应用无单元法近似计算拱坝开裂

本文针对拱坝开裂分析的难题，结合拱坝的受力特点，利用无单元法便于追踪结构开裂的特点，提出了一种拱坝三维开裂分析的近似方法，该方法将拱坝沿拱向分段，各段内分别布置无单元法节点并单独计算开裂，将各段通过界面耦合成拱坝整体以形成整体平衡方程。在实例计算中，本文用有限元的计算结果估算出了拱冠坝段的侧向约束刚度，并对某拱坝的拱冠梁坝段进行了开裂追踪计算，估算出了该拱坝沿拱冠坝基面的破坏深度，结果表明，无单元法近似计算拱坝开裂方便而实用。

The application of element free method to approximate calculation of arch dam crack propagation

An approximate method for tackling the problem of arch dam fracture is presented. By this method the arch dam is divided into several sections in the arch dam direction. Nodes are distributed and the crack propagation is solely considered in each section. All sections are combined through interfaces to form the whole arch dam. In the example, the lateral constraint stiffness is estimated from the result obtained from FEM, then the crack propagation is simulated for the crest section of the arch dam and the failure length along the base of the dam is estimated. The result shows that element free method(EFM) is convenient and effective in simulation calculation of arch dam fracture.