考虑薄膜效应区域的混凝土双向板承载力计算  

Calculation of the carrying capacities of concrete two-way slabs considering the membrane action region

作　　者：王勇[1,2] 姜亚强[1] 李凌志 龙帮云 WANG Yong;JIANG Yaqiang;LI Lingzhi;LONG Bangyun(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221008,Jiangsu China;Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou 221008,Jiangsu China;School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点试验室,江苏徐州221008 [2]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221008 [3]同济大学土木工程学院,上海200092

出　　处：《华中科技大学学报（自然科学版）》2021年第1期93-98,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：中央高校基本科研业务费专项资金资助项目(2019XKQYMS32);国家自然科学基金青年基金资助项目(51408594);徐州市自然科学基金资助项目(KC19014);中国矿业大学/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开放基金资助项目(SKLGDUEK1909);应急管理部消防救援局重点攻关项目(2020XFZD14)。

摘　　要：为了合理确定混凝土双向板极限荷载和薄膜效应区域,进行了6块混凝土双向板承载力试验研究,观察试验板裂缝开展和最终破坏模式,获得了试验板荷载-位移曲线.在此基础上,基于塑性铰线理论,考虑受拉薄膜效应影响,提出新的混凝土双向板破坏模式,建立确定受拉薄膜效应区域的椭圆方程,推导板块内力平衡方程,获得各板块承载力增大系数.同时,编程计算混凝土板荷载-变形关系,分析薄膜效应机理,并用于验证理论方法有效性.最后,将理论计算结果与国内外试验结果及理论结果进行对比,表明:提出的破坏模式与传统拉压薄膜效应机理相一致,可用于确定混凝土双向板极限承载力、拉压薄膜效应区域和最终破坏模式.To reasonably determine the ultimate load and membrane action region of concrete two-way slabs,the bearing capacities of six tested concrete two-way slabs were conducted,including the cracks and failure mode,the load-deflection curves.Based on the yield line theory and the membrane action method,the new two-way slab failure mode and the elliptic equations were established to determine the tensile membrane action region,and the internal force equilibrium equations were deduced to solve the load enhancement factors of different segments.Meanwhile,the procedure was programmed to predict the load-deflection curve and the membrane action,and the numerical results were used to verify the effectiveness of the proposed theoretical method.Finally,the results of proposed theoretical method were compared to the experimental results in the literature and other theoretical methods.Results show that the proposed failure mode and mechanical mechanism are conform to the conventional membrane action,which can be used to determine the ultimate carrying capacities,the tensile and compressive membrane action region and the final failure mode of the concrete two-way slabs.

关 键 词：混凝土双向板 极限承载力 薄膜效应 破坏准则 应变 

分 类 号：TU375[建筑科学—结构工程]