Experimental and finite element research on seismic performance of replaceable links considering the short length ratios

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 31-42.

XIONG Liquan1，PAN Xingyue1，CHENG Longfei1，MEN Jinjie2，CHEN Dagang3，XIANG Zhengyu3

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Abstract

Compared with the traditional frame structures, the novel frame structure with replaceable links can realize the rapid recovery of building occupancy after seismic input, so they are capable of reducing structural damage and ensuring continued use of the structure. In order to study the seismic performance of the replaceable links, a total of four test specimens were designed. Then a low-cycle reversed loading test was carried out to focus on the failure characteristics, hysteretic performance and skeleton curves. ABAQUS was used for establishing the refined analysis model of the replaceable links to evaluate the change rule of seismic performance of the links by the link short length ratios and analyse the reliability of numerical simulation analysis method. The results indicated that the failure modes of specimens included two types of shear failure and bending-shear failure, those of which included web-to-stiffener weld tear, web buckling and flange-to-end plate weld tear. All tested specimens presented very stable seismic performance and replaceability. The numerical analysis results agreed well with the experimental results and the simulation method is feasible. Along with an increase of the link short length ratios, the bearing capacity, deformation and energy dissipation capacity of the specimens weaken, respectively; at the same time, the shear contribution of flanges for the link models developed beyond 10% of the plastic shear strength. The shear failure mode of the specimens changed to bending-shear behavior reached approximately 1.4, lower than a value of 1.6 recommended by Popov et al. The calculation formula of shear capacity of the replaceable links after earthquake is put forward, which can be used for design evaluation of engineering.

Key words

short length ratio / replaceable link / quasi-static test / finite element analysis / seismic performance / shear

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XIONG Liquan1，PAN Xingyue1，CHENG Longfei1，MEN Jinjie2，CHEN Dagang3，XIANG Zhengyu3. Experimental and finite element research on seismic performance of replaceable links considering the short length ratios[J]. Journal of Vibration and Shock, 2023, 42(10): 31-42

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