高静低动刚度型三维隔震系统的#br# 力学性能和地震响应研究

文章提出一种具有高静低动刚度特性(High-Static-Low-Dynamic Stiffness, HSLD)的新型三维隔震系统，由能提供正刚度并具有较大承载能力的斜置橡胶支座和提供负刚度的负刚度装置构成，静载阶段主要由斜置支座提供较大刚度以控制静位移，动载阶段由正负刚度装置联合实现较小隔震刚度减小加速度响应，克服了传统三维隔震支座低隔震刚度与高承载能力的矛盾。进一步对斜置橡胶支座和负刚度装置进行变形分析，得到正负刚度装置力学模型和参数关系，并开展斜置橡胶支座和负刚度装置的静力试验，建立斜置橡胶支座和负刚度装置的理论力学模型。将所提出的HSLD隔震系统应用于建筑结构，通过分析不同水准地震下的结构动力响应，发现HSLD隔震系统适应不同水准抗震性能设计需求，整体结构的静载位移和地震响应均可得到有效控制。

Study on mechanical performance and seismic response of high-static #br# low-dynamic stiffness three-dimensional isolation system

 In this work, a new type of three-dimensional isolation system with high static and low dynamic stiffness (HSLD) characteristics is proposed. The HSLD isolation system is composed of the inclined rubber bearings with large load capacity providing positive stiffness and the devices providing negative stiffness. In the static stage, the inclined rubber bearing is used to provide enough stiffness to control the static displacement, while in the dynamic stage the positive and negative stiffness devices are combined to achieve small isolation stiffness and reduce the acceleration response, resolving the conflict of low isolation stiffness and high bearing capacity of three-dimensional isolation support. Further analysis on the deformation mechanism of inclined rubber bearing and negative stiffness device was performed to obtain  the mechanical models of two  devices and the important parameters. The static tests of inclined rubber bearing and negative stiffness device were conducted, and the theoretical mechanical models of two types of devices were established. By analyzing the structural dynamic response under different levels of earthquakes, it is found that the HSLD isolation system can meet the design requirements of seismic performance at different levels, and the static displacement and seismic response of the entire structure can be effectively control.