智能隔震:基于能量响应和可靠度的前景分析

介绍了智能隔震结构能量响应和动力可靠度分析的主要方法和数值规律。以多遇地震的情形为例,显示了线弹性智能隔震体系的瞬时能量传递的解析规律;以罕遇地震的情形为例,列举了滞变智能隔震结构的动力可靠度分析方法。在罕遇地震下,用退化Bouc-Wen模型描述上部结构的恢复力,用非退化Bouc-Wen模型描述隔震层的恢复力。采用虚拟激励法计算结构的随机响应,根据我国抗震规范中“大震不倒”的设防目标,采用各层最大层间位移峰值响应和累积滞变耗能构造双参数的随机疲劳累积损伤指数,作为功能状态指标。以作者承担的一项实际隔震工程作为数值算例,对比了被动隔震、智能隔震与非隔震体系的能量响应和条件失效概率,显示了智能隔震体系的减震优势。

SMART ISOLATION: FUTURE PROSPECT BASED ON ENERGY RESPONSE AND DYNAMIC RELIABILITY

This paper presents the main method and some numerical results for the analysis of energy response and dynamic reliability of smart isolated structures. Using the structures under minor earthquakes as examples, a momentary energy transferring relation in smart isolated structures is derived using analytical method, and the method for analysis of dynamic reliability of smart isolated structures is listed under major earthquakes. In the case of major earthquakes, Bouc-Wen hysteretic model is adopted to represent the isolator and degrading Bouc-Wen model is used for the superstructure. The pseudo excitation method (PEM) is employed to calculate the random response of the structures. Double damage parameters of maximum story drift and hysteretic energy are adopted as limit state indexes according to the requirement of “no collapse under major earthquake” specified by Aseismic Design Code of China. Using a real isolated structure, designed by the authors, as a numerical example, the energy response and conditional failure probability of passive and smart isolated structures were compared with those of the fixed base structures, the advantage of vibration mitigation of smart isolation was demonstrated.