32m高速铁路简支箱梁模型非线性有限元分析

以高速铁路预应力混凝土简支梁为研究对象,采用纤维模型和平面有限元模型分析方法进行重复荷载下简支梁模型的非线性有限元分析,详细介绍了数值模型建立中的关键问题并给出了合理取值,同时对静力非线性和频率衰减规律进行了初步探讨.结果表明:纤维模型和平面有限元分析方法分析得到的预应力混凝土箱梁模型的荷载位移骨架曲线与试验测试结果吻合较好,纤维模型可以较好地模拟加卸载规律,平面有限元方法可以进行静力非线性和损伤衰减规律的分析,两种方法结合可以较好地预测高速铁路预应力混凝土箱梁整个加载历史的非线性响应.

Nonlinear Finite Element Analysis of the Model of the 32 m High-speed Railway Simple Box Girder

The high-speed railway prestressed concrete beam was chosen as the research object, the numerical nonlinear finite element analysis method under repeated loading was established detailedly using the fiber model and plane finite element model, and the key issues was discussed and the reasonable value was recommended. At the same time the relationship of static nonlinear and frequency attenuation rule was preliminary analyzed. The results showed that the load-displacement skeleton curves of the fiber model and plane finite element analysis method on prestressed concrete box girder were in good agreement with those obtained in the experiment. The fiber model could well simulate the load and unloading rules, and plane finite element method could reflect the static nonlinear and damage attenuation law. The combining of two methods could better predict the nonlinear response in the whole loading history of the high speed railway prestressed concrete box girder.