【摘要】 在考虑拉索垂度的情况下建立了深圳湾公路大桥的动力学模型,利用有限元软件模拟了地震、风、车辆等荷载作用于桥梁结构时桥面及桥塔索锚固点的位移响应,以及全桥整体动力特性和索连接点的振动解,从而真实反映出基础激励对索的初始扰动,进而研究索在最不利荷载作用情况下谐波共振和参数振动的特性,并在此基础上分析了激励频率与拉索固有频率比的匹配关系,得出了激励幅值、初始索力、模态阻尼比、拉索倾角等参数对拉索非线性振动的影响.更多还原

【Abstract】 A mechanical model of Shenzhen Bay Bridge was established,which considered the hanging degree of cable,and the finite element software was used to simulate the displacement response of the bridge deck and tower anchor points when the seismic,wind,vehicles and other loads were acted on the bridge structure,and the dynamic characteristics of the bridge as well as the vibration solution of the connection nodal.The initial disturbance of cable under foundation excitation was revealed,and the harmonic resonance and parametric vibration of cable in the most unfavorable load case were studied.On this basis,the matching ratio of incentive frequency to cable natural frequency was analyzed,and the influencing characteristics of the nonlinear vibration for cable was obtained,which included excitation amplitude,initial force,modal damping ratio and the cable angle.更多还原