Seismic damage model and tests of CFST latticed columns under repeated load

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (19) : 157-163.

HUANG Zhi1,2, CHEN Xiangwen1, JIANG Lizhong3, ZHOU Wangbao3, XIONG Luzeng1, QI Jingjing1

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Abstract

To enable a better understanding of the damage and aseismic performance of these concrete filled steel tubular (CFST) laced columns, four CFST laced columns consisting of 4 main steel-concrete tubes were tested under cyclic loading. Failure modes and damage characteristics were studied based on the results from the lateral cyclic loading tests. Based on the analysis of experiments, the traditional Park-Ang damage was revised. And calculating formulas of damage index and energy dissipation factor, which is suitable for concrete filled steel tubular laced columns in a giant composite structure system, is established. According to the experimental phenomenon and the characteristics of each stage of the specimen through loading to failure, the calculation results among Park-Ang damage model, the energy-based damage model and the revised Park-Ang damage model were compared. The results shows that the damage degree of the concrete-filled steel tube lattice columns can be better evaluated by the improved Park-Ang model, and the damage value could be divided into repairable, unrepairable but undamaged, and unrepairable. The damage value of 0.4 is suggested as the critical value of whether the specimen can be repaired or not.
Key words: mega-composite structure; concrete filled steel tube; experimental study; damage model; laced columns

Key words

mega-composite structure / concrete filled steel tube / experimental study / damage model / laced columns

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HUANG Zhi1,2, CHEN Xiangwen1, JIANG Lizhong3, ZHOU Wangbao3, XIONG Luzeng1, QI Jingjing1. Seismic damage model and tests of CFST latticed columns under repeated load[J]. Journal of Vibration and Shock, 2022, 41(19): 157-163

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