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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。
In order to accurately simulate the ultimate bearing capacity and cracking state of prestressed concrete box girder under load, a nonlinear finite element method was used to simulate the plastic damage and the simulation results were contrasted with the experimental data. The plastic damage analysis results of concrete box girder show that it is feasible to introduce the damage factor into the nonlinear analysis method of prestressed concrete box girder, and can accurately obtain the anti-shear performance and failure characteristics of the structure; under monotonic load, Ability has a greater impact; plastic box girder plastic damage analysis should choose the appropriate damage factor calculation method.