摘要
三线铁路弯梁桥具有桥面宽、结构宽跨比大、部分截面扭矩大、受力复杂的特点,且目前国内铁路桥梁上可供借鉴的设计、研究经验较少。文章以北京动车段工程跨京开高速公路特大桥三线铁路预应力混凝土连续弯梁为研究对象,通过有限元程序,分别建立了该桥的直梁和弯梁单元模型,在对两组模型各项内力对比分析以及借鉴公路桥梁设计成果的基础上,得出了该桥可以采用直梁模型进行结构总体受力分析的结论,进而简化了该三线连续弯梁桥的结构计算方式,降低了设计难度、提高了设计效率,同时也可为同类桥梁的设计与计算提供参考。
Three-line railway curved beam bridge is featured by wide deck,big ratio of structural width and span,large torques of some cross sections and complex stress,and currently there are few designs and research experience of railway bridges in China for reference. Taken the three-line railway prestressed concrete continuous curved beam of super major bridge across the Jing-Kai high-speed railway in Beijing EMU Depot as the research object,through the finite element program,element models of straight beam and curved beam are established separately. On the basis of the comparision and analysis of the internal forces for the two models and the highway bridge design achievements for reference,it is concluded that the straight beam model can be adopted for the overall structural stress analysis,and then,the structure calculation way of the three-line continuous curved beam bridge is simplified,the difficulty of the design is reduced,the design efficiency is improved,and also references for similar bridge design and calculation are provided.
出处
《高速铁路技术》
2016年第3期19-22,共4页
High Speed Railway Technology
关键词
三线铁路
弯梁
直梁
简化计算
有限元
three-line railway
curved beam
straight beam
simplified calculation
finite element
