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Steel and Composite Structures
  Volume 25, Number 1, September20 2017, pages 117-126

Mechanical behavior investigation of steel connections using a modified component method
Shizhe Chen, Jianrong Pan, Hui Yuan, Zhuangning Xie, Zhan Wang and Xian Dong

    The component method is an analytical approach for investigating the moment.rotation relationship of steel connections. In this study, the component method was improved from two aspects: (i) load analysis of mechanical model; and (ii) combination of spring elements. An optimized component method with more reasonable component models, spring arrangement position, and boundary conditions was developed using finite element analysis. An experimental testing program in two major-axis and two minor-axis connections under symmetrically loading was carried out to verify this method. The initial rotational stiffness obtained from the optimized component method was consistent with the experimental results. It can be concluded that (i) The coupling stiffness between column and beam flanges significantly affects the effective height of the tensile-column web. (ii) The mechanical properties of the bending components were obtained using an equivalent t-stub model considering the bending capacity of bolts. (iii) Using the optimized mechanical components, the initial rotational stiffness was accurately calculated using the spring system. (iv) The characteristics of moment.rotation relationship for beam to column connections were effectively expressed by the SPRING element analysis model using ABAQUS. The calculations are simpler, and the results are accurate.
Key Words
    method optimization; component method; rotational stiffness; spring element; major-axis connection; minor-axis connection
(1) Shizhe Chen, Jianrong Pan, Hui Yuan, Zhuangning Xie, Zhan Wang, Xian Dong:
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China;
(2) Shizhe Chen, Jianrong Pan, Zhan Wang:
State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China.

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