Mechanical mechanism of replaceable energy-dissipated piers at the bottom of a new type of steel portal bridge piers
LUO Jiexin1, LI Haifeng1,2, LUO Jun1, NAN Zisen1, SUN Wei1
1. College of Civil Engineering, Huaqiao University, Xiamen 361021, China;
2. Key Laboratory for Structure Engineering and Disaster Prevention of Fujian Province, Xiamen 361021, China
Abstract:In order to investigate the seismic performance of a new type of steel portal bridge piers, the mechanical mechanism of steel box piers with replaceable low yield point stiffening ribs under cyclic axial load was discussed.The finite element analysis software ANSYS was used to establish the numerical models of steel box piers with no stiffener as well as with three different types of stiffeners.The numerical results are in agreement with the axial compression experimental results, which verifies the reliability of the finite element models.Furthermore, the effects of the low yield point steel plate’s height, width and thickness and the stiffener’s thickness, width and quantity on the mechanical behaviors of steel box piers were analyzed by comparing the mechanical behaviors of the specimens in numerical analysis,such as the skeleton curves, displacement ductility coefficient and energy dissipation capacity under cyclic axial load.The results show that the load-bearing capacity of steel box piers with stiffening ribs is increased under cyclic axial load.Setting cross-shaped stiffeners or octothorpe-shaped stiffeners can increase the ductility and energy dissipation capacity of steel box piers.
骆杰鑫1,李海锋1,2,罗俊1,南子森1,孙伟1. 可恢复功能的门式钢桥墩根部耗能墩柱受力机理研究[J]. 振动与冲击, 2019, 38(14): 223-233.
LUO Jiexin1, LI Haifeng1,2, LUO Jun1, NAN Zisen1, SUN Wei1. Mechanical mechanism of replaceable energy-dissipated piers at the bottom of a new type of steel portal bridge piers. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(14): 223-233.
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