基础激励下桥梁斜拉索的非线性振动
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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.
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.
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.
引文
1康厚军,赵跃宇,王连华.斜拉桥中拉索对桥面动力特性的影响.动力学与控制学报,2007,5(1):44～46(Kang HJ,Zhao Y Y,Wang L H.Theoretical considera-tions for effects of cables on deck of cable-stayed bridges.Journal ofDynamics and Control,2007,5(1):44～46(inChinese))
2曾德子,赵章力,卿迟.深圳湾公路大桥(深圳侧通航孔桥)索塔施工.广东交通职业技术学院学报,2007,6(3):23(Zeng D Z,Zhao Z l,Qin C.Cable and towerconstruction for Shenzhen bay bridge(Shenzhen side navi-gation Bridge).Journal ofGuangdong Transportation Voca-tional and Technical College,2007,6(3):23(in Chi-nese))
3梅葵花,吕志涛,孙胜江.CFRP拉索的非线性参数振动特性.中国公路学报,2007,20(1):52～56(Mei KH,Lv Z T,Sui S J.Property of nonlinear parametric vibra-tion of CFRP cables.China Journal ofHighwayand Trans-port,2007,20(1):52～56(in Chinese))
4 Olivier F.Rain-wind induced vibrations of cables.JournalofEngineering and Industrial Aerodynamics,1995(57):353～362
5 SIAI-Noury,Ali S A.Large-amplitude vibration of parabol-ic cable.Journal ofSound and Vibration,1985,101(4):451～462
2曾德子,赵章力,卿迟.深圳湾公路大桥(深圳侧通航孔桥)索塔施工.广东交通职业技术学院学报,2007,6(3):23(Zeng D Z,Zhao Z l,Qin C.Cable and towerconstruction for Shenzhen bay bridge(Shenzhen side navi-gation Bridge).Journal ofGuangdong Transportation Voca-tional and Technical College,2007,6(3):23(in Chi-nese))
3梅葵花,吕志涛,孙胜江.CFRP拉索的非线性参数振动特性.中国公路学报,2007,20(1):52～56(Mei KH,Lv Z T,Sui S J.Property of nonlinear parametric vibra-tion of CFRP cables.China Journal ofHighwayand Trans-port,2007,20(1):52～56(in Chinese))
4 Olivier F.Rain-wind induced vibrations of cables.JournalofEngineering and Industrial Aerodynamics,1995(57):353～362
5 SIAI-Noury,Ali S A.Large-amplitude vibration of parabol-ic cable.Journal ofSound and Vibration,1985,101(4):451～462
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