基于耐震时程法的钢筋混凝土框架弹塑性地震响应及损伤发展

耐震时程法（ETA）仅需少量的非线性时程分析，便可以掌握结构倒塌破坏的全过程。但是，此方法目前较少应用于结构倒塌失效分析。本文探讨了耐震时程曲线的特性及拟合思路，以钢筋混凝土框架为研究对象，应用ETA方法分析了钢筋混凝土框架的地震响应及损伤发展。研究结果:（1）混凝土框架结构的地震响应分析结果表明:采用ETA方法分析时结构顶点位移和层间位移角与采用IDA方法分析时接近，而最大基底剪力会略大；但是，两种方法的结果相关系数均接近于1。（2）强震下的结构倒塌分析结果表明:ETA方法能较为准确的预测结构的塑性铰分布、塑性铰出现概率及塑性铰发展顺序。当采用多条耐震时程加速度曲线作为输入时，评估结果准确性更高。由于ETA方法仅需进行少量几条耐震时程分析且计算高效，因此ETA方法可以成为预测结构失效模式的高效方法。

Seismic response and damage development of reinforced concrete frames by endurance time analysis method

The endurance time analysis method(ETA),based on a few nonlinear time history analysis,could describe the whole process of destruction of structures. However,it is rarely applied to failure and collapse analysis of structures at present. In this paper,the characteristics and fitting method of endurance time history curve have been firstly discussed. Secondly,seismic response and seismic damage development of a reinforced concrete frame were obtained by ETA method. The study results are as follows:(1)The seismic response analysis results of the concrete frame structure indicate that the top displacement and interlayer displacement angle of using ETA method and IDA method were close,but the maximum base shear will be slightly larger. However,the correlation coefficients of the results of the two methods are close to 1.(2)Structural collapse analysis under strong earthquake show that the plastic hinge distribution,the occurrence probability of plastic hinge and the development sequence of plastic hinge could be accurately predict by ETA method. And the evaluation results will be more accurate when more endurance time acceleration functions are input. Since the ETA method only needs a few endurance time-history analyses and calculation effectively,this method is able to effectively and accurately predict structural failure mode.