高烈度区L型平面不规则多层框架结构隔震设计与研究

Base Isolation Design and Research for the L-shaped Plane Irregular of Multilayer Frame Structure in High Earthquake Intensity Regions

针对高烈度区L型平面不规则多层框架结构采用基础隔震技术进行了研究.采用ETABS软件对我国高烈度区L型平面不规则多层框架结构建立了精细化有限元模型,提出该结构基础隔震设计目标.对L型平面不规则多层框架结构进行了叠层橡胶支座的布置与选型.基于时程分析法,研究基础隔震效果.结果表明:L型平面不规则多层框架采用基础隔震技术能有效地降低上部结构的地震反应,大大提高结构的安全性;单向或者双向地震作用对该L型平面不规则多层框架隔震结构水平向减震系数的影响基本一致;双向地震作用与单向地震作用对比下,隔震层位移、叠层橡胶支座极大面压和极小面压均有所增加,但均满足规范要求.同时,为后续类似工程提供了依据和参考.

Research on base isolation design for the L-shaped plane irregular of multilayer frame structure in high earthquake intensity regions is presented.The fine finite element model of the L-shaped plane irregular of multilayer frame structure in high earthquake intensity regions is established by the software of ETABS,and the objective of base isolation design for the L-shaped plane irregular of multilayer frame structure is proposed.Isolators are optimized and arranged for the L-shaped plane irregular of multilayer frame structure herein.Timehistory analysis of the isolated L-shaped plane irregular of multilayer frame structure is carried out and control effectiveness of base isolation of the L-shaped plane irregular of multilayer frame structure is evaluated.Results show that base isolation technology can significantly reduce the seismic response of the L-shaped plane iregular of mulilayer frame structure and increase the seismic safety reservation of the L-shaped plane irregular of multilayer frame structure.The influence of unidirectional or bidirectional seismic on the horizontal damping coefficient of the L-shaped plane irregular of multilayer frame isolated structure is basically unanimously.The displacement of isolation layer and the maximum and minimum surface pressure of laminated rubber bearing are increased under the comparison of bidirectional seismic and unidirectional seismic,but all targets can meet the requirements of the specification.Meanwhile,it provides the basis and reference for the following similar projects.