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以在建特大型桥(132+230+132m)为工程背景,首先对桥梁的粱体和墩部进行了合理的简化,应用有限元软件ANSYS,采用壳单元模拟桥身,二维梁单元模拟桥墩,杆单元模拟预应力筋的方法建模,建立分析模型。其次计算其自振特性,得到桥梁的振动频率和主振型,分析桥梁参数的改变对其自振特性产生的影响。从而提出,在特大型桥的结构设计中可以通过优化模态参数,避开危险频率带,减小对桥梁结构的破坏性。
Taking the large bridge (132 + 230 + 132m) as the engineering background, the beam body and the pier of the bridge are reasonably simplified. The finite element software ANSYS is used to simulate the bridge body and two-dimensional beam element of the bridge Bridge piers and bars to simulate the method of prestressing tendons to establish the analytical model. Secondly, the natural vibration characteristics of the bridge are calculated, the vibration frequency and the main vibration mode of the bridge are obtained, and the influence of the change of the bridge parameters on the natural vibration characteristics is analyzed. It is proposed that in the structural design of extra-large bridge, the modal parameters can be optimized to avoid the dangerous frequency band and reduce the destructiveness of the bridge structure.