【摘要】 在Newmark隐式积分方法的基础上,提出了提高计算效率的改进方法,并指出非线性动力分析中,处理初始静应力场应注意的问题。以某一隧道为例,计算了其在列车动力荷载作用下的反应,并与显式方法进行了比较。计算表明,改进的计算方法,较大地提高了隐式方法的计算效率,且采用无条件稳定的隐式积分方法计算所需要的时间大大小于显式积分方法所需要的时间。对于隧道等地下结构的动力反应分析,宜使用无条件的稳定的隐式时间积分方法求解。更多还原

【Abstract】 Based on Newmark step-by-step implicit integration method, an improved method is put forward to improve calculation efficiency, and some questions are pointed out to which attention should be paid when initial static stress field is dealt with in dynamic nonlinear analysis. The implicit integration and explicit integration methods are applied, respectively, to calculate the dynamic response of a tunnel due to train vibration. It is shown that the improved method raise remarkably the calculation efficiency of implicit integration method and the required time of using implicit integration method is much less than that of using explicit method. It is suitable to select step-by-step implicit integration method to solve the questions of dynamic response for tunnel and some underground structures.更多还原