Design of New Self-Resetting Negative Stiffness Mechanism for Shock Absorption Based on Finite Element Method

Abstract

In order to further improve the seismic performance of the existing negative stiffness mechanism, an improved self-resetting negative stiffness mechanism with auxiliary energy dissipation elements parallel to the pre-pressure spring is developed. By summarizing the research status of self-reset energy dissipation brace, the basic structure and working principle of the brace are described. Based on the quasi-static test results of the brace specimens, the finite element modelling and numerical analysis of hysteretic performance of self-reset energy dissipation brace are carried out, and the relevant design parameters of the brace are analyzed. At the same time, focusing on the actual seismic reduction and reinforcement projects, the finite element simulation method is used to conduct a comprehensive study on the analysis method and seismic effect of energy dissipation structures with self-resetting energy dissipation braces. The results show that the stiffness of preloading spring not only affects the development process of negative stiffness on structural weakening and vibration reduction, but also affects the effect of strengthening self-reset of structure after decompression. The design value of preloading displacement only affects the development process of structural weakening and seismic reduction with negative stiffness. The auxiliary energy dissipation elements parallel to the pre-loaded spring can provide the ability to dissipate seismic energy. In this way, the seismic absorption effect of the structure can be further enhanced. Therefore, the improved self-resetting negative stiffness mechanism achieves the performance design goal of organic unification of shock absorption, energy dissipation capacity and self-resetting effect.