配筋率对连续板抗火性能的影响  

Effects of reinforcement ratio on fire resistance of concrete slab

作　　者：郝淑英[1] 刘秀英[2] 张琪昌[2] 

机构地区：[1]天津理工大学机械学院,天津300191 [2]天津大学力学系,天津300072

出　　处：《武汉大学学报（工学版）》2008年第6期66-69,共4页Engineering Journal of Wuhan University

基　　金：天津市高校科技发展基金项目(编号:20040505);火灾科学国家重点实验室资助项目(编号:HZ2005-KF05)

摘　　要：采用理论分析与有限元分析相结合的方法,研究了钢筋混凝土连续板配筋率及负筋长度对楼板抗火性能、裂缝分布及破坏模式的影响.发现配筋率过大或过小都会降低结构的抗火性能,建议最佳取值为0.598%;负筋长度对裂缝分布规律、楼板的破坏形态、变形以及破坏铰的位置有很大的影响,负筋的长度为板计算跨长的1/3时,楼板的抗火性能最佳.The effects of reinforcement ratio and length of negative moment reinforcement of three-span continuous reinforced concrete slab on fire resistance, crack and failure mode are investigated by theorytical analysis and finite element method. It is discovered that： 1） higher or lower reinforced ratio isn＇t beneficial to the fire resistance of slab; the optimal value is 0. 598%. 2） length of negative moment reinforcement has significant effect on crack distribution, failure mode of slab, deformation and the position of destroy hinge. The concrete slab can obtain its best fire resistance when the length of negative moment reinforcement is 1/3 of span.

关 键 词：配筋率 负筋长度 三跨连续板 火灾 

分 类 号：TU3[建筑科学—结构工程]