Buffeting Time-domain Analysis Of Long-span And Slender Suspension Bridge With A Steel Truss Stiffened Girder

Because the narrow bridge floor's greatly cross hanging bridge its construction cost is inexpensive, the construction convenience the mountainous area existence are many west our country, its superstructure rigidity is small, the windward sensitivity is strong, although may through certain wind resistant measure guarantee that it will not have the divergent power destruction, but the buffeting will be actually inevitable, but the existing greatly cross truss bridge's buffeting analysis will be based on the large-scale highway bridge, will add the wind resistant measure regarding this kind of narrow bridge floor the bridge to carry on the analysis to draw the useful conclusion alone.This article take main span 278m, the bridge floor extends 4m the steel truss stiffening girder hanging bridge - Xinjiang Saiwudiegeer bridge as the project background, has carried on the finite element simulation simulation analysis to this kind of bridge's elegance buffeting response, and has carried on the analysis to several essential influencing factors. The prime task content includes:1,Improved use of the harmonic synthesis, along with a high degree of change Simiu spectrum and Lumley-Panofsky spectrum as the goal of Xinjiang Bridge full-bridge winds were simulated, generating a bridge structure of discrete points of vertical and horizontal wind pulse of time.2,Carried on the simulation using the Davenport buffeting strength model and the promoted Scanlan autoexcitation strength expression to the buffeting strength and the air operated autoexcitation strength, and the overall evaluation structure's geometry misalignment, the host cable bridge tower wind load, the effective wind angle of attack's influence, has obtained the bridge structure buffeting response result.3,Carried on the contrastive analysis to the above factor's influence, has drawn several conclusions: For this type of suspension bridge, the structure big texturing effect to the buffeting response influence for negative, the computation power response may conservative not consider that the structure the big distortion, may save the massive calculation time like this; In the computation various factors are various to the king post various directions buffeting response's influence, therefore in the computation simplifies should the differential treatment; To this type hanging bridge, the buffeting is quite big to lateral shear's influence, should the key consideration.