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V形刚构-拱组合桥体系复杂,为了能更准确地认识和把握这种新型桥梁的力学性能,以小榄特大桥工程为例,建立精确的三维有限元模型,其中V形墩、梁、拱采用三维8节点实体单元,支撑采用空间梁单元和桁架单元,吊杆采用空间索单元进行离散。应用大型通用有限元软件ANSYS对其成桥阶段的主要工况进行弹性计算,同时也对该类桥型有可能出现的病害情况进行预测和模拟。据此,对比分析了各种情况下关键部位和构件的变形及受力状态。研究结果表明:该桥整体受力以V形连续刚构为主,拱对主梁起加劲作用;预应力对结构的安全性至关重要;该桥在一定数量内吊杆断裂的情况下,主体结构具有很好的内力重分配能力;拱脚处受力复杂,要采取构造措施防止局部破坏。
V-shaped rigid-arched composite bridge system is complex. In order to recognize and grasp the mechanical properties of this new type of bridge more accurately, an accurate three-dimensional finite element model is established with the project of Xiaolan Extra Large Bridge, in which the V- , The arch uses a three-dimensional 8-node solid unit, the support uses the space beam unit and the truss unit, and the suspension bar adopts the space cable unit to disperse. The large-scale finite element software ANSYS is used to calculate the main conditions of the bridge during its completion stage. At the same time, the prediction and simulation of the possible disease situations of such bridges are also carried out. Based on this, the deformation and stress state of the key parts and components under various conditions are comparatively analyzed. The results show that the overall force of the bridge is dominated by V-shaped continuous rigid frame and the arch is stiffening the main girder. The prestressing is crucial to the structural safety. Under a certain amount of broken boom, The main structure has a good ability to redistribute the internal force; arch foot force at the complex, to take structural measures to prevent local damage.