摘要
在高烈度地区,通常采用减震技术减小主体结构的地震响应。针对本工程软弱土场地的特点,通过试算两种结构方案的减震效率进行比选,最终采用耗能型屈曲约束支撑作为本工程的减震构件,屈曲约束支撑性能目标设定为小震下保持弹性提供抗侧移刚度,大震下核心区屈曲提供耗能。屈曲约束支撑采用跃层交叉布置的形式,传力直接,减小了节点板数量。对该结构进行快速非线性时程分析,验证了小震下支撑处于弹性阶段,有效提供了抗侧移刚度。对该结构进行大震下弹塑性时程分析,结果表明该结构减震率达到当地政策要求,耗能构件与子结构达到预期的性能目标。针对受力较大的耗能子结构框架,配筋时采用四级钢加强框架的抗震性能。
In high seismic intensity areas,damper is usually used to reduce the seismic response of the main structure.According to the characteristics of the soft soil site of the project,the energy dissipation buckling restrained brace(BRB)is selected as the damping member after comparison.The performance objective of the BRB is to maintain the elasticity and provide the lateral stiffness under small earthquake,and to provide the energy dissipation under large earthquake.The BRB are arranged in the form of cross layer,which can transfer forces directly and reduce the number of gusset plates.The fast nonlinear time history analysis of the structure verifies that the brace is in the elastic stage under small earthquake.The elastoplastic time history analysis of the structure under large earthquake is carried out.The results show that the damping ratio of the structure meets the local policy requirements,and the energy dissipation components and substructures achieve the expected performance goals.For the substructure frame with large load,four grade steel is used to strengthen the seismic performance of the frame.
作者
张羿彬
ZHANG Yibin(Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China)
出处
《建筑结构》
CSCD
北大核心
2021年第S01期944-949,共6页
Building Structure
关键词
软弱土场地
减震
屈曲约束支撑
FNA
弹塑性时程
soft soil site
damping
buckling restrained brace
FNA
elastoplastic time history
作者简介
张羿彬,学士,工程师,一级注册结构工程师,Email:504954190@qq.com。
