层间隔震结构简化模型地震响应计算方法研究

建立了层间隔震结构双质点系简化计算模型,研究了简化模型的动力特性及地震响应对模型质量比、周期比的敏感性,推导了模型参数的简化算式,提出了基于非比例阻尼的层间隔震结构的简化计算方法,并用实例验证了方法的可靠性和实用性。结果表明:层间隔震结构的动力特性与上下部结构质量比及周期比密切相关,并且可以反映层间隔震的高阶振型特点。利用本文提出的简化计算方法,可快速估计层间隔震结构的地震响应,方法概念清晰、计算简单且具有一定精度。

Seismic Response Calculation Method for Inter-story Isolation System based on Simplified Model

Two-particle simplified calculation model of inter-isolated structure is proposed. In the meantime, simplified formula of model parameters is derived based on the study of two aspects, including dynamic characteristics of two-particle simplified calculation model and the sensibility of seismic responses to the quality ratio and period ratio of model. In order to verify the reliability and practicability of research results proposed in this paper, an engineering example is put forward based on the comparative calculation analysis. The results show that dynamic characteristics of the inter-story isolated structure are closely related to the quality ratio and period ratio of the upper and lower structures, and also reflect the characteristics of higher order modes in the inter-story isolation. The simplified formula presented in this paper can quickly estimate the seismic response in isolated layers and the upper and lower structures adjacent to the isolated layers. This method generated from the dynamic characteristics of two-particle simplified calculation model has a clear concept, simple calculation logic and certain accuracy.