This paper proposed a simplified procedure for predicting the amplification factor based on a new empirical model for estimating the site period considering nonlinear strain range of soil. The analysis results suggested the depth to bedrock of the soil profile affects the site period at certain shaking intensity levels. Considering this finding, we first proposed a new empirical model to estimate the site period by propagating 78 input motions through 119 soil profiles. A statistical method confirmed the accuracy of the proposed empirical method, which represents the effect of both dynamic properties of soil and input motion features on site response. We then presented a simplified procedure for predicting the amplification factor by taking to account the site period shift and soil nonlinear behavior due to the interaction of damping increase and the resonance controlling effect. Finally, the accuracy of the simplified procedure results in predicting the amplification factor was evaluated by considering the equivalent linear and nonlinear approaches. The results revealed that the simplified model captures the trends of equivalent linear site response analyze in predicting the amplification factor with acceptable accuracy.

本文提出了一种基于新的经验模型的简化方法，用于在考虑土的非线性应变范围的情况下估算工期，从而简化了放大系数的估算程序。分析结果表明，在一定的振动强度水平下，土壤剖面的基岩深度会影响工期。考虑到这一发现，我们首先提出了一个新的经验模型，通过传播119种土壤剖面中的78种输入运动来估算场地周期。统计方法证实了所提出的经验方法的准确性，该方法代表了土壤动力特性和输入运动特征对场地响应的影响。然后，我们考虑到由于阻尼增加和共振控制作用的相互作用而引起的场地周期变化和土壤非线性行为，提出了一种简化的放大系数预测程序。最后，通过考虑等效的线性和非线性方法，评估了简化程序可预测放大因子的准确性。结果表明，简化模型捕获了等效线性位点响应分析的趋势，从而以可接受的精度预测了放大因子。