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Second-order improved refined plastic hinge method for high strength steel box-section columns under cyclic loads

Plastic hinge beam-column model is widely used in the direct design method, but it cannot directly simulate the elastic unloading and cumulative damage effect in hysteresis analysis. This paper presents a theoretical study on the cyclic performance of high strength steel box-section columns. Firstly, the second-order effect and the additional axial strain due to the element bending are incorporated in the stiffness matrix formulation of the beam-column element. Then, the plasticity development in box section under axial force and bending moment is analyzed and a practical calculation method for the rotational stiffness of plastic hinges considering the cumulative damage effect is derived. Based on a new hysteresis criterion, an improved refined plastic hinge method is proposed for beam-column element to predict the hysteretic behavior. Existing experimental results of Q460 high strength steel welded box-section columns under cyclic loads are adopted to verify the reasonability and accuracy of the proposed method in which only one element per member is required. The proposed improved refined plastic hinge method is shown to be an efficient tool ready to be implemented into the design practice.

» Author: Yi Zhou, Lingjie Tang, Kaiqi Liu, Bin Hu, Yinglei Li

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