隔震结构分析的等效迭代CCQC反应谱方法

针对隔震结构地震响应分析,提出了一种修正的CCQC (complex complete quadratic combination)反应谱法。鉴于常规CCQC反应谱方法应用中等效参数选择的困难,构造了通过迭代确定隔震支座合理等效力学参数的新算法——等效迭代CCQC反应谱法。采用该方法对一栋七层基础隔震框架结构进行响应计算,并与非线性时程法和常规CCQC反应谱法进行结果比较和分析,验证了方法的可行性和合理性。结果表明:本文方法可排除常规分析中隔震层等效刚度与阻尼参数选择的主观因素影响,有效提高分析精度和计算可靠性。

A CCQC Response Spectrum Method with Iterative Linearization for Seismically Isolated Structures

An iterative procedure was developed for the determination of equivalent linear stiffness and damping parameters of isolation bearings in the analysis of seismically isolated structures using CCQC (Complex Complete Quadratic Combination) response spectrum method, and a new response analysis method with iterative linearization was proposed. An example of a seven-story base-isolated frame structure was presented to demonstrate the feasibility and effectiveness of the proposed method. Numerical results of the new method were compared with those from the nonlinear transient dynamic analysis and the conventional CCQC method. It is shown that the proposed method can exclude influence of subjective factors in choosing equivalent linear stiffness and damping parameters of the isolation layer, and therefore improve the analysis accuracy and reliability.