The results showed that the failure mode of the KK-joints was chord wall crack after plasticizing, and the resistance decreases slowly after cracking. The energy dissipated of the KK-joints mainly relied on plastic deformation and crack propagation of the chord wall. The ductility ratio of the KK-joints was large than 6, which demonstrated excellent deformability and seismic behavior. It also found that the stress characteristics of the adjacent brace interaction made the out-of-plane flexural strength of KK-joints about 23% lower than that of the corresponding X-joints, but close to the value calculated by the predict equation of CHS X-joints of the EC3 specification. Moreover, the results of load-carrying mechanism analysis and FE analysis showed that the joint-zone of the KK-joints and the X-joints were subjected to tension in the four corners and in two diagonal directions respectively. Therefore, the KK-joints would develop more uniform and extensive plastic at joint-zone than that of X-joints. The comparison of test results between the two type joints also showed that the deformability, ductility, and energy dissipation of the KK-joints were also better than that of the corresponding X-joints.

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