摘要
本文提出三单元式模型,讨论了荷载转移法的收敛性。对于几乎不能承受拉应力的材料,若发生单纯的拉伸破坏,该方法是无条件收敛的。然而一般地讲,对于静力问题,荷载转移法的收敛取决于加荷等级和计算精度。对于动力问题,取决于时间步长△t和计算精度;只要△t取得足够小,收敛就相当迅速。当分析软—硬—软状态时,本文修正了荷载转移法,以加快敛速度。最后,文中还给出了用荷载转移法作土—结构相互作用非线性分析时土单元和节理单元的不平衡应力张量表达式。
In this paper a model of three elements is proposed for discussing the convergency of the load transfer method. With the helf of this midel it was shown that the method is un-conditionatiy convergcnt for no tension material, upon which only tensional forces act. In general, however, the convergency depends on the load increments for static analysis, and on the time step Δt for dynamic analysis. It will converge rapidly , provided that Δt is small enough. The conclusions were confirmed by analyzing a soil-structure interaction system.
出处
《工程力学》
EI
CSCD
1989年第4期88-96,共9页
Engineering Mechanics
