摘要
针对砌体填充墙框架结构在地震作用的下的受力特点,分析了填充墙RC框架结构产生震害的主要原因。建立填充墙简化分析的等效斜撑模型,利用SAP2000有限元分析软件进行填充墙框架结构教学楼的地震反应推覆分析。侧向加载模式分别采用振型荷载模式和均布荷载模式,主要考察填充墙对典型RC框架结构教学楼在大震作用下抗震性能的影响。分析结果表明:在大震作用下,结构达到能力谱方法确定的性能点时,按现行规范设计的框架结构教学楼的层间弹塑性变形能够满足规范要求。但填充墙的影响改变了框架结构塑性铰的分布和发展水平,尤其半高填充墙对框架柱的约束使得底层框柱可能发生剪切破坏,使结构在大震下倒塌的危险性增大。研究结果可为此类结构在大震作用下的抗震性能评价及抗震加固提供参考。
According to the seismic resistance of an infilled frame under strong earthquakes, the main reasons for earthquake damadge to infilled frame structures are analyzed. Infilled wall is simplified into equivalent inclined strut model. SAP2000 FEM software is adopted to analyze typical RC frame by using two levels load distribution modes of the uniform distribution and oscillation mode. The computed results show that the displacement between floors of school buildings designed in new standard can meet the challenge. Infilled wall plays a part in energy-dissipating, on the other hand,it has changed the development and distribution of plastic hinge. Especially shear breakdown may appear in bottom column in the force influence of half infilled wall, and the structure is more danger in high-level earthquake. The research offers reference on the seismic performance assessment and strengthening of this type of buildings in high- level earthquake.
出处
《工程抗震与加固改造》
北大核心
2010年第2期31-36,67,共7页
Earthquake Resistant Engineering and Retrofitting
基金
教育部新世纪优秀人才支持计划项目(NCET-06-0571)
福建省自然科学基金项目(E0810021)
关键词
框架结构
填充墙
推覆分析
等效斜撑模型
frame structure
infilled wall
pushover analysis
equivalent inclined strut model
