Test study on nonlinear mechanical properties of series isolation components

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (5) : 21-29.

ZHAO Lijie1,2,3, JING Xuanguang2, DU Yongfeng3, SHEN Jinsheng1,2

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Abstract

As a combination of variable stiffness and strong nonlinear components, series isolation members are the most vulnerable and sensitive parts of column top isolation structures.In order to have a deeper understanding of the nonlinear mechanical properties of the series isolation members, this paper carried out pseudo-static loading tests on the series isolation members with different slenderness ratios and axial compression ratios, and analyzed the failure phenomenon and characteristics of the series isolation members with different slenderness ratios and axial compression ratios.The effects of slenderness ratio and axial pressure ratio on the horizontal stiffness, strength, force and displacement relations of series isolation components were analyzed, and the evolution law of mechanical properties of series isolation components caused by nonlinear cumulative damage under multiple real-time reciprocating loads was investigated. The analysis of test results shows that ductility, energy dissipation capacity and ultimate displacement of components are negatively correlated with slenderness ratio and axial compression ratio and show obvious nonlinear characteristics. The increase of slenderness ratio and axial compression ratio will cause damage and deterioration of some nonlinear mechanical properties such as horizontal stiffness and strength of series isolation components.

Key words

series isolation member / quasi static test / nonlinear

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ZHAO Lijie1,2,3, JING Xuanguang2, DU Yongfeng3, SHEN Jinsheng1,2. Test study on nonlinear mechanical properties of series isolation components[J]. Journal of Vibration and Shock, 2023, 42(5): 21-29

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