钢筋混凝土简支梁高温力学性能的试验研究  

Experimental study on mechanics performance of the simple RC beams after high temperature

作　　者：向延念[1] 李守雷[2] 徐志胜[2] 

机构地区：[1]中南大学勘测设计研究院 [2]中南大学防灾所,长沙410075

出　　处：《华北科技学院学报》2006年第1期57-61,共5页Journal of North China Institute of Science and Technology

基　　金：国家"十五"科技攻关项目:小城镇基础设施防灾减灾关键技术研究(2002BA806B03);湖南省科技攻关重点项目:大中型城市火灾安全及建筑结构快速修复研究(01SSY1007)

摘　　要：通过对8根足尺钢筋混凝土简支梁进行火灾模拟试验,并对构件高温冷却后进行破坏性试验,得到了构件在高温作用下的温度场分布、变形规律和构件在不同的配筋、不同的冷却方式和不同的升温时间下的剩余极限承载力,并对各种工况下的构件受损程度进行了对比分析。试验结果表明,构件保护层厚度越小,升温时间越长,配筋率越低,则火灾对梁的损伤程度越大,喷水冷却构件剩余极限承载力较炉中冷却剩余极限承载力大。Based on the experimental results of eight full scale simple RC beams under fire, the temperature distribution on the section and the member deformation is obtained in this paper. Through the destructive experiment of the beams after cooling, the residual bearing eapacity of the members at different reinforced ratio, different methods of cooling and different heating time is obtained, and the damage degree of the members at different operating mode is compared and analyzed, The experimental results showed that the damaged degree of beams under high temperature is increased with the heating time, and decreased with the thickness of the beam＇s safeguard layer and the rdnforcement ratio, it also showed the beams cooled by water had more residual bearing capacity than those cooled in furnace.

关 键 词：钢筋混凝土梁 高温 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]