装配式混凝土梁受火后抗弯承载力可靠度  

Reliability of bending capacity of precast concrete beam after fire

作　　者：蔡斌[1] 李波[1] 张博[1] 武安盛 

机构地区：[1]吉林建筑大学土木工程学院,吉林长春130118

出　　处：《消防科学与技术》2017年第11期1487-1490,共4页Fire Science and Technology

基　　金：国家自然科学基金项目"纤维增强复合材料嵌入式加固混凝土结构的受弯性能"(51178206);国家自然科学基金项目"轻钢与泡沫混凝土组合结构的破坏机理研究"(51378238);住房和城乡建设部科学技术项目"装配式混凝土火灾作用下力学行为及可靠性研究"(2017-K9-047);国家重点研发计划项目"房屋拆除安全水准设置;拆除技术优化及拆除决策系统"(2017YFC0806104)

摘　　要：为了研究装配式混凝土梁受火后抗弯承载力可靠度变化的一般规律,提出基于当量正态法的可靠度分析方法。考虑荷载效应比、受火时间等因素的影响,应用有限元分析软件ABAQUS对ISO 834标准升温曲线下装配式混凝土梁温度场分布情况进行数值模拟,应用MATLAB进行可靠度数值分析。计算结果表明,随着荷载效应比的增加,装配式混凝土梁的抗弯承载力可靠度降低,受火后其抗弯承载力可靠度随着时间的增加明显降低。分析结果可为装配式混凝土梁受火后力学性能分析提供参考。In order to study the regularity of bending capacity reli ability of fire-damaged precast concrete beam, the rettability anal- ysis method based on equivalent normalize method was proposed.The load effect ratio and heating time were considered, lhe models of precast concrete beam with IS（） 834 time-temperature curve were established by software ABAQUS, tile reliabilifies were cal culated by MATLAB. The results showed that with the load effecl ratio increases, the reliability of bending capacity of precast con crete beam deelines, the tell_ability of bending capacity of fire _dam aged precast concrete beam declines sharply with the inerease of heating time. The results provided references to the mechanical performance analysis of precast concrete beam subiccled lo fire.

关 键 词：装配式混凝土梁 当量正态法 受火 荷载效应比 可靠度指标 

分 类 号：X913.4[环境科学与工程—安全科学] TU312.3[建筑科学—结构工程]