传统框架及楼板局部设缝框架柱端弯矩增大系数分析  

The CMAF Parameter Analysis for the Traditional Frame and the Frame with Local Gaps in Slabs

作　　者：张敏[1] 朱宏锋[1] 

机构地区：[1]广西科技大学土木建筑工程学院,柳州545006

出　　处：《结构工程师》2015年第1期21-27,共7页Structural Engineers

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：柱端弯矩增大系数是实现结构"强柱弱梁"的关键措施之一。分析了传统框架的柱端弯矩增大系数,表明现浇楼板对框架梁端抗弯承载力的贡献不可忽略,抗震规范给出的柱端弯矩增大系数难以实现梁铰屈服机制,柱端出现塑性铰难以避免,由此对框架梁侧楼板局部设缝,以消除楼板对框架梁端抗弯承载力的贡献,从而分析该楼板局部设缝框架的柱端弯矩增大系数,表明现行抗震规范给出的柱端弯矩增大系数对于楼板局部设缝的框架可以实现"强柱弱梁"屈服机制。The parameter ＂CMAF＂is one of the key measures to ensure the strong-column-weak-beam mechanism in frame structures.In this article,the traditional frame was analyzed to study the CMAF.It shows that the contribution of cast-in-place slab to the bearing capacity of the frame beam ends cannot be ignored.The CMAF parameter specified in the code for seismic design of buildings is difficult to help realize the beam-hinge yielding mechanism and it is easy to form the plastic hinges at the column end.The frame with local gaps in slabs was proposed to eliminate the slab contribution to the beam end moment bearing capacity.Frame structures with local gaps in slabs was analyzed to investigate the CMAF parameter,which indicates that the CMAF specified in the code help the frame with local gaps in slabs achieve the strong-column-weak-beam mechanism.

关 键 词：柱端弯矩增大系数 框架 设缝 强柱弱梁 屈服机制 塑性铰 

分 类 号：TU375.4[建筑科学—结构工程]