Study on Behaviour of Continuous Composite Deck Slab in Different Fire Cases
The finite element method was first applied to simulate structure responses of the simple supported composite deck slab in fire. The curve of deflection against time acquired from numerical simulation agreed well with experiment result. It indicates that the numerical model is reasonable and feasible. Based on this method, the regulations of deformation, crack and internal force redistribution of three-siren continuous composite deck slabs subjected to fire in different cases were studied. The effect of length of negative bending moment reinforcement on fire behaviour of continuous slab was discussed. The results show that the continuous composite deck slab is an indeterminate structure and its fire resistance performance is better than that of simple supported slab because the reinforcements in tension are in the low temperature region and their strength can be fully utilized. The fire behaviour of continuous slab relates to the fire cases. From the viewpoint of the deformation, the fire duration performance of continuous slab is the best in middle span in fire and the worst in two adjacent spans in fire at the same time. The reaction forces vary with elevated temperature, which indicates the redistribution of the internal forces. The structure responses in complicated fire case are generally not obtained from superposition of those in simple rue case correspondingly. The endpoints of negative bending moment reinforcement are the positions of plastic hinge appeared easily. The length of negative bending moment reinforcement affects the shape and process of deformation of the slab, it does not do the final deflection. For improving the fire resistance performance of the continuous slab, it is suggested that the length of negative bending moment reinforcement is 1/2 to 2/3of span.
composite deck slab finite element method fire behaviour continuous slab
YANG Xiuping ZHANG Huaizhang YAO Bin
School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300191,China State Key Laboratory of Fire Science,University of Science & Technology of China,Hefei 230026,Anhui,
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
707-712
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）