火灾下型钢混凝土柱的受力全过程分析  

Full-range Analysis of Steel Reinforced Concrete Column Subjected to Fire

作　　者：谭清华[1,2] 韩林海[2] 周侃[2] 

机构地区：[1]国防科学技术大学土木工程系,长沙410072 [2]清华大学土木工程系,北京100084

出　　处：《防灾减灾工程学报》2015年第1期63-68,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金："十二五"国家科技支撑计划项目(2012BAJ07B01);国家自然科学基金项目(51308539)资助

摘　　要：实际结构从正常使用到遭受火灾作用,至火灾后进行维修加固,其结构受力经历了常温、升温、降温和火灾后4个阶段(简称结构受力全过程)以及火灾升、降温作用阶段(简称火灾作用全过程)。基于上述结构受力和火灾作用的全过程,建立了全过程火灾作用下型钢混凝土柱力学性能分析的有限元模型,分析了全过程火灾作用下型钢混凝土柱的温度—时间关系、轴向荷载—位移关系和截面内力分布等。研究结果表明,不考虑外荷载和火灾升、降温共同作用得到的火灾后剩余承载力和对应的峰值位移结果偏于不安全;在结构受力全过程和火灾作用全过程中,型钢混凝土截面各材料之间发生了应力重分布。The practical building structure subjected to combined loading and fire is successive process from normal service to subjection to fire and strengthening, which includes the full-range loading with ambient temperature, heating, cooling and post-fire phases, and the full-range fire with heating and cooling. Based on the whole process loading and fire, a finite element analysis （FEA） model for steel reinforced concrete column （SRCC） under the full-range fire were estab- lished and validated by the corresponding tests. After that, based on the verified FEA model, the temperature distributions, the axial deformations and the internal force redistribution were ana- lyzed. This is helpful to investigate the residual load bearing capacities of the SRC columns. The results show that without the combined loading and fire including heating and cooling phases, the post-fire residual load bearing capacities of the SRC columns and the corresponding peak displace- ment are non-conservative, and the internal forces redistribute in the section occurs under the full-range loading and fire.

关 键 词：型钢混凝土柱(SRCC) 全过程火灾 有限元模型 力学性能 

分 类 号：TU398.9[建筑科学—结构工程]