现浇楼板对RC框架结构柱端弯矩放大系数的影响  

Influence of cast-in-place floor on the amplification coefficient of column end moment in reinforced concrete frame structure

作　　者：胡凯婷 易伟建[1,2] 张望喜[1,2] HU Kaiting;YI Weijian;ZHANG Wangxi(College of Civil Engineering, Hunan University, Changsha 410012, China;Hunan Provincial Key Lab on Diagnosis for Engineering Structures of Hunan University, Changsha 410012, China)

机构地区：[1]湖南大学土木工程学院,长沙410012 [2]湖南大学工程结构损伤诊断湖南省重点实验室,长沙410012

出　　处：《中国科技论文》2020年第6期641-651,共11页China Sciencepaper

基　　金：国家自然科学基金资助项目(51878260)。

摘　　要：针对混凝土框架结构梁柱节点塑性铰多形成在柱端导致框架结构层间侧移偏大,易增加倒塌风险的问题,通过3种不同的考虑楼板的建模方式进行动静力弹塑性分析。结果表明:柱弯矩增大系数为1.7时不会出现强柱弱梁破坏机制,轴压比为0.66时框架柱两端均出现塑性铰。该结构框架梁端有效翼缘不能取6倍板厚,整浇楼板模型形成的破坏机制更为不利。Plastic hinges of the beam-column joints of the concrete frame structure are mostly formed at the end of the column,which causes the lateral displacement of the frame structure to be large,increasing the risk of collapse.The dynamic and static elastoplastic analysis was carried out by three different modeling methods of considering the slab.The results show that the failure mechanism of strong columns and weak beams can not be found when the increasing coefficient of column moment is 1.7,and the plastic hinge appears at both ends of frame columns when the axial compression ratio is 0.66.The effective flange of the beam end of the frame can not be taken as 6 times of the slab thickness,and the failure mechanism of the cast-in-place slab model is more unfavorable.

关 键 词：钢筋混凝土框架结构 强柱弱梁 现浇楼板 不同柱弯矩增大系数 

分 类 号：TU375[建筑科学—结构工程]