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在工程抗震设计领域,以SHAKE为工具的场地反应分析已得到广泛应用。场地反应分析简单、易行,然而要得到准确、可靠的分析成果仍需要长期的经验积累和相当的技巧。其中需特别注意的是:场地反应分析所需要的各土层参数均具有相当大的不确定性。这些不确定因素主要来自于:初始剪切模量G0(或最大剪切模量Gmax)、剪切模量衰减曲线、阻尼曲线以及可能存在的软弱土层。对于大型基建工程,场地反应分析的成果对于整个工程的安全、经济性都有重大影响;因此,针对其不确定性应该进行严谨地论证,并在工程设计中充分考虑。建议对各主要参数进行敏感度分析,并将结果综合起来以形成一套理性、可靠的场地反应分析方法。
In the field of engineering seismic design, SHAKE as a tool for site reaction analysis has been widely used. Site response analysis is simple and easy, yet accurate and reliable analytical results still require long-term experience and considerable skill. Among them, special attention should be paid to the fact that all the soil parameters required for site response analysis have considerable uncertainties. These uncertainties mainly come from the initial shear modulus G0 (or the maximum shear modulus Gmax), the shear modulus attenuation curve, the damping curve and the possible weak soil layers. For large-scale infrastructural projects, the results of site response analysis have a significant impact on the safety and economy of the entire project; therefore, the uncertainty should be rigorously demonstrated and fully considered in engineering design. It is suggested to conduct sensitivity analysis on the main parameters and to combine the results to form a rational and reliable site response analysis method.