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传统等效线性化波动法主要的缺陷之一,是当基岩输入地震动较强时,高频段算得的频响放大倍率比实际场地的实测结果明显偏低.该缺陷可能导致低估重大工程的设计地震动参数的严重后果,因而是亟待解决的重要问题.本文认为,现行基于土的剪切模量和阻尼比的频率相关性修正等效剪应变的做法有其合理性,但不便应用并可能具有较大的不确定性;由于震级可以影响地震动的频谱特征,通过震级调整等效剪应变的做法也可视为按照频率调整等效剪应变.由于距离与震级一样也可以影响地震动的频谱特征,本文提出通过震级M和距离R参数修正等效线性化的方法EQLM(M,R),并用算例说明,等效线性化方法的上述缺陷可以通过本文提出的EQLM(M,R)方法得到一定程度的改善.
One of the main shortcomings of the traditional equivalent linearized wave method is that when the input ground motion of the bedrock is strong, the frequency response magnification calculated by the high frequency band is obviously lower than the actual measured value, which may lead to underestimation of major projects The serious consequence of designing ground motion parameters is therefore an important issue to be solved urgently.This paper considers that the current practice of modifying the equivalent shear strain based on the frequency dependence of shear modulus and damping ratio is reasonable but inconvenient to apply May have greater uncertainty; because the magnitude can affect the spectral characteristics of ground motions, adjusting the equivalent shear strain by magnitude may also be considered as adjusting the equivalent shear strain by frequency. Since the distance and magnitude also affect ground motion In this paper, we propose a method ELCM (M, R) that modifies the equivalent linearization through the magnitude M and the distance R parameters. The example shows that the above defect of the equivalent linearization method can be solved by the EQLM (M, R ) Method has been somewhat improved.