近场水平、竖向地震共同作用下地基-基础-RC框架结构抗震性能研究  

Seismic performance of soil-foundation-RC frame under near-fault horizontal and vertical earthquake

作　　者：王海东[1,2] 常广乐[1] 盛旺成 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学建筑安全与节能教育部重点试验室,湖南长沙410082

出　　处：《地震工程与工程振动》2017年第1期192-198,共7页Earthquake Engineering and Engineering Dynamics

基　　金：新世纪优秀人才支持计划(NCET-13-0190);湖南省自然科学基金(13JJA001);中央高校基本科研业务费~~

摘　　要：本文运用SAP2000对一10层钢筋混凝土框架结构在双向地震作用和单向地震下,考虑土-结构相互作用并计入重力二阶效应影响和不考虑二阶效应、采用刚性地基假定的情况分别进行动力时程分析,对比研究该结构抗震性能的变化规律。然后针对竖向地震作用展开进一步研究,探讨地震波的竖向和水平PGA比值对结构地震响应的影响规律。研究表明:(1)近场双向地震作用下,采用刚性地基假定,分析得到的结构地震响应比考虑土-结构相互作用时小,偏于不安全。(2)近场双向地震作用下地基-基础-RC框架结构的地震响应比单向地震作用时大,且随着场地土变软,不利影响增大,表明竖向地震作用不容忽视。(3)近场地震中,考虑土-结构相互作用的情况下,结构抗震性能在地震竖向和水平PGA比值为0.6左右时所受影响最小,比值为0.7左右时所受影响最大。In this paper, using the program SAP2000 to time-history analyzing a 10-story reinforced concrete frame structure considering soil-structure interaction together with the influence of gravity second-order effects, variable rule of the seismic performance of the RC frame structure was comparatively studied under bidirectional and unidirectional earthquake. Then, effect of ratio of the vertical and horizontal PGA on structural seismic response was further researched. The results have shown that ： （ 1 ） Under the near-field bidirectional earthquake, the ratios of structural seismic responses with rigid foundation assumption are smaller than those considering soil-structure in- teraction, which belongs unsafe. （2）Under the near-field bidirectional earthquake, the seismic responses of soil- foundation-RC frame structure are bigger than unidirectional earthquake action, and with the ground soil being soft, the adverse effects increases. This indicats that the vertical earthquake can not be ignored. （3）Under the near- field earthquake, the effect on the seismic performance of RC frame with soil-structure interaction is the minimum when the vertical and horizontal earthquake PGA ratio is about 0.6, however, the effect is the maximum when the ra- tio is around 0. 7.

关 键 词：近场地震 钢筋混凝土框架结构 竖向地震作用 土-结构相互作用 

分 类 号：TU375.4[建筑科学—结构工程] P315.92[天文地球—地震学]