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Semi-rigidity Connection Model for Unstiffened CHS X-type Joints Subjected Out-of-plane Bending

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Abstract

Mechanical performance of unstiffened circular hollow section (CHS) multi-planar X-joints subjected two different directions (sagging and hogging) of out-of-plane bending moment (OPBM) was analyzed. A seven-parameter exponential function model, which describing semi-rigidity behavior (moment-rotation curves) of the X-joints subjected sagging and hogging OPBM, was proposed, and then the method to obtain the values of each parameters in the seven- parameter model was also proposed. Based on the results of FE parametric analysis, formulas for parameters in the seven-parameter model were established combined with multiple nonlinear regression analysis. FE and test results were used to verified the seven-parameter model. The results indicated that: the seven-parameter model can well reflect the semi-rigidity behavior of CHS multi-planar X-joints subjected to OPBM.

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Acknowledgements

The financial support from the Zhejiang Provincial Natural Science Foundation (LY16E080012), the National Natural Science Foundation of China (No.51778538, No.51278428), the China Scholarship Council (No. 201708330384, No.201707005100),and the Sichuan Province Key Research Project (No.2017JY0035, No.17ZA0391 and No.18ZA0413) are acknowledged and sincerely appreciated by the authors. The authors sincerely acknowledge the anonymous reviewers for their constructive suggestions, which significantly improve the quality of this paper.

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Authors and Affiliations

  1. College of Building Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Bida Zhao & Yangzheng Cai

  2. School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Chengqing Liu, Zhengxi Yan & Xin Chen

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  1. Bida Zhao
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  2. Chengqing Liu
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  4. Xin Chen
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  5. Yangzheng Cai
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Correspondence to Chengqing Liu.

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Zhao, B., Liu, C., Yan, Z. et al. Semi-rigidity Connection Model for Unstiffened CHS X-type Joints Subjected Out-of-plane Bending. Int J Steel Struct 19, 834–849 (2019). https://doi.org/10.1007/s13296-018-0168-x

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