建筑板柱结构冲切破坏试验及节点承载力分析  

Punching shear failure test and joint bearing capacity analysis of building slab column structure

作　　者：邸振勇 杨新辉[2] 林霄 DI Zhen-yong;YANG Xin-hui;LIN Xiao(Audit Department,Southwest University,Chongqing 400715,China;Foundation Research Institute,Chinese Academy of Building Sciences,Beijing 100027,China;College of Engineering and Technology,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学审计处,重庆400715 [2]中国建筑科学研究院地基基础研究所,北京100027 [3]西南大学工程技术学院,重庆400715

出　　处：《吉林大学学报（工学版）》2023年第10期2879-2885,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：中国建筑科学研究院科研项目(20151602330730037)。

摘　　要：为保证建筑板柱结构的使用安全,以钢筋、水泥等为原料制作建筑板柱结构试件板,并实施冲切破坏试验,通过荷载-挠度曲线分析试件板各节点的冲切破坏过程及位移情况,根据节点承载力计算公式分别求解不同板厚、混凝土强度、纵向配筋率、冲垮比下节点承载力,并分析各因素变化对节点承载力的影响。试验结果表明:当试件板纵向荷载增加至最大承载力时,发生瞬时脆性破坏,各位移测点均发生翘曲,配筋率低的试件翘曲严重;试件板厚相同时,空心率越小,抗冲切承载力越大;大幅增大试件板厚度、钢筋配筋率、混凝土强度、降低冲垮比可提高试件板的抗冲切承载力,当配筋率从0.6%提升至1.4%时,节点抗冲切承载力最高可增大29.2%,当冲垮比为7、配筋率为0.6%时,增大混凝土强度,节点冲切承载力升幅较小。本文研究分析可在一定程度上为提升建筑板柱结构的承载力提供借鉴。In order to ensure the safety of the building slab-column structure,the slab-column structure specimen plate was made with steel bars,cement,etc.as raw materials,and the punching failure test was carried out.According to the calculation formula of the joint bearing capacity,the joint bearing capacity under different plate thicknesses,concrete strength,longitudinal reinforcement ratio,and crush ratio was calculated,and the influence of each factor change on the joint bearing capacity was analyzed.The experimental results show that when the longitudinal load of the specimen plate increases to the maximum bearing capacity,instantaneous brittle failure occurs,and warpage occurs at all displacement measuring points.The smaller the value,the greater the punching shear bearing capacity;greatly increasing the thickness of the specimen plate,the reinforcement ratio of reinforcement,the concrete strength,and reducing the punching collapse ratio can improve the punching shear bearing capacity of the specimen plate.When the reinforcement ratio increases from 0.6%to 1.4%,the maximum punching shear bearing capacity of the node can be increased by 29.2%.When the punching ratio is 7 and the reinforcement ratio is 0.6%,the increase of the concrete strength is small,and the increase in the punching shear bearing capacity of the node is small.To a certain extent,the bearing capacity of the building slab-column structure is improved.

关 键 词：建筑板柱结构 冲切破坏 承载力 冲垮比 纵向配筋率 混凝土强度 

分 类 号：TU375.2[建筑科学—结构工程]