混凝土单向板的受拉薄膜效应计算  

Calculation of tensile membrane effect of one-way concrete slabs

作　　者：张大山[1] 董毓利[1] 吴亚平 

机构地区：[1]华侨大学土木工程学院,福建泉州362021 [2]机械工业第三设计研究院建筑一所,重庆400039

出　　处：《吉林大学学报（工学版）》2013年第5期1253-1257,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51178143);高等学校博士学科点专项科研基金项目(20102302110043)

摘　　要：为有效地计算混凝土单向板在大变形下的极限承载力,基于屈服线理论提出了考虑受拉薄膜效应的板块平衡法。该方法在建立板块平衡方程时计入了大变形下塑性铰线截面处逐渐显著的钢筋合力的竖向分量,即受拉薄膜效应。进行了3种不同边界条件的6块钢筋混凝土单向板的大变形静力加载试验,获得了荷载-挠度曲线、极限承载力和破坏时的裂缝形态等。将改进后的板块平衡法的计算值与试验结果进行了对比,吻合较好,适于工程设计应用。A new method, called segment equilibrium method, is proposed based on yield line theory to calculate the limit load-carrying capacity of one-way concrete slabs at large displacement. In this method, the vertical component of steel forces at the hinge-line section, which is considered as the explanation of tensile membrane effect in the one-way slabs, is incorporated into the equilibrium equation of each rigid body divided by the hinge-line. To validate the method, six one-way slab static loading tests with three types of boundary conditions were conducted. The load-deflection curves, ultimate bearing capacity and failure patterns were obtained. The calculation results by the proposed method are in good agreement with the experimental results. So this method is applicable for engineering design.

关 键 词：土木工程 受拉薄膜效应 板块平衡法 混凝土单向板 大变形 

分 类 号：TU375[建筑科学—结构工程]