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土壤—结构相互作用体系的地震位移反应基本上是由该体系的第一振型所控制的。因此,对土壤—结构相互作用体系的基频及第一振型阻尼比进行近似计算有着重要的工程意义。 关于相互作用体系的基频,Velitsos[2]及Bielak[3]都曾提出过近似计算公式。但这些式子均失之过繁,运用起来甚为不便,特别是对于基础有埋深的结构,若不用计算机则简直无法进行计算,而且他们都只给出了土壤—单层结构相互作用体系的近似计算公式。
Earthquake displacement response of the soil-structure interaction system is basically controlled by the first mode of the system. Therefore, the approximate calculation of the fundamental frequency and first mode damping ratio of soil-structure interaction system has important engineering significance. Regarding the fundamental frequency of the interaction system, Velitsos [2] and Bielak [3] have all proposed approximate calculation formulas. However, these formulas are too complex and too inconvenient to use. Especially for structures with deep foundations, it is simply impossible to perform calculations without using computers, and they only give the soil-monolayer structure interaction system. The approximate calculation formula.