空心型箱形铁路框架桥的力学性能分析

为获得空心型截面铁路框架桥的承载性能,以某铁路框架桥实际工程为背景,将桥顶板和侧板分别沿纵向和横向挖孔,分析顶板沿顺桥向挖孔的理论依据。采用有限元软件ANSYS建立该结构与土体共同作用的模型,分析研究桥体位移沉降、主拉应力和基底附加应力的规律,并与原型框架桥进行比较,研究结果显示该框架桥提高了自身承载力,减小了其变形,从而验证了该框架桥的可行性,为此种结构的应用与推广提供了理论依据。

Analysis of Mechanical Behavior of Hollow Box Railway Frame Bridges

To acquire the bearing capacity of hollow box railway frame bridges,an actual railway frame bridge of such type was cited as an example,the holes were opened in the top slab and lateral slabs of the bridge respectively in the longitudinal and transverse directions and the theoretic bases of the hole opening in the longitudinal direction were analyzed.The finite element software ANSYS was used to set up the model for interaction between the structure and soil.The laws of displacement,settlement,principal tensile stress and base additional stress of the bridge were analyzed and were compared to those of the prototype frame bridge.The results of the analysis show that the bearing capacity of the bridge has been improved and the deformation of the bridge has been reduced.The feasibility of the hollow box frame bridges is therefore verified and the theoretic bases for application and popularization of the bridges are provided.