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高速铁路中承式连续梁拱组合桥拱梁固接区域结构的构造和受力复杂,依托该类型某高速铁路桥梁工程实际,以拱梁固接区域为研究对象,以1∶4缩尺模型试验和空间有限元仿真分析相结合的方法,研究结构的传力路径和应力分布规律。简要介绍了模型缩尺原则、加载体系确定和应力测点布置。试验与仿真分析结果表明:横梁会导致主拱肋发生面外弯曲,使有横梁一侧主拱肋腹板、内填混凝土应力大于无横梁一侧,并且在横梁与主拱肋连接位置出现应力集中;主拱肋与主纵梁连接位置也有应力集中。但是,固接区域结构总体应力水平较低,整体表现为弹性工作状态;结构传力路径明确,应力分布合理,满足承载能力要求。
Based on the actual project of a high-speed railway bridge of this type, taking the fixed area of arch-beam as the research object and the 1: 4 scale model Test and spatial finite element simulation analysis of the combination of methods to study the structure of the force path and stress distribution. A brief introduction to the principle of model scale, loading system and stress measuring point arrangement are given. The results of the test and simulation show that the beam will lead to the out-of-plane bending of the main arch rib so that the main arch rib web on one side of the beam and the stress of the filled concrete are larger than the beam-free side and stress occurs at the connection position between the beam and the main arch rib Focus; the main arch ribs and the main beam connection location also has stress concentration. However, the overall stress level of the fixed area structure is lower, and the overall performance of the structure is elastic. The path of force transmission is clear, the stress distribution is reasonable, and the bearing capacity requirements are met.