摘要
为了研究现浇楼板及其钢筋对RC框架结构抗震性能的影响,分别按考虑和忽略现浇楼板及其钢筋对梁抗弯能力的增强作用,建立带有楼板及其钢筋的框架模型和空框架模型,采用四种不同的侧向加载方式对其进行pushover分析,对比框架顶点位移-基底剪力曲线、塑性铰出铰顺序、屈服机制、层间位移等抗震性能指标。分析结果表明:现浇楼板及其钢筋将提高框架梁的抗弯能力,从而改变罕遇地震作用下结构的破坏模式。建议抗震设计中考虑现浇楼板的影响,尤其是罕遇地震作用下宜考虑板内钢筋约束效应。
In order to study the influence of casting slab and reinforcement in the slab on seismic performance of RC frame structures, three models of frame structures are provided in which the beam strength is calculated with or without consideration of the slab in compression and slab reinforcement in tension. And then a pushover analysis with four common load patterns of each model is carried out. Such seismic indicators are analyzed and compared as the relationship curve of base shear force and roof lateral displacement, yielding mechanism, plastic hinges distribution, and storey displacement. The analysis results show that casting slab and reinforcement in the slab can improve bending ability to the frame beam so that failure mode for a structure may he changed in the earthquake of scarcely occurred intensity. Finally some suggestions are put forward such as considering the influence of casting slab in seismic design, especially restriction effect of reinforcement in the slab in the earthquake of scarcely occurred intensity.
出处
《工程抗震与加固改造》
北大核心
2015年第5期35-40,44,共7页
Earthquake Resistant Engineering and Retrofitting
基金
北京市自然科学基金资助项目(8152008)
关键词
框架结构
PUSHOVER分析
破坏模式
现浇楼板
板内钢筋
frame structure
pushover analysis
failure mode
casting slab on RC frame structure
reinforcement in the slab
