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根据苏通大桥、杭州湾大桥和苏拉马都大桥风洞试验节段模型和气弹模型的脉冲激励信号,首先采用随机子空间方法识别了各模型零风速时系统状态矩阵,分析了各自的固有模态耦合特点,然后识别了苏通大桥节段模型在不同风速时系统状态矩阵,在此基础上分析了模态耦合随风速的变化规律,最后详细研究了结构模态耦合发生的条件及耦合特点。结果表明:桥梁风洞试验模型模态刚度耦合强度低于阻尼耦合强度;对称系统模态耦合强度低于非对称系统强度;节段模型刚性系统模态耦合强度低于气弹模型柔性系统强度;两模态若为同相位,则模态刚度和阻尼耦合元素为正值;实桥也具有类似特点。
According to the wind tunnel test segment model of Sutong Bridge, Hangzhou Bay Bridge and Suramadu Bridge and the pulse excitation signal of the aeroelastic model, the system state matrix of each model at zero wind speed is first identified by stochastic subspace method, Then, the system state matrix of Sutong Bridge segment model at different wind speeds is identified. Based on the analysis, the variation of modal coupling with wind speed is analyzed. Finally, the conditions of modal coupling coupling are studied in detail. Coupling features. The results show that the modal stiffness coupling strength of bridge wind tunnel test model is lower than that of damping coupling strength; the modal coupling strength of symmetrical system is lower than that of asymmetric system; the modal coupling strength of rigid model of segment model is lower than the strength of flexible system of aeroelastic model; If the two modalities are in phase, modal stiffness and damping coupling elements are positive values; real bridge also has similar characteristics.