中文摘要：

为了准确模拟预应力混凝土箱梁在荷载作用下的极限承载能力及其开裂状态,采用非线性有限元方法对其进行塑性损伤模拟分析,并将模拟结果与试验数据进行对比验证.混凝土箱梁塑性损伤分析结果表明：将损伤因子引入预应力混凝土箱梁的非线性分析方法可行,且能准确地获取结构抗弯抗剪性能及破坏特征;单调荷载作用下损伤因子对结构极限承载能力有较大的影响;混凝土箱梁的塑性损伤分析应选用合适的损伤因子计算方法.

英文摘要：

In order to accurately simulate the ultimate bearing capacity and crack state of prestressed concrete box girder under load, the plastic damage of the box girder is analysed by using nonlinear finite element method, and the simulation result is compared with the experimental data. The analysis result of plastic damage of concrete box girder shows that （1） it is feasible to introduce the damage factor into the nonlinear analysis of prestressed concrete box girder, and it can obtain the structural＇s bending shear resistance and failure characteristics accurately; （ 2 ） damage factor has great influence on the structural ultimate bearing capacity under monotonic loading; （ 3 ） analysing plastic damage of concrete box girder should choose appropriate calculation method of damage factor .