自复位支撑-摇摆框架结构体系及其基于位移抗震设计方法  

Self-centering braced rocking frame systems and displacement-based seismic design method

作　　者：周颖[1] 肖意 顾安琪 ZHOU Ying;XIAO Yi;GU Anqi(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghui 200092,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室

出　　处：《建筑结构学报》2019年第10期17-26,共10页Journal of Building Structures

基　　金：科技部国家重点研发计划项目(2016YFC0701101)

摘　　要：本文提出一种可恢复功能结构体系——自复位支撑-摇摆框架结构体系,旨在同时实现较大刚度、自复位能力以及构件间的变形协调。针对可恢复功能结构体系防震能力强的特点,已建立了可恢复功能结构体系"小震及中震不坏,大震可更换、可修复,巨震不倒塌"的抗震设防四水准目标。文中结合可恢复功能结构体系四水准性能指标,采用基于位移的抗震设计方法,进行了自复位支撑-摇摆框架结构设计。以一幢四层结构为例,给出了四水准抗震设防目标下的基于位移设计方法算例,并建立了ABAQUS有限元数值模型,进行了弹塑性时程分析。分析结果表明,按文中方法设计的自复位支撑-摇摆框架体系可满足可恢复功能结构体系抗震设防目标,达到各性能指标要求。This paper proposes a resilient structure named self-centering braced rocking frame( SBRF) system,which is designed to achieve large stiffness,large self-centering capacity while maintaining deformation compatibility. Given the excellent seismic performances of resilient structures,a specific four-level seismic fortification objective system for resilient structures has been established,which can be summarized as "no damage under minor and moderate earthquake,replaceable or repairable under major earthquake,and no collapse under mega earthquake". This paper further develops design seismic performance indexes of SBRF systems under the four seismic levels and applies a displacement-based seismic design methodology to design the new system. A four-story structure design example of SBRF systems using the displacement-based method to achieve the four-level seismic fortification objectives is presented. A numerical model is established in ABAQUS and elasto-plastic time history analyses are executed. It is shown that the SBRF system designed by the displacement-based seismic design method satisfies the enhanced seismic fortification objectives and performance objectives for resilient structures.

关 键 词：自复位支撑 摇摆框架 四水准抗震设防 基于位移抗震设计 弹塑性时程分析 

分 类 号：TU352.11[建筑科学—结构工程] TU311.41