基于动力特性的大跨度轨道斜拉桥静活载预拱度设置分析

针对大跨度轨道专用斜拉桥预拱度设置问题,兼顾结构功能及变形与乘坐舒适性,提出静活载预拱度系数取为-0.7。依据工程实例,进行桥梁自振特性及动力响应分析,得到基于动力响应的静活载预拱度设置方法。竣工荷载试验表明,静活载预拱度按静活载所产生挠度的0.7倍反向设置,桥梁结构满足要求。经数值模拟,轨道列车横向加速度小于0.6 m/s~2,竖向加速度小于1.0 m/s~2,总体舒适性及瞬时舒适性较高,验证了预拱度设置的合理性。

Analysis of Static and Live Load Pre-camber Setting for Long-span Railway Cable-stayed Bridge Based on the Dynamic Characteristics

For long-span railway cable-stay bridge pre-camber setting, considered structure deformation and ride comfort, static and live load pre-camber coefficient is -0.7. Based on an engineering example, the natural vibration characteristics and dynamic response were analysed. The static and live pre-camber setting method based on the dynamic response was got. Completion of load test shows that the static and live load pre-camber according to static live load deflection of the 0.7 times reverse Settings, bridge structures meet the requirements. The numerical simulation of the railway train lateral acceleration is less than 0.6 m/s2, vertical acceleration is less than 1.0 m/s2, overall comfort and instantaneous high comfort, verifying the rationality of the camber is set in advance. dynamic response comfort