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  

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

作　　者：黎小刚[1] 周建庭[1] 杨俊[1] 肖阳剑 

机构地区：[1]重庆交通大学土木工程学院,重庆400074

出　　处：《科学技术与工程》2016年第6期222-227,共6页Science Technology and Engineering

基　　金：教育部博士学科点专项基金(20115522110001)资助

摘　　要：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。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 O. 7 times reverse settings, bridge structures meet the requirements. The numerical simulation of the railway train lateral acceleration is less than 0. 6 m/s^2, vertical acceleration is less than 1.0 m/ s^2 , overall comfort and instantaneous high comfort, verifying the rationality of the camber is set in advance dynamic response comfort.

关 键 词：斜拉桥 预拱度 动力响应 舒适性 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]