【摘要】 开展了土-结构动力相互作用的模型试验,探讨了框架结构的近似有效基本周期,并研究了考虑相互作用效应的界限。模型试验中分别进行了刚性地基和柔性地基条件下的结构基本周期测试,并通过与理论计算结果的比较,验证了FEMA450中建议的有效基本周期计算方法能够有效预测土-结构相互作用效应的影响。利用FEMA450中建议的刚性地基上普通钢筋混凝土框架结构基本周期近似值的计算式,分别建立了明置基础、埋置基础的框架结构有效基本周期近似值的计算式,并以此分析了框架结构考虑相互作用的界限问题,提出了考虑埋置深度影响的合理界限。更多还原

【Abstract】 This paper includes an investigation on a model test for dynamic soil-structure interaction,the approximate effective fundamental period and the limit of considering the dynamic soil-structure interaction.A frame model test with fixed-base and flexible-base is presented,and the approaches proposed in FEMA450 can reliably predict the influence of soil-structure interaction on fundamental period by comparing the test results and the calculated results.By using the approximate fundamental period of frame structure with fixed-base proposed in FEMA450,the methods of the approximate effective fundamental period are developed for foundations supported at the surface and embedded foundations,respectively.Then the limit of considering the dynamic soil-structure interaction is discussed,the effect of the depth of embedment is taken into account,and the rational limits are proposed.更多还原