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针对大跨径桁架悬索桥全桥气弹模型风洞试验中,加劲梁外形复杂模拟难度大这一问题,提出了一种新的模型设计方法。首先,通过多种建模方法建立有限元模型,进行动力特性比较。采用单脊梁骨架模型方法模拟桁架加劲梁刚度,合理简化桁架加劲梁外形,近似模拟桁架气动力。分析桥塔、主缆、吊杆等模型设计中的各种影响因素。最后对模型进行动力特性试验验证,试验结果与理论分析接近一致。
In the wind tunnel test of full-span aeroelastic model of long-span truss suspension bridge, the difficulty in simulating the shape of the stiffening girder is difficult, and a new model design method is proposed. First of all, through a variety of modeling methods to establish the finite element model for dynamic characteristics comparison. The stiffness of truss stiffening girder is modeled by a single-spine truss model to simplify the truss girder shape and simulate the truss aerodynamic force. Analysis of the bridge tower, the main cable, boom and other model design of the various factors. Finally, the dynamic characteristics of the model test validation, test results and theoretical analysis of the same.