钢-混凝土组合板的弹性整体剪切屈曲分析  

Elastic buckling of steel-concrete composite slabs subjected to pure shear load

作　　者：吴丽丽[1] 聂建国[2] 

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《东南大学学报（自然科学版）》2011年第3期622-629,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50808110);中国博士后科学基金资助项目(20080430042)

摘　　要：为了研究钢-混凝土组合板的弹性整体剪切屈曲性能,采用夹层板理论推导了组合板弹性屈曲方程,分析了界面剪切刚度的影响.通过在钢与混凝土之间设置假想的剪切薄层,模拟钢-混凝土组合板界面滑移效应,建立考虑滑移效应的组合板分析模型,推导出四边简支矩形组合板在均匀受剪状态下的弹性屈曲方程,并分析了界面剪切滑移刚度对屈曲荷载的影响.通过参数分析拟合了防止完全剪力连接四边简支组合板整体屈曲所需混凝土板最小厚度的计算公式.结果表明,剪切刚度较小时,屈曲荷载增长较快;剪切刚度较大时,屈曲荷载变化缓慢并逐渐趋于稳定,与完全剪力连接组合板的屈曲值接近.该结果与有限元计算结果吻合较好.In order to study the elastic stability of steel-concrete composite slabs,the elastic buckling equations for the composite slabs is deduced based on the theory of sandwich panels,and the influence of the interface shear stiffness is also analyzed.The analytical model of the steel-concrete composite slab is proposed by inserting a fictitious thin shear-layer and simulating the interface slip effects resulting from studs between the steel and concrete slabs.Therefore,a set of partial differential equations is derived for elastic buckling analysis of simply supported rectangular steel-concrete composite slab in pure shear.The influence of shear slip stiffness of the interface of steel and concrete on the critical buckling loads is analyzed.In addition,through parameter analysis,a regressed formula of the minimal thickness of concrete plate is suggested for preventing simply supported rectangular steel-concrete composite slabs with full shear connection from global shear buckling.It is shown that the shear buckling loads increase rapidly when the slip stiffness is relatively small,on the contrary,when the slip stiffness gets larger the buckling loads change slowly and gradually tend to become stable,approaching to the value of the composite slabs with full shear connection.The results from the model and method in this paper agree well with those given by the finite element method.

关 键 词：钢-混凝土组合板 整体 剪切屈曲 最小混凝土板厚度 

分 类 号：TU318.1[建筑科学—结构工程]