曲线部分斜拉桥边中跨比及主梁适宜刚度研究  

Research of Ratio of Side Span to Central Span and Suitable Stiffness of Main Beam of Curved Extradosed Cable-stayed Bridge

作　　者：董水英[1] 杨飞[1] 杨昀[1] 

机构地区：[1]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2012年第10期71-77,共7页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通建设科技项目(2009318223058)

摘　　要：采用弯梁桥与直梁桥的边中跨比的类比方法,根据已建直线部分斜拉桥的边中跨比,类比出曲线部分斜拉桥合理的边中跨比,其适用的边中跨比范围在0.5～0.6左右。通过对我国已建部分斜拉桥相关参数的统计并与日本规范进行对比,对曲线部分斜拉桥适宜的主梁高度进行了分析,得到了变截面梁曲线部分斜拉桥适宜的梁高取值范围。通过调查,对变截面曲线部分斜拉桥合理的梁底曲线进行了分析,建议曲线部分斜拉桥跨径小于200 m时采用2次抛物线,大于200 m时采用1.8次曲线。According to the ratio of side span to central span of the existing straight extradosed cable-stayed bridge, the ratio of side span to central span of curved extradosed cable-stayed bridge （CECB） was generalized by using the analog method about the ratios of side span to central span of curved girder bridge and straight one. The applicable ratio of side span to central span of CECB is in the range of 0. 5 to O. 6. Though comparing the statistical parameters related to the existing extradosed cable-stayed bridges in China with those in Japanese specification, the appropriate height of main beam of CECB was analyzed to obtain the suitable range of beam height about CECB with variable cross-section beam. Through investigation, the rational beam bottom curve of CECB with variable cross-section beam was analyzed. It is recommended that to adopt quadratic parabola when the main span is less than 200 m, and to adopt curve index of 1.8 when the main span is greater than 200 m.

关 键 词：桥梁工程 曲线部分斜拉桥 边中跨比 主梁适宜刚度 主梁高度 梁底曲线指数 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]