设置阻尼负刚度系统的高层隔震结构地震响应分析

基于预压弹簧的变形受力特点设计了一种附带阻尼的负刚度系统,该系统通过预压弹簧的斜向变形出力可实现负刚度性能,并采用黏滞阻尼器提供阻尼性能。根据上述思想设计组装了负刚度模型装置并进行静力试验研究,基于试验结果提出了考虑弹簧刚度、弹簧长度、弹簧预压缩量的负刚度系统的力学模型,并进一步建立了负刚度隔震系统的动力分析模型,提出了负刚度装置的最优参数选取方法,指出了最优负刚度配比的选取由隔震支座的阻尼比决定。将所提出的负刚度系统应用于某高层隔震结构中并进行了动力分析,结果表明,附加负刚度系统不仅能够减小高层建筑在地震作用下上部结构的加速度响应、层间变形,而且可有效控制隔震层的位移响应,实现了在罕遇地震作用下同时降低上部结构的加速度响应和隔震层位移响应的目标。

Seismic response of high-rise isolated building based on negative stiffness device with damping

A negative stiffness device with damping is designed based on deformation characteristics of preload spring. The negative stiffness effect is achieved through prepressing spring which provides load in the same direction with the deformation.The viscous damper is used to provide damping performance. According to the thought above, a set of model devices were assembled to carry out static test research. Based on the test results, a mechanical model of the new negative stiffness device was proposed. The mechanical properties of the negative stiffness device depended on spring stiffness, spring length and spring compression. The dynamic analysis model of negative stiffness isolation system was established, and the optimum parameter selection method of negative stiffness device was put forward. The selection of negative stiffness parameters depended on the damping ratio of isolation bearing. The negative stiffness device was used in a high-rise isolated structure and the dynamic analysis was accomplished. The results show that the device can not only decrease the acceleration response of the upper structure and inter-story drift, but also limit the displacement response of the isolated story effectively. The acceleration response and displacement response can be both controlled subjected to rare earthquake.