多层滑移隔震建筑结构的简化模型及其分析精度

多层滑移隔震结构可通过广义双自由度模型(单自由度或双自由度模型)进行简化计算分析。本文首先由振型分解 理论,探讨了滑移隔震结构双自由度简化模型分析参数质量比的取值,在此基础上,通过数值试验的方法,研究了在不同 地震波类型、地震波幅值、结构层数、上部结构固有周期、滑移摩擦系数和模型分析参数质量比影响因素下,广义双自由度 模型对多层滑移隔震结构最大滑移位移的计算精度和适应性。研究表明,上述各因素对模型的分析精度都有影响,其中上 部结构基本周期和模型分析参数质量比为两个较敏感因素。本文由此建议了一个优化分析参数双自由度模型,该模型可 分析上部结构固有周期小于1s结构的最大位移反应,其误差可控制在14％以内。

The simplified models and their precision for analysis of multi-story sliding isolated structures

The computation and analysis of response of multi-story sliding isolated structures can be simplified using the generalized double-mass model (double-mass model or single-mass model). This paper first discussed the selection of mass ratio of double-mass model for sliding structures by use of the mode decomposition theory, in this base, through the numerical experimentation method, studied the precision and applicability of the generalized double-mass models under different levels of factors of the earthquake wave types, earthquake wave amplitudes, story numbers of sliding structures, natural periods of the superstructure, sliding friction coefficients and mass ratios. The research indicated that all these factors have influences on the model precision, the natural period of the superstructure and mass ratio of the analysis model are the most sensitive two factors to the model precision. This paper suggested an optimized mass ratio for double-mass model, and the model is applicable for analyzing the maximum displacement response of sliding base-isolated buildings with natural period of the superstructure less than 1 s, and the error of the model of sliding displacement response can be restricted within 14%.