长山跨海矮塔斜拉桥成桥工作性状三维数值分析

3D Numerical Analysis of Working Performance of Long Span Extradosed Cable-stayed Bridge

长山大桥是目前国内最大跨径的预应力混凝土矮塔斜拉桥,为更为准确分析其成桥状态下工作性状,通过建立全桥三维精细化有限元数值模型,合理考虑预应力钢筋和索力作用影响,针对自重、二期恒载、预应力荷载以及车道荷载作用下结构体系受力变形特性进行了三维数值分析,得到一些有意义的结论,可为相关工程实践提供参考。计算结果表明,在大型数值分析过程中需对预应力钢筋进行精细化考虑,以真实反映索力与预应力共同作用下的复杂工作受力变形状态。

Changshan Bridge is the largest extradosed cable-stayed bridge in China, in order to analyze the working performance of bridge in completion state, a refined 3D numerical model is established to investigate the deformations and internal forces of bridge structure system subjected to gravity, secondary dead load, pre-stressing load and lane load by reasonably considering the effects of pre-stressed rebar and bridge cable. Some significant conclusions are drawn which can provide reference for engineering practice. Numerical results show that it is necessary to model rebar and bridge cable to a refined extent to describe the complicated working performance of bridge structure in three dimensional numerical computation.