Seismic response of spring-damper-rolling systems with concave friction distribution
Seismic response of spring-damper-rolling systems with concave friction distribution
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DOI：
10.12989/eas.2016.11.1.025
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发表时间：
2016-07
影响因子：
1.5
通讯作者：
Biao Wei;Peng Wang;Xuhui He;Li-zhong Jiang
中科院分区：
文献类型：
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作者：
Biao Wei;Peng Wang;Xuhui He;Li-zhong Jiang
滚动摩擦系数分布不均匀可能导致结构隔震性能存在很大的不确定性。本文试图通过人为地使不均匀的摩擦力分布呈凹形来提高弹簧-阻尼-滚动隔震系统的隔震性能。地震时，当隔震器滚离原位置时，滚动摩擦系数逐渐增大。通过数值分析方法对不同地震动作用下的弹簧-阻尼-滚动隔震系统进行计算后，该系统得到了比随机不均匀摩擦力分布更规则的结果。结果表明，凹形摩擦分布不仅可以消散地震能量，而且可以改变结构的自然周期。与滚动摩擦系数的随机不均匀分布相比，这些功能提高了弹簧-阻尼-滚动隔震系统的隔震效率，并且即使实际地震与设计地震存在显着差异，也始终能达到相对可接受的隔震状态。
The uneven distribution of rolling friction coefficient may lead to great uncertainty in the structural seismic isolation performance. This paper attempts to improve the isolation performance of a spring-damper-rolling isolation system by artificially making the uneven friction distribution to be concave. The rolling friction coefficient gradually increases when the isolator rolls away from the original position during an earthquake. After the spring-damper-rolling isolation system under different ground motions was calculated by a numerical analysis method, the system obtained more regular results than that of random uneven friction distributions. Results shows that the concave friction distribution can not only dissipate the earthquake energy, but also change the structural natural period. These functions improve the seismic isolation efficiency of the spring-damper-rolling isolation system in comparison with the random uneven distribution of rolling friction coefficient, and always lead to a relatively acceptable isolation state even if the actual earthquake significantly differs from the design earthquake.