低延性钢筋混凝土框架结构抗震性能分析与评估  

Seismic performance analysis and evaluation for low-ductile RC frame structures

作　　者：张沛洲[1] 欧进萍[1,2] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2013年第12期11-18,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51261120376);"973"国家重点基础研究发展计划项目(2007CB714202)

摘　　要：对抗震设防水平不高、抗震构造措施设置不足且已经服役多年的低延性钢筋混凝土框架结构抗震性能的主要影响因素进行总结,在此基础上从构件层面逐一分析各影响因素的敏感性,采用有限元分析软件OpenSees建模分析、评估两类延性不同但具有相同尺寸及配筋率的结构的抗震性能,分别从结构与构件层面对比不同延性结构失效模式的差异性。分析结果表明,低延性结构抗震能力较新建结构差,但均满足现行抗震规范"大震不倒"的设计要求;当增强地震作用后,低延性结构的抗震性能远弱于新建结构,具体表现为延性低,耗能差,抗倒塌能力弱,易发生脆性破坏,结构低延性特征明显。The factors that have influences on the seismic performance of low-ductile structures with poor seismic fortification level, insufficient seismic fortification measures and long service ages were summarized. The sensitivity analysis of these factors was conducted at component level. Two RC frame structures with same dimension and reinforcement ratio but different ductility were modeled and analyzed using OpenSees, and the differences of their seismic performance and failure modes were evaluated. The results show that seismic force-resisting capacities of long low-ductile structures are weaker than those of newly-built ones, but all can satisfy the current seismic code under severe earthquakes. When structures suffer severer earthquake, seismic capabilities of these structures are much weaker than those of newly-built ones, showing low ductility, poor energy dissipation capacities, weak collapse- resistance capacities, and brittle failure modes.

关 键 词：钢筋混凝土框架结构 低延性 有限元分析 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU311.41