型钢混凝土柱火灾后恢复力计算模型  

RESILIENCE MODELS OF POSE-FIRE SRC COLUMNS

作　　者：张超[1] 王广勇[2] 薛素铎[1] 李雄彦[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]中国建筑科学研究院,北京100013

出　　处：《工程力学》2016年第12期196-205,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51278477);国家科技支撑计划课题项目(2014BAL05B04);中国建筑科学研究院自筹基金项目(20120106330730073)

摘　　要：根据8根大比例型钢混凝土柱试件温度场和火灾后抗震性能试验结果,考虑受火时间、轴压比的影响,通过理论推导和回归分析,提出了开裂点、屈服点、峰值点和极限点为特征点的型钢混凝土柱恢复力-位移骨架曲线,并给出了这些特征点的计算公式。同时,通过试验数据的回归,得出卸载刚度与弹性刚度之间的关系。在上述工作的基础上提出了火灾后型钢混凝土柱的四线型荷载-位移恢复力模型。研究表明:建议的四线型恢复力模型与试验结果吻合较好,可用于火灾后型钢混凝土柱抗震性能的评估以及非线性地震反应分析。Based on the temperature field and post-fire aseismic performance test results of 8 large-scale steel reinforced concrete（SRC） columns, the load-displacement skeleton model defined by key points including a cracking point, a yield point, a peak point, and an ultimate point is proposed considering the influence of fire duration and axial load ratio. The formulas to calculate these points are recommended through theoretical analysis and data regression. Meanwhile, the relationship between unloading rigidity and elastic rigidity is suggested through data regression. A four-linear restoring force model is put forward on the basis of the above work. It can be concluded that the calculated restoring model agrees well with the test result, which can be applied to estimating the seismic behavior and nonlinear dynamic analysis of post-fire SRC columns.

关 键 词：型钢混凝土柱 火灾后 恢复力模型 受火时间 轴压比 

分 类 号：TU398.9[建筑科学—结构工程]