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本文对钢筋混凝土箱梁的非线性结构性能从理论和试验两个方面进行了研究.首先阐明了用分层退化壳单元、材料非线性本构关系以及逐渐释放应力的混凝土裂缝张拉刚度模型,来模拟分析钢筋混凝土箱梁从开始受载、开裂、屈服、直至破坏的全过程分析方法.然后对三个钢筋混凝土箱梁模型在竖向偏心荷载作用下从弹性状态过渡到弹塑性状态、直至到达破坏状态的全过程进行了理论分析与试验研究,并将两者结果进行了比较.
In this paper, the nonlinear structural performance of reinforced concrete box girders is studied from two aspects of theory and experiment. Firstly, the tensile stiffness model of concrete cracks with layered degenerate shell elements, nonlinear material constitutive relations, and gradually releasing stress is illustrated. Simulate and analyze the whole process analysis method of reinforced concrete box girders from the beginning of loading, cracking, yielding, to failure. Then three reinforced concrete box girder models under the effect of vertical eccentric load from the elastic state to the elastoplastic state, until The theoretical analysis and experimental study were carried out in the whole process of reaching the destructive state, and the results were compared.