更高速度条件下铁路简支箱梁关键参数研究

针对梁体基频、竖向刚度等参数,概述我国高速铁路桥梁参数的研究思路及成果、参数设计及运营现状,采用车桥竖向相互作用程序分析铁路简支箱梁动力响应规律。结果表明,梁体基频为设计参数的控制因素,梁体实测梁体基频高于设计值和规范限值,梁体刚度存在一定的储备;时速350 km的高速铁路简支箱梁可适应更高速度420 km/h的运营要求;420 km/h速度等级高速铁路简支箱梁关键参数可参考350 km/h速度等级相关参数;40 m跨度车桥动力响应明显降低,梁体基频等动力参数不再控制梁体设计,建议开展高速铁路更大跨度简支箱梁应用研究。

Research on Key Parameters of Simply Supported Box Beam on Higher Speed Railway

With respect to beam parameter such as natural frequency and vertical stiffness,the article describes research methods and results,design parameters and operation status of China high speed railway bridge,analyzes dynamic response relationship of railway simply supported box beam with trains and bridge vertical interrelationship. Results show that the natural frequency is the key factor for design parameter,the measured beam natural frequency is larger than design value and code limit,which means the beam stiffness is sufficient; the box beam on high speed railway at design speed of 350 km / h meets the operation requirements at speed up to 420 km / h; key parameter of box beam on high speed railway at design speed of 420 km / h may refer to that at design speed 350 km / h; the dynamic response of 40 m box beam is obviously lower,which means the beam natural frequency is no longer as a control parameter in beam designing. The article recommends application research on longer simply supported box beam on high speed railway.