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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 span prestressed concrete cable-stayed bridge with the largest span in China. In order to analyze the working characteristics of the bridge more accurately, by establishing a three-dimensional finite element numerical model of the full bridge and considering prestressed reinforcement and Three-dimensional numerical analysis of the mechanical deformation of the structural system under self-weight, second-stage dead load, prestressed load and lane load results obtained some meaningful conclusions, which can provide reference for relevant engineering practice. The results show that in the process of large-scale numerical analysis, the prestressing tendons should be carefully considered, so as to truly reflect the complex deformation and stress state under the combined action of cable force and prestress.