摘要
实际记录到的真实地震动在工程结构的抗震研究、分析和设计中往往作为一种施加到结构上使结构振动 ,直至破坏的地震荷载 .如何合理选择真实的地震动记录作为研究结构地震反应的输入 ,一直是国内外抗震研究和设计中引人关注的重要问题 .本文首先提出了最不利设计地震动的概念 ;然后在收集到的国内外 5 0 0 0余条被认为有重要意义的地震动记录基础上 ,利用综合估计地震动潜在破坏势的方法 ,对 4种场地类型分别给出了长周期、短周期和中周期结构的国内外最不利设计地震动 ;最后通过几类不同结构的地震反应分析 ,初步验证了本文所确定的最不利设计地震动的可靠性和合理性 .
How to select the adequate real strong earthquake ground motion for seismic analysis and design of structures is an essential problem in earthquake engineering research and practice. In the paper the concept of the severest design ground motion is proposed and a method is developed for comparing the severity of the recorded strong ground motions. By using this method the severest earthquake ground motions are selected out as seismic inputs to the structures to be designed from a database that consists of more than five thousand significant strong ground motion records collected over the world. The selected severest ground motions are very likely to be able to drive the structures to their critical response and thereby result in the highest damage potential. It is noted that for different structures with different predominant natural periods and at different sites where structures are located the severest design ground motions are usually different. Finally, two examples are illustrated to demonstrate the rationality of the concept and the reliability of the selected design motion.
出处
《地震学报》
CSCD
北大核心
2003年第3期250-261,共12页
Acta Seismologica Sinica
基金
国家自然科学基金重大项目 (5 9895 4 10 )
地震科学联合基金 (95 0 7 4 4 4 )
