型钢混凝土组合板柱节点冲切破坏机理研究  

Study on punching failure mechanism of steel reinforced concrete slab-column joints

作　　者：尚鋆 周理 黄勇 SHANG Jun;ZHOU Li;HUANG Yong(College of Civil Engineering,Guizhou University,Guiyang 550003,China;College of Architecture and Urban Planning,Guizhou University,Guiyang 550003,China;Guizhou Zhongjian Spatial Structure Technology Co.,Ltd.,Guiyang 550018,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550003 [2]贵州大学建筑与城市规划学院,贵州贵阳550003 [3]贵州中建空间工程科技有限公司,贵州贵阳550018

出　　处：《四川建筑科学研究》2020年第2期32-42,共11页Sichuan Building Science

基　　金：国家自然科学基金(51368009);贵州大学引进人才科研基金资助项目(2019(08)号)。

摘　　要：为研究型钢混凝土组合板柱节点的抗冲切性能,以节点布钢形式、板纵筋配筋率、混凝土强度等级、板厚及型钢配钢率为研究参数,共设计了12个数值分析模型,采用有限元软件ABAQUS进行了计算,分析了各模型的竖向荷载板中心挠度曲线、极限承载力,并详细地探究了型钢混凝土组合板柱节点的冲切破坏机理。研究结果表明,在板柱节点中布置型钢可显著提升节点的抗冲切性能,并且随着型钢布钢数量、板纵筋配筋率、混凝土强度等级、混凝土板厚及型钢配钢率的增加,节点的抗冲切性能均会得到不同程度的提升。在型钢混凝土组合板柱节点受载破坏过程中,首先为板底混凝土受拉开裂,随后板纵筋及型钢下翼缘受拉屈服,最后为柱周边板顶混凝土被压酥,破坏具有明显的延性破坏特征。此外,对型钢混凝土组合板柱节点的冲切破坏机理研究显示,组合节点的冲切破坏面由柱对板形成的冲切面及型钢梁对板形成的冲切面两部分组成。In order to study the punching performance of steel reinforced concrete(SRC)slab-column joints,a total of 12 numerical models were designed.The research parameters were the steel distribution type,the ratio of plate longitudinal bars,the concrete strength grade,the plate thickness and the ratio of I-shaped steel.All models were calculated by using finite element software ABAQUS.The vertical load-deflection curve and ultimate bearing capacity of each model were analyzed in detail,as well as the punching failure mechanism of the SRC slab-column joints.The results show that the punching performance of the joints with shaped steel can be significantly improved.Further,the punching performance of the composite joints can be improved to different degrees with the increase of the quantity of shaped steel,ratio of plate longitudinal bars,concrete strength grade,plate thickness and ratio of I-shaped steel.In the loading process of SRC slab-column joints,first,the bottom concrete is cracked,then the longitudinal bars and lower flange of shaped steel are yielded,and finally,the top concrete around the column is crushed,which has obvious ductile failure characteristics.In addition,the research on the punching failure mechanism of the joints shows that the punching failure surface of composite joints consists of two parts which are the punching surface formed by column and the punching surface formed by steel beam.

关 键 词：型钢混凝土 板柱节点 抗冲切性能 破坏机理 数值模拟 

分 类 号：TU398[建筑科学—结构工程]