基于钢筋应变差的混凝土双向板极限状态分析方法  

ANALYTICAL METHOD FOR ULTIMATE STATE OF TWO-WAY CONCRETE SLABS BASED ON STEEL STRAIN DIFFERENCE

作　　者：王勇[1,2] 张亚军[1] 龙帮云[2,3] 马帅[1] 张苏河 袁广林 WANG Yong;ZHANG Ya-jun;LONG Bang-yun;MA Shuai;ZHANG Su-he;YUAN Guang-lin(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology,China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;Jiangsu Collaborative Innovation Center for Building Energy Saving and Construct Technology, Xuzhou, Jiangsu 221008, China)

机构地区：[1]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 [2]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 [3]江苏建筑节能与建造技术协同创新中心,江苏徐州221008

出　　处：《工程力学》2019年第1期104-118,共15页Engineering Mechanics

基　　金：国家青年自然科学基金项目(51408594);中国博士后科学基金项目(2014M560461);中国博士后科学基金特别资助项目(2016T90525);中央高校基本科研业务费专项基金项目(2018QNB10);江苏建筑节能与建造技术协同创新中心资助项目(SJXTQ1614)

摘　　要：为了合理确定混凝土双向板荷载-变形关系及极限状态,该文进行了一足尺混凝土双向板承载力试验研究,观察试验板裂缝开展及破坏模式,对荷载-变形关系、钢筋应变和板角约束力进行了测量。在此基础上,基于塑性铰线理论,考虑受拉薄膜效应,提出钢筋应变差概念、钢筋和混凝土应变破坏准则,结合板块内力平衡方程和弯矩平衡方程,建立混凝土双向板荷载-变形关系和极限荷载计算方法。同时,结合板壳有限元理论,编程计算混凝土板荷载-变形关系,分析薄膜效应机理及钢筋应变,并用于验证该文理论方法的合理性。最后,将该文理论方法计算结果与国内外试验结果以及其他理论结果进行对比。结果表明:与试验结果和其他理论计算结果相比,该文理论方法原理简单,计算容易,精度满足要求,可用于确定混凝土双向板的极限状态。To reasonably determine the load-deflection and ultimate state of two-way concrete slabs,a test for a full-scale two-way concrete slab was conducted,including the cracks and failure mode,the load-deflection,steel strain and corners’restraint forces.Based on the test results,by solving the force and moment equilibrium equations and considering the tensile membrane action,one theoretical method was established according to the yield-line theory,the proposed steel strain difference,concrete and steel strain failure criteria to predict the slabs’load-deflection and the limit loads.Meanwhile,according to the shell finite element,the nonlinear procedure was developed to predict the load-deflection,the membrane mechanics and steel strains of the concrete slabs,and the rationality of the present theoretical method was verified.The comparison of the results predicted by the presentmethod with other methods and the test results was conducted.The result shows that:compared with the testresults and other methods,the present theoretical method is simple and easy to calculate,and it is capable ofpredicting the ultimate state of two-way concrete slabs with reasonable accuracy.

关 键 词：混凝土双向板 理论方法 有限元 薄膜效应 极限状态 应变 

分 类 号：TU375.2[建筑科学—结构工程]