火灾高温下RC简支梁极限弯矩计算模型研究  

Calculation Method for Ultimate Moment of RC Simply Beam Under Fire

作　　者：张岗[1] 贺拴海[1] 任伟[1] 赵小星[1] 桂学[1] 

机构地区：[1]长安大学交通行业旧桥加固与检测重点试验室,西安710064

出　　处：《武汉理工大学学报（交通科学与工程版）》2010年第1期134-136,140,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家交通部西部交通建设科技项目资助(批准号:200531881215200731881232)

摘　　要：通过截面力学平衡原理,引入火灾高温下混凝土和钢筋强度折减系数,给出截面有效分布宽度,推导得有效力矩法及相应力矩时效系数计算方法,建立火灾高温下钢筋混凝土简支梁极限弯矩的实用计算模型,与有限元分析数据进行对比,结果吻合.研究表明:保护层厚度对钢筋混凝土简支梁极限弯矩影响较大,钢筋混凝土简支梁极限弯矩随保护层厚度的增加呈线性递增关系,该计算方法可行.Based on mechanical balance principle and load ration parameter, reduction coefficient on concrete and reinforcement exposed to fire is adopted to put forward effective moment calculation method and effective moment calculation coefficient on the basis of effective width of section, a practical method is proposed for calculating the fire resistance of reinforced concrete bending element subjected to fire in three sides. A case has verified cate that：The protective layer thickness and its accuracy and simplification. ration of reinforcement have a The analysis results indi great effect on the fire re sistance of reinforced concrete beam bridge , the fire resistance of reinforced concrete beam bridge increases linearly with the increase of protective layer thickness, the calculation methods is reasonable.

关 键 词：桥梁工程 极限弯矩 时效系数 计算方法 

分 类 号：TU375.1[建筑科学—结构工程] TU352.5