Experimental Study on Wind Resistance Performance of Semi-closed Box Girder of Long-span Self-anchored Suspension Bridge
Based on a proposed long-span self-anchored suspension bridge,the wind-resistant performance of semi-enclosed steel-UHPC composite stiffening girder is studied by ANSYS finite element analysis and wind tunnel test of segmental model.The results show that the flutter critical wind speed of the semi-closed box steel-UHPC composite stiffening girder is significantly higher than the flutter test wind speed at-3°,0° and 3° wind attack angles.The flutter stability meets the requirements of the specification and the safety reserve is large.The vertical vortex-induced resonance of the stiffening girder exceeds the allowable amplitude of the specification at the wind attack angles of 5°,3° and-3°,and the torsional vortex-induced resonance exceeds the allowable amplitude of the specification at the wind attack angle of 3°.After the aerodynamic shape improvement of the original stiffening beam,the vertical vortex-induced resonance and the torsional vortex-induced resonance disappear,and the flutter stability is also significantly improved.
self-anchored suspension bridgesteel-UHPC composite beamsegmental model teststiffening girderwind-resistant performance
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