汶川地震远场地震动特征及其对长周期结构影响的分析  

Characteristics of Far-Field Ground Motion of Wenchuan Earthquake and the Effect on Long-Periodic Structures

作　　者：杨伟林[1] 朱升初[1] 洪海春[1] 陶小三[1] 唐忠良[1] 

机构地区：[1]江苏省地震工程研究院,南京210014

出　　处：《防灾减灾工程学报》2009年第4期473-478,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省自然科学基金项目(BK2004161);江苏省交通科学研究计划项目(04Y025)资助

摘　　要：汶川8.0级大地震中,中国数字强震动台网获得了大量的数字强震动记录,这些记录特别是远场记录具有丰富的长周期地震动分量。本文根据东南强震动中心获取的区域数字强震动记录,分析汶川8.0级地震的远场地震动特征,研究了基岩场地及深厚软弱场地的长周期地震动及其差异;根据长周期结构的特点,选取建于深厚软弱场地上的江苏A050强震台的超长地震记录进行结构地震反应分析,研究汶川8.0级地震对远场长周期结构的影响,并结合实际震害特点,提出了长周期结构抗震及地震安全对策中一些值得注意和思考的问题。After the Wenchuan M 8.0 extraordinary earthquake occurred in Sichuan province on May 12, lots of digital strong motion records are gained by the China Digital Strong Motion Seismograph Network. The records, especially far-field records, provide ample ground motion component of long period structures. According to the digital strong motion records of several South-East provinces, the characteristics of far-field ground motion of the Wenchuan M 8.0 extraordinary earthquake are analyzed, and the long-period ground motion characteristics of deep and soft soil sites and rock sites and their differences are researched. Based on the characteristics of the long-period structures, the seismic response analysis of structure is carried out using the super-long seismic records of the A050 strong ground motion station, which was built on the site with deep and soft soil layers. The effects of far-field ground motion on long-periodic structures during Wenehuan M 8.0 extraordinary earthquake are researched, and some noticeable and thoughtful issues in earthquake resistance of long-period structures and earthquake safety countermeasures are put forward according to the actual characteristics of earthquake disasters.

关 键 词：汶川 8.0级地震 远场地震动特征 长周期结构 地震反应分析 

分 类 号：P315.9[天文地球—地震学]