柔性弹簧与刚性弹簧在DDA方法中的应用

块体系统不连续变形分析（DDA方法）是在假定的位移模式条件下，由位移变分法建立总体平衡方程式，通过施加或去掉块体界面则硬弹簧，满足块体间不开裂不嵌入的位移边界条件。本文此基础上，引入了柔性弹簧，讨论了柔性弹簧和刚性弹簧共同作用，使块体间的接触更真实或更符合物理特性。本文最后给出不同粘接力砌体梁的应力，应变情况和破坏过程，并与有限元结果进行比较，讨论了其合理性。

The Application of Flexible Spring and Rigid Spring in DDA Method

this paper discusses a new numerical methkd-Discontinuous deformation analysis(DDA),mhich was dased on the assumed displacement model. The equilidrium was set up based on displacement variations tO satisfy no seperating and embeding displacement boundary conditions of blocks, interface.in this paper, the flexible spring was introduced and the interation of rigid spring and flexible spring was studied to make the contact of blocks more reasonable andpracticalFinally, the stress, strain and breaking of a brick beam were given to compare with thethose obtained by FEM.