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基于ANSYS的桥梁全模态颤振频域分析方法

, PP. 41-47

Keywords: 桥梁工程,全模态颤振,有限元方法,频域分析

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Abstract:

?提出了一种在ANSYS中直接分析大跨桥梁三维全模态颤振的有限元模型和频域方法。该有限元模型采用ANSYS的自定义单元Matrix27来模拟桥面受到的自激气动力,而将单元Matrix27的刚度或阻尼矩阵描述成风速和振动频率的函数。通过阻尼特征值分析,确定风-桥耦合系统的各复特征值,其中复特征值的实部为阻尼而其虚部则为振动频率;并给出了求解系统各阶复模态特性随风速变化的迭代算法。最后以一简支梁桥和一悬索桥算例验证了颤振分析模型和方法的正确性和可靠性。该方法能使桥梁设计人员和研究人员可以直接利用ANSYS来分析大跨桥梁的耦合颤振。

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