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土-结构联合动力体系是非正交阻尼系统,本文建立了这种非正交阻尼系统地震反应的非经典振型分解反应谱方法,并提出了各非经典振型谱反应的组合公式。这种反应谱方法包含两个反应谱——实部反应谱和虚部反应谱。当假定地震加速度为具有平缓的功率谱平稳随机过程时,上述两个反应谱近似相等。对EL Centro(1940)和天津(1976)地震记录的计算也表明了这一点。对实际高层建筑和高耸结构的计算表明,该法计算简便,易为实际工程抗震分析所应用。 这种方法适用于诸如流体-结构、流体-土-结构以及不同性质材料组成的组合结构等任何非正交阻尼系统的地震反应分析。
The soil-structure combined dynamical system is a non-orthogonal damping system. This paper establishes the non-classical mode decomposition response spectrum method for the seismic response of this non-orthogonal damping system, and proposes the combined formulae for the spectral responses of each non-classical mode. This response spectrum method contains two response spectra—the real response and the imaginary response. When the seismic acceleration is assumed to be a smooth power spectrum stationary random process, the above two response spectra are approximately equal. Calculations of the EL Centro (1940) and Tianjin (1976) seismic records also show this. The calculation of actual high-rise buildings and towering structures shows that this method is simple and easy to use for practical engineering seismic analysis. This method is suitable for seismic response analysis of any non-orthogonal damping system such as fluid-structure, fluid-soil-structure, and composite structures composed of different materials.