隔震结构的随机地震反应与抗震可靠度评价

Stochastic Seismic Response and Aseismic Reliability Assessment of Base-Isolated Structures

将概率密度演化方法与物理随机地震动模型相结合,发展了隔震结构的随机地震反应与抗震可靠度评价方法.以江苏省某十层框架隔震结构为例,进行了8度罕遇地震下的随机地震反应与动力可靠度分析.算例说明随机地震反应分析可以给出明确的可靠度分析结果,而采用确定性地震动输入进行分析不能对结构的安全性进行合理的判断.建议方法可以客观、全面地评价一般多自由度系统的地震反应性态,是对面向工程对象进行精细化设计的一次有意义地尝试.

The paper presents a new scheme for stochastic seismic response and aseismic reliability assessment of base-isolated structures, which integrates the probability density evolution method with the physical stochastic ground motion model. A 10-story frame base-isolated structure subjected to rare earthquake of intensity 8 is investigated for an illustrative purpose. Stochastic seismic response and dynamic reliability analysis are carried out. The numerical results reveal that stochastic seismic response analysis can provide the reasonable reliability assessment while a few selected deterministic ground motions as usually employed in practice fail. It is noted that the proposed scheme can assess the seismic response performance of general multi-degree-of-freedom systems in the right perspective, which is avaluable tentative study on the engineering object-oriented precise aeslgn.