【摘要】 考虑地震的随机性和土体的非线性,引入粘弹性边界和正交试验法,提出了一种在谐响应分析中直接输入加速度的加载方式,建立了基于虚拟激励法、等效线性化法和确定性动力有限元法相结合的非线性桩-土体系的随机地震响应的参数敏感性分析方法。研究了桩土模量比、地震动输入水平、桩的长径比等无量纲参数对随机响应的影响。结果表明:桩土模量比是最敏感的因素。更多还原

【Abstract】 Considering the randomness of earthquakes and the nonlinearity of soil,introducing the viscous-spring boundary and the orthogonal trial method,the loading pattern of inputting acceleration directly in harmonic response analysis is proposed,and the parametric sensitivity analyses of stochastic vibration response for pile-soil interaction system based on pseudo-excitation method,equivalent linearization method and deterministic dynamic finite element method are researched.The parametric sensitivity analyses of the pile-soil system with respect to pile-soil modulus ratio,earthquake design level,and pile slenderness ratio are accomplished in detail.The results showed that the pile-soil stiffness ratio is the most sensitive one among three factors.更多还原