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土-结构动力相互作用体系的阻尼主要包括上部结构的阻尼和地基土的阻尼。对于上部结构的阻尼,目前大都采用瑞雷阻尼,研究相对成熟。因而本文主要针对地基土阻尼的计算方法展开探讨。本文拟通过典型算例,计算分析由经典阻抗函数经验公式所确定地基土阻尼值及存在的不足。计算分析表明:传统阻抗函数经验公式确定地基土阻尼过大,特别是针对质量和刚度较大的结构(如核电站等)时,会出现超阻尼现象。基于此,在进行质量和刚度较大的结构(如核电站等)的抗震分析时,建议采用德国标准所规定的截止阻尼方法(竖向30%、水平15%)以考虑地基土的阻尼。本研究具有较强的实用性,研究成果可为土-结构动力相互作用体系动力分析中阻尼特性的考虑提供指导。
The damping of soil-structure dynamic interaction system mainly includes the damping of superstructure and the damping of foundation soil. For the damping of the superstructure, the current use of Rayleigh damping, research is relatively mature. Therefore, this paper mainly discusses the calculation method of foundation soil damping. This paper intends to calculate and analyze the damping value and the deficiency of the foundation soil determined by the empirical formula of the classical impedance function through a typical example. The calculation and analysis show that the traditional empirical formula of impedance function determines that the damping of foundation soil is too large, especially for the structures with high mass and rigidity (such as nuclear power plants). Based on this, it is recommended to adopt the method of cut-off damping (vertical 30%, horizontal 15%) as specified by the German standard for the seismic analysis of subgrade soils with high mass and rigidity (such as nuclear power plants). The research has strong practicality and the research results can provide guidance for the consideration of the damping characteristics in the dynamic analysis of the soil-structure dynamic interaction system.