楼板局部设缝框架结构静力弹塑性分析  

Static Elasto-plastic Analysis of Reinforced Concrete Frame Structure with Local Slot in Floorslab

作　　者：张敏[1] 李冬梅[1] 

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《建筑科学》2015年第9期13-18,25,共7页Building Science

基　　金：国家自然科学基金资助项目(51368007);广西高校科学技术研究重点项目(2013ZD047);广西自然科学基金项目(2014GXNSFAA118327)

摘　　要：框架结构实现"梁铰屈服"机制是保证大震不倒的措施之一。本文在以往研究的基础上,提出楼板局部设缝框架结构,即在框架梁端塑性铰范围的侧向楼板内设置贯穿板厚的通缝,以消除现浇楼板及其纵筋对梁端抗弯承载力的贡献,实现梁铰屈服机制。文章针对7度和8度设防烈度的设缝框架和传统框架分别进行静力弹塑性分析,研究结构P-Δ变形曲线、塑性铰分布以及结构的屈服机制,并分别对楼板局部设缝框架和传统框架进行抗震能力评估。结果表明,楼板局部设缝能改善框架结构的屈服机制,满足"强柱弱梁"抗震要求,提高结构抗震性能。Frame structure achieving beam-hinge yield mechanism is one of measures of structure no collapsing during rare earthquake. Based on the existing researches,frame structure with local slot in floorslab is presented in this paper——the straight slots penetrating slab thickness in floorslab may be designed along plastic hinge length of frame beam ends to eliminate the contribution of in-situ floorslab and its longitudinal steels on the flexural capacity of the beam ends,and to achieve the beam-hinge yield mechanism. The traditional frame and the frame with local slot in floorslab are analyzed by push-over method under intensity 7 and 8. P-Δ deformation curve,distributions of the plastic hinge and yield mechanism of the structure are studied. Besides,the seismic capacities of traditional frame and the frame with local slob in floorslab are evaluated. The results show that local slot in floorslab can improve the yield mechanism of the frame structure,satisfy the seismic requirements of ＂strong column and weak beam＂,and raise the structure seismic performance.

关 键 词：框架 设缝 静力弹塑性分析 塑性铰 屈服机制 

分 类 号：TU352.11[建筑科学—结构工程]