土-结构非线性相互作用体系演变随机过程响应分析

RESPONSE ANALYSIS OF THE SOIL-STRUCTURE INELASTIC INTERACTION SYSTEM UNDER EVOLUTIONARY RANDOM EXCITATIONS

在假定结构体系受到非均匀调制的演变随机激励基础上,考虑到地震动强度和频谱非平稳特性,应用等效线性化方法分析了土-结构相互作用体系在演变随机激励下的响应演变谱和时变均方根响应,给出了一种实用计算方法,再通过示例叙述了此方法的实施过程。计算结果表明,地震动频谱非平稳特性对非线性相互作用体系响应有较大的影响。

The evolutionary random excitation acting on structures is assumed to be non-uniformly modulated. The nonstationary characters of earthquake motion of intensity and frequency are considered, and the soil-structure interaction system is analysed by equivalent linearization method. The evolutionary spectra and time-variant cross-correlation function of the response for the soil-structure interaction system are obtained, and one utihty method of calculation and its process are also given. The numerical example shows that the inelastic response of the soil-structure interaction system is affected significantly by the characters of the frequency non-stationarity of seismic ground motion.