大跨度橋梁空氣靜力失穩(wěn)機理研究.pdf

大跨度橋梁空氣靜力失穩(wěn)機理研究

　在綜合考慮結(jié)構(gòu)幾何非線性和靜風(fēng)荷載非線性的基礎(chǔ)上提出一種大跨徑橋梁空氣靜力穩(wěn)定性的計算方
法, 并編制了相應(yīng)的計算軟件BNAP。
然后分別對汕頭海灣二橋(斜拉橋) 和虎門大橋(懸索橋) 的空氣靜力穩(wěn)
定性進行了計算。
從計算結(jié)果中主梁跨中點處位移隨風(fēng)速的變化圖入手, 選取幾個關(guān)鍵點, 結(jié)合這幾個關(guān)鍵點
處結(jié)構(gòu)的變形情況和對應(yīng)的三分力系數(shù)變化情況, 詳細探討了結(jié)構(gòu)空氣靜力失穩(wěn)機理。

After considering geometric nonlinearity and nonlinear static wind loads based on the air for long span bridge is proposed static stability is calculated by
 Method, and corresponding calculation software BNAP. Shantou Bay Bridge and then separately (bridge) and the Humen Bridge (suspension) of the static stability of air
 Qualitatively calculated. The results from the cross-girders in the mid-point change in the displacement map wind speed start, select a few key points, with these key points
 Deformation of structure and the corresponding aerodynamic coefficients changes, the structure is discussed in detail aerostatic instability mechanism.