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.
出处
《科学技术与工程》
北大核心
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
关键词
斜拉桥
预拱度
动力响应
舒适性
cable-stay bridge pre-camber dynamic response comfort
