摘要
以鄂东长江公路大桥为依托,充分考虑非线性效应,基于几何控制法,研究拉索无应力长度误差对超大跨度混合梁斜拉桥成桥线形及内力的影响,发掘千米级混合梁斜拉桥边中跨结构力学行为特点及控制手段。计算分析揭示了超大跨度混合梁斜拉桥边中跨结构的差异,致使无应力索长误差对中跨成桥线形影响远大于边跨,对边跨成桥内力的影响则大于中跨部分,边中跨结构在受力上具有相对独立性;全桥应力变化百分比最大处位于钢-混结合段,该区域受力复杂,需引起施工及设计的高度重视;梁体刚度的差异,对成桥索力重分配产生重要影响,边中跨索力变化呈现不同特征。
Taking Edong Yangtse River Bridge as the research subject, the influence of error of unstressed cable length on geometry shape and internal force of super-span hybrid girder cable-stayed bridge during completion is studied based on the geometry control method with fully consideration of the effect of geometric nonlinearity. Also, the mechanical behavior of central span and side span of hybrid girder cable-stayed bridge with thousand-meter scale span length and the control strategy are discussed. The analysis shows that （1） The structural differences of central and side spans of super-span hybrid girder cable-stayed bridge exerted an influence on the geometry shape and the internal force. The influence of unstressed cable length error on the geometry shape in central span of completed bridge is greater than that of side span, while the impact on internal force in side span is greater than that in central span. The mechanical behavior is relatively independent between central span and side span. （2） The percentage change of the girder stress reaches to maximum in the steel-concrete composite structures, in which the mechanic behavior is very complicate, and its design and construction should be paid more attention to. （ 3） The difference of rigidity between central span and side span has remarkable impact on the cable force redistribution in completion state, and the changes of cable force at central span and side span are different.
出处
《公路交通科技》
CAS
CSCD
北大核心
2013年第8期96-101,共6页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51178394)
西南交通大学"百人计划"项目(2682013BR015EM)
关键词
桥梁工程
混合梁斜拉桥
几何控制法
无应力索长误差
超大跨度
bridge engineering
hybrid girder cable-stayed bridge
geometry control method
unstressedcable length error
super long-span
