既有高速铁路简支梁桥提速适应性研究与技术发展展望

Study on speed-up adaptability and prospects for technological development of simply supported beam bridge of existing high-speed railway

为了探析既有高速铁路简支梁桥提速运营的可行性,明确简支梁技术发展方向,总结了我国高速铁路简支梁桥的技术发展历程,通过荷载效应对比分析、仿真计算和现场试验,研究了既有设计车速350 km/h桥梁结构提速适应性评估方法及评估步骤.结果表明:实际条件下既有设计车速350 km/h高速铁路简支梁桥上运行400 km/h列车时竖向荷载效应不超过设计值,结构受力安全;既有设计车速350 km/h高速铁路简支梁桥仿真计算和现场试验得出的提速条件下运营性能指标均满足规范要求,既有简支梁桥能够适应车速400 km/h运营条件;提出的既有高速铁路简支梁桥提速适应性评估方法和技术发展重点,可为相关工程实践和科研规划制定提供参考.

To explore the feasibility of speed-up operation of existing high-speed railway simply supported beam bridge,and clarify the development direction of simply supported beam technology,the technical development process of high-speed railway simply supported beam bridge in China is summarized.Through comparative analysis of load effect,simulation calculation and field test,the evaluation method and steps of speed-up adaptability of existing 350 km/h high-speed railway simply supported beam bridge are studied.The results show that the vertical load effect does not exceed the design value when 400 km/h train runs on the existing 350 km/h high-speed railway simply supported beam bridge under actual conditions,and the structure is safe.The operation performance indexes of the existing simply supported beam bridge of 350 km/h high-speed railway under the condition of speed increase obtained by simulation calculation and field test meet the requirements of the specification,and the existing simply supported beam bridge can adapt to the operation condition of 400 km/h.The proposed speed-up adaptability evaluation method and technical development focus of the existing high-speed railway simply supported beam bridge can provide reference for relevant engineering practice and scientific research planning.