摘要
近年来板柱结构地下车库坍塌事故多发,而历史上梁板结构似乎少有发生,引发业界热议。本文旨在比较板柱结构和梁板结构超载至破坏的覆土厚度以及识别最先出现的破坏形式。首先,基于规范中各种破坏形式的承载力设计值计算方法,统计计算对应的安全系数,确定相应的极限承载力计算方法。这些破坏形式包括板柱结构的弯曲破坏、冲切破坏和直剪破坏,以及梁板结构的弯曲破坏、斜剪破坏和直剪破坏。随后分别设计板柱和梁板结构地下车库,考虑5种覆土厚度(1~3m)以及板柱结构2种节点形式(设置“托板”和“托板+柱帽”),增加覆土厚度致结构超载破坏。计算结果显示,设置托板的板柱结构的超载覆土厚度小于设置“托板+柱帽”的板柱结构和梁板结构,分别低约13%和15%,后两者的安全储备相差不大。对于板柱结构,超载下最先出现直剪破坏形式。
A couple of underground garages collapsed recently which were constructed using flat plate structures.Historically,few of the underground garages collapsed when using beam-slab structures.This attracts the attention of academic community.The present paper aims to compare the thicknesses of the covering soil for the flat plate structures and beam-slab structures under overloads,as well as to identify the first occurring of the failure mode.First,the methods to calculate the ultimate bearing capacities were investigated for the flat plate structures with the bending failure,punching failure and direct shear failure,as well as the beam-slab structures with the bending failure,oblique shear failure and direct shear failure.This was achieved by investigating safety factors corresponding to different failure modes.Afterwards,case studies were conducted on the basis of a designed flat plate structure and a designed beam-slab structure.Results found that,in case of overloads,the thickness of the covering soil of the flat plate structures using drop panel is about 13%and 15%smaller than those of the flat plate structures using“drop panel and capital”and the beam-slab structures,respectively.For the flat plate structures under overloads,the direct shear failure occurred usually first.
作者
陈子涵
徐哲
林峰
CHEN Zihan;XU Zhe;LIN Feng(Department of Building Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期732-738,共7页
Building Structure
基金
住房和城乡建设部课题(2020-K-132)
关键词
板柱结构
梁板结构
弯曲破坏
直剪破坏
冲切破坏
斜剪破坏
安全系数
flat plate structure
beam-slab structure
bending failure
direct shear failure
punching failure
oblique shear failure
safety factor
作者简介
第一作者:陈子涵,硕士研究生,Email:2132412@tongji.edu.cn;通信作者:林峰,博士,教授,博士生导师,Email:lin_feng@tongji.edu.cn。
