【摘要】 本文首先推导了李小军积分格式(中心差分与Newmark平均加速度法相结合)的增量形式,并据此离散动力平衡方程,同时,采用Pyke提出的土动力本构模型以及多次透射人工边界条件,提出了一种水平成层场地地震反应非线性分析的显式有限元方法,并据此编制了计算机程序。数值实验表明,这种方法能较好地模拟土层在强地震作用下的非线性特性。更多还原

【Abstract】 Based on the explicit iterative formula presented by Li Xiaojun, an incremental-iterative scheme is put forward to discretize the dynamic equation. Combining the dynamic nonlinear constitutive model of soil presented by Pyke and the multi-transmitting artificial boundary condition, a new approach is proposed to predict the nonlinear seismic response of horizontal layered soil site and a computer program is worked out with the help of the same ideas. As demonstrated by numerical examples, this approach can significantly improve the simulation of the nonlinear characteristics of soil site under strong ground motions.更多还原