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考虑不均匀沉降的大跨网架结构地震反应分析
引用本文:颜学渊,王秀珠.考虑不均匀沉降的大跨网架结构地震反应分析[J].福州大学学报(自然科学版),2017,45(4):486-492.
作者姓名:颜学渊  王秀珠
作者单位:福州大学土木工程学院,福州大学土木工程学院
基金项目:国家自然科学资助(51578160)、福建省教育厅科技项目资助(JA15050)和福建省高校杰出青年科研人才计划项目资助(810104)
摘    要:针对不均匀沉降对大跨网架结构地震反应的不利影响,提出在柱顶设置不同隔震支座以减小不均匀沉降下结构的地震反应.建立大跨网架结构数值模型,进行模态分析,对比其动力特性.耦合不均匀沉降与地震作用,数值分析得到未发生不均匀沉降和发生不均匀沉降的三种结构在水平地震和竖向地震作用下的动力反应.结果表明,不均匀沉降导致结构发生内力重分布,使不同类型的杆件有大小不同的附加应力;不均匀沉降增大了网架结构的地震反应,也降低了隔震效果;三维隔震支座的竖向刚度较小,能够适应不均匀沉降带来的竖向变形,且对竖向地震作用的隔震效果显著,在发生不均匀沉降时仍具有一定隔震效果,而水平隔震支座则没有.

关 键 词:不均匀沉降  大跨网架结构  水平地震作用  竖向地震作用  三维隔震  地震反应分析
收稿时间:2017/3/9 0:00:00
修稿时间:2017/5/8 0:00:00

Seismic response analysis of long-span grid structure considering uneven settlement
YAN Xueyuan and WANG Xiuzhu.Seismic response analysis of long-span grid structure considering uneven settlement[J].Journal of Fuzhou University(Natural Science Edition),2017,45(4):486-492.
Authors:YAN Xueyuan and WANG Xiuzhu
Affiliation:College of Civil Engineering,Fuzhou University,Fuzhou,College of Civil Engineering,Fuzhou University,Fuzhou
Abstract:A method of installing different isolation bearings on the top of the column to reduce the structural seismic response under uneven settlement, according to the negative influence of uneven settlement on the seismic response of long-span grid structure. Horizontal isolation and three-dimensional isolation parameters were determined reasonably, then numerical model of long-span grid structures with a size of 120m × 60m were established. Modal analyses of the aseismic grid structure, horizontal isolated grid structure and three-dimensional isolated grid structure were performed, their dynamic characteristics were analyzed and compared. Coupling uneven settlement and earthquake action, numerical analyses were performed, then horizontal and vertical seismic responses of the three structures were obtained. Analysis results indicate that uneven settlement causes inner force redistribution, makes different bar have different additional stress. Uneven settlement amplifies the seismic reactions of the structures, and reduces the isolation effects. Three-dimensional isolation bearing has small vertical stiffness, it can adapt to the vertical displacement that uneven settlement brings about. It has vertical isolation effect for the vertical ground motions, even there is uneven settlement, while horizontal isolation bearing do not have.
Keywords:uneven settlement  long-span grid structure  horizontal earthquake action  vertical earthquake action  three-dimensional isolation  seismic response analysis
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