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目前大量用于进行土层非线性地震反应分析的等效线性化方法在考虑大震作用时,会出现过大的“共振”效应,造成对地表地震反应的误估。故常采用时域积分方法弥补其缺陷,而土体动力本构模型是决定时域积分方法优劣的关键。在此前的工作中,已提出了一种针对阻尼比拟合的修正UE土体动力本构模型,为验证修正UE模型在进行土层地震反应分析时的有效性及优越性,同时采用等效线性化方法及嵌有不同本构模型的时域积分方法进行了响嘡台阵场地的一维土层非线性地震反应分析,并将不同方法下的计算结果与实际记录进行了对比分析。最后,通过计算分析证明了修正UE模型对响嘡台阵地表地震反应的估计结果是客观有效的。
At present, a large number of equivalent linearization methods used for nonlinear seismic response analysis of soil layers can cause excessive “resonance” effect when large earthquakes are taken into consideration, resulting in miscalculation of the seismic response on the ground surface. It is often used to make up for the shortcomings of the time domain integral method, and soil dynamic constitutive model is the key to determine the merits of time domain integration method. In the previous work, a modified constitutive model of soil dynamics for UE based on damping ratio has been proposed. In order to verify the validity and superiority of the modified UE model in the analysis of soil seismic response, Linearization method and the time-domain integration method embedded with different constitutive models, the nonlinear seismic response of one-dimensional soil in the ringing platform was analyzed. The calculated results under different methods were compared with the actual records. Finally, it is proved that the estimation results of the modified UE model on the surface seismic response of the ringing platform are objective and validated through computational analysis.