Fire test and numerical analysis on concrete slabs with bi-axial in-plane restraints
Wang Yong1,2 Yuan Guanglin1 Wang Tengyan1 Wang Yuexiang3 Shi Weinan1
1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China;
2. JiangSu Collaborative Innovation Center for Building Energy Saving and Construct Technology, Xuzhou 221008, China;
3. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
Abstract：To analyze the fire behavior of two-way concrete slabs with bi-axial in-plane restraints, four fire tests were conducted on the full-scale rectangular concrete slabs subjected to constant loads. The test results included the temperature field along the depth of the slab, the reinforcement temperature, the out-plane and in-plane deflections, the constraint force and the failure mode of corners. In addition, a program was developed to analyze the temperature, deflection and membrane action of the tested concrete slabs. The results indicate that the cracking pattern of the slabs with bi-axial in-plane restraints is clearly different from those of the simply-supported slabs and the uniaxial restraint slabs. The in-plane restraint will induce the larger deflection and deflection ratios of the concrete slabs at the later stage of fire. The concrete slabs with different restraints have different membrane mechanism. Compared to the uniaxial in-plane restraints, the bi-axial restraint is more prone to constrain development of tensile membrane action in concrete slabs.
王勇 袁广林 王腾焱 王跃翔 史伟男 . 双向面内约束混凝土板火灾试验及数值分析[J]. 土木工程学报, 2018, 51(5): 48-59.
Wang Yong Yuan Guanglin Wang Tengyan Wang Yuexiang Shi Weinan . Fire test and numerical analysis on concrete slabs with bi-axial in-plane restraints. 土木工程学报, 2018, 51(5): 48-59.
