近断层速度脉冲型地震动对隔震结构设计影响初探  

The Design of Seismic Isolation Structure Subjected to Velocity Pulse Ground Motion Near Fault

作　　者：宋廷苏 阿拉塔 管庆松 牛喜伟 王艳茹[3] SONG Tingsu;A Lata;GUAN Qingsong;NIU Xiwei;WANG Yanru(Earthquake Engineering Research Institute Of Yunnan Province,Kunming 650041,China;Oujiang College,Wenzhou University,Wenzhou 325035,China;Shenzhen Academy of Disaster Prevention and Reduction,Shenzhen 518003,China)

机构地区：[1]云南省地震工程研究院,昆明650041 [2]深圳防灾减灾技术研究院,广东深圳518003 [3]温州大学瓯江学院,浙江温州325035

出　　处：《建筑钢结构进展》2018年第4期1-11,共11页Progress in Steel Building Structures

基　　金：国家自然科学基金(51508419);国家科技支撑计划(2012BAJ07B02);云南省地震局青年基金(201207);云南省社会发展科技计划-社会事业发展专项基金(2008CA007)

摘　　要：以云南澄江已建高层钢筋混凝土框架隔震结构为研究对象,该建筑距断层8km。考虑3种工况地震动输入进行隔震计算:未考虑速度脉冲的原设计地震动时程、含有速度脉冲的地震动时程和提取速度脉冲后的地震动时程。经对比分析得到如下结论:(1)与原设计时程和提取速度脉冲后时程相比,采用含速度脉冲时程计算的减震系数更大,即减震效果更差,与原设计相比,减震效果降低15.7%,与提取速度脉冲后的时程相比,减震效果降低7.1%;(2)罕遇地震下,采用含速度脉冲时程计算的隔震支座的最大水平位移更大,是原设计的1.43倍,是采用提取速度脉冲后的时程计算结果的1.68倍,原设计支座位移超限;(3)罕遇地震下,隔震支座最大拉压应力也明显增大,与原设计和提取速度脉冲后时程相比,拉、压应力均分别增大10%和200%,但仍满足规范要求;(4)针对建筑结构隔震设计,使用规范的地震动选取方法,有助于减小计算结果的离散性。A high-rise reinforced concrete frame building with seismic isolators is selected for this study.It is built in Chengjiang,Yunnan.The distance to the fault is 8 km.Three different cases of seismic ground motion are considered for the seismic isolation calculation of the building.The first case is the original design ground motion time history without considering the velocity pulse,the second case is a ground motion time history including velocity pulse,and the third case is a ground motion time history that velocity pulse is extracted.Based on analysis results,we can find that：（1）Compared with Case 1 and Case3,seismic isolation coefficient of Case 2 is larger.This means the seismic isolation effect is worse.Compared with case 1 and case 3,the effect is reduced by 15.7%and 7.1%respectively.（2）Compared with Case 1 and Case 3,the maximum horizontal displacement of isolators in Case 2 subjected to rare earthquake is larger,which is 1.43 times of Case 1 and 1.68 times of Case3.The isolator displacement exceeds the allowable value limit.（3）The maximum compressive and tensile stress of isolators in Case 2 subjected to rare earthquake is larger,which is 1.1 times of Case 1 and 3 times of Case 3.However,the maximum compressive and tensile stress of isolators for all three cases still meet the code requirement.（4）For the design of seismic isolated structures,the standard selection method of ground motion according to the code for seismic design of buildings canhelp to reduce the dispersion of calculation results.

关 键 词：速度脉冲 地震动 隔震设计 隔震支座最大位移 减震系数 

分 类 号：TU352.1[建筑科学—结构工程]