有限弹簧法在钢筋混凝土细观断裂分析中的应用

叙述了依据计算几何学的分割理论划分多边形单元的计算前处理系统，及其有限弹簧法在钢筋混凝土构件细观断裂数值模拟中的应用。该模拟系统的主要特色为：一是利用有限弹簧法的单元形状任意性来考虑混凝土断裂模拟时单元形状的影响；二是利用其变位不连续性模拟构件从微细裂缝到断裂的全过程；三是把钢筋和混凝土分别看成具有不同性质的微小构造单元来考虑其界面性质。数值模拟钢筋混凝土构件在拉伸作用下的断裂全过程，考察钢筋的螺纹抵抗作用及其保护层的约束机理。

Application of finite spring model in mesoscopic fracture simulation of reinforced concrete

A finite spring model is used to simulate the mesoscopic failure processes in the reinforced concrete. The reinforced concrete prisms with square cross section are analyzed using two|dimensional analytical models. The specimen is divided into small elements using the concept of Voronoi polygons, and the elements are assumed to be the rigid bodies connected by the normal and tangential springs. Special attention is given to modeling the lug geometry on reinforcing bars and the direct interaction at the steel|concrete interface, that the mesoscopic behavior in the vicinity of a deformed bar can be well simulated.