【摘要】 高层建筑结构计算分析中,若结构的轴向力较大而侧向刚度较小时,P-Δ效应不可忽视;针对高层建筑结构的二阶分析,建立了考虑P-Δ二阶效应的结构动力学基本方程;并采用小波包分解,将地震输入能量分解到不同频段上,分析了不同频段范围内结构的反应以及能量的分布。并采用文中的方法对一结构进行了分析,揭示了结构地震反应能量在时频域上的分布特性。更多还原

【Abstract】 In the analysis of tall building structures, the P-++++++++++++ effect cannot beignored if the axial forces in columns are high and the lateral stiffness is weak. In accordance with the second order analysis of tall building structures, the basic dynamic equations with consideration of P-++++++++++++++ effect are established. The seismic input energy is decomposed into different frequency bands by using the wavelet packet decomposition. The seismic responses in different frequency bands and energy distribution are analyzed. A numerical analysis of a structure is carried out by using the method presented in this paper. The energy distribution characteristics of the seismic response in time-frequency domain are shown.更多还原