反复荷载作用下箱梁的结构行为

Structural Behavior of Box Girders under Repeated Loads

利用材料本构关系,基于柔度法的非线性梁柱单元,推导了一个钢筋混凝土箱梁纤维模型的计算公式.基于反复荷载作用下箱梁的荷载挠度曲线,建立了箱梁的刚度折减模型.研究结果表明:纤维模型能很好地反应钢筋混凝土箱梁的非线性力学性能,箱梁的刚度折减量和荷载呈线性分布.

The appropriate constitutive equation was selected. The calculation formula of the fiber model was deduced based on flexibility-based nonlinear beam-column element. The stiffness degrade model was erected based on the load deformation curve under repeated loads. The results showed that fiber module could well describe the nonlinear behavior of box girders, the stiffness degeneration of box girders and loads assume linear distribution.