可离散有限元法模拟混凝土构件破坏过程

利用Munjiza的可离散有限元法(FE/DEM)二维Y2D程序,对混凝土梁中点和混凝土短柱受轴向冲击进行数值模拟;并考察程序的局限性。结果表明:混凝土梁的开裂位置与ANSYS软件预测的高应力区吻合,混凝土短柱裂纹的产生、发展、破裂和破碎各阶段的形态合理,Y2D程序能够预测连续固体向非连续体转变的全过程;程序存在无法施加集中力载荷以及位移载荷等局限性,不适于应用性计算,需要完善及改进。

FE-DEM simulation of failure process of concrete specimens

With Munjiza's 2-d code Y2D based on the so-called combined finite-discrete element method(FE/DE),two examples,i.e.rupturing of a concrete beam under transverse impact and fracturing of a concrete column under axial impact,were simulated.It illustrated that,the cracking pattern in the former example is coincided with the high stress bands in the contour chart predicted by ANSYS,and the patterns of cracking,crack propagation,fracturing and multi-fracturing of the column in the later example were in general r...