土-结构动力相互作用体系阻尼及地震反应分析

通过全面考虑土-结构动力相互作用体系中上部结构阻尼、地基土黏滞材料阻尼以及地基基础平动与转动时的辐射阻尼，推导了土-结构相互作用体系的耦合阻尼比公式。结合国内外关于阻尼调整系数的研究成果，提出了基于加速度反应谱的阻尼影响因子概念，建立阻尼影响因子 与《规范》中地震影响系数 的关系式。通过耦合阻尼比公式以及提出的 与 的关系式，对土-结构相互作用体系地震作用加以研究。结果表明考虑土与上部结构的相互作用后能够增大体系的阻尼性能，并大大降低上部结构的地震作用，提高体系的整体抗震性能。其成果为未来抗震防灾研究与工程的抗震设计提供了理论依据。

Study of damping property and seismic action effect for soil-structure dynamic interaction system

Through investigating the property of structure damping, material viscous damping of soil and the radiation damping of foundation considering translation and rocking, the coupling damping ratio and the damping reduction factor of the soil-structure- interaction system are deduced. Based on studying of the relationship between damping reduction factor and seismic influence coefficient , it is shown that it will improve the damping property and earthquake-resistant capability, and reduce the earthquake action of the SSI system, so as to provide a theoretical basis for the aseismatic researches and aseismic designs.