一、概述在结构动力分析中,广泛采用直接积分法求解时域内的运动方程。主要的方法分两类。第一类为显式方法。即将加速度和速度用连续的位移值表示,在运动方程中,加速度和速度被每一时间步长内所要求出的位移矢量所代替。这类方法的主要区别在于有各种不同的假定,它们的—个主要缺陷就是它们是条件稳定的。事实上可以说明所选时间步长增量必须远 I. Overview In the structural dynamic analysis, direct integration method is widely used to solve the equation of motion in the time domain. The main method is divided into two categories. The first is an explicit method. The acceleration and velocity are expressed in terms of successive displacements in which the acceleration and velocity are replaced by the displacement vectors required for each time step. The main difference between these approaches is that there are different assumptions, one of their main drawbacks being that they are conditionally stable. In fact it can be shown that the increment of the selected time step must be far