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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 experimental results of the temperature field and post-fire seismic performance of 8 large-scale steel concrete column specimens, considering the influence of the time of the fire and the axial-pressure ratio, through the theoretical derivation and regression analysis, the cracking point, yield point, peak point and limit were proposed. The restoring force-displacement skeleton curve of the steel reinforced concrete column with the point being the characteristic point, and the calculation formula of these characteristic points are given. At the same time, through the regression of test data, the relationship between unloading stiffness and elastic stiffness is obtained. Based on the above work, the four-line load-displacement restoring force model of post-fired steel concrete columns is proposed. Studies have shown that the proposed four-line type restoring force model is in good agreement with the experimental results and can be used for evaluation of seismic performance of post-fired steel reinforced concrete columns and nonlinear seismic response analysis.