考虑约束作用的混凝土柱耐火试验加载方式研究  

Study on Loading Method of Fire Test for Reinforced Concrete Frame Column Considering Constraint

作　　者：施涵远 蔡新江[1,2] 毛小勇[1,2] 陈鑫[1,2] 田石柱[1,2] SHI Hanyuan;CAI Xinjiang;MAO Xiaoyong;CHEN Xin;TIAN Shizhu(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011

出　　处：《防灾减灾工程学报》2024年第1期202-209,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51778395);江苏高校“青蓝工程”(2018);江苏省“333工程”(2018);江苏省研究生科研创新计划项目(KYCX22_3286)资助。

摘　　要：为找到一种在构件耐火试验中能有效考虑整体结构对受火构件约束作用的加载方式,建立了2层2跨的钢筋混凝土框架和受火单柱的有限元模型,对比分析荷载比为0.2、0.4和0.6时,恒载、变位移加载、变力加载和交互加载方式下受火单柱与整体结构的内力、变形和耐火极限的差异。研究结果表明:恒载单柱不能准确反映整体结构受火柱的变形、轴力和耐火极限;变位移加载和变力加载在荷载比为0.2时能较好考虑整体结构中的约束作用,在荷载比为0.4和0.6时误差增大也不能准确反映整体结构的抗火性能;交互加载的相对误差随荷载比增大而增大,且最大误差小于20%。恒载、变位移加载、变力加载和交互加载中,交互加载可以较好考虑整体结构中的约束作用,近似达到整体结构试验的效果。In order to find a loading method that can effectively consider the constraint of the whole structure in the component fire resistance test,the finite element models of a two-story two-span rein-forced concrete frame and a single column subjected to fire were established.The differences in inter-nal force,deformation and fire resistance limit between the single column and the whole structure un-der constant loading,variable displacement loading,variable force loading and interactive loading were compared and analyzed when the load ratios are 0.2,0.4 and 0.6.The results show that the sin-gle column under constant load cannot accurately reflect the deformation,axial force and fire resis-tance limit of the overall structure.The constraint in the whole structure can be considered by variable displacement loading and variable force loading when the load ratio is 0.2.The fire resistance of the whole structure cannot be performed accurately with an increasing error when the load ratio is 0.4 and 0.6.The relative error under interactive loading increases with the increase of load ratio and the maxi-mum error is less than 20%.Among the constant loading,variable displacement loading,variable force loading and interactive loading,the constraint in the whole structure can be better considered by interactive loading,approximately achieving the effect of the whole structure test.

关 键 词：钢筋混凝土框架 结构抗火 试验方法 构件试验 加载方法 

分 类 号：TU375.4[建筑科学—结构工程]