【摘要】：為了研究寬幅流線型箱梁斷面的渦振性能,以某跨越長江的大跨懸索橋為背景,進行1∶50節(jié)段模型風洞試驗。分析了檢修軌道、人行道欄桿等渦振敏感構件的影響,研究了改變?nèi)诵械罊跅U形式、附加斜腹板導流板以及風嘴分流板等氣動措施的制振效果。研究結果表明,寬幅箱梁渦振性能隨來流攻角增大而逐漸變差,且由于漩渦Strouhal數(shù)的變化易誘發(fā)多區(qū)間渦振,扭轉渦振幅值隨阻尼增加線性衰減顯著。人行道欄桿是此類斷面的渦振敏感構件,去掉欄桿踢腳石能明顯改善渦振性能;斜腹板導流板對改善其渦振性能效果微弱;風嘴分流板具有顯著的制振效果,不僅能有效地抑制主梁渦振的發(fā)生,且能提高顫振臨界風速。
[Abstract]:In order to study the vortex-vibration behavior of a wide streamlined box girder section, a 1:50 section model wind tunnel test was carried out on a long-span suspension bridge across the Yangtze River. The effect of vortex vibration sensing components such as overhauling track and sidewalk railing is analyzed. The effect of aerodynamic measures such as changing the form of sidewalk railing adding inclined web plate diversion plate and wind nozzle shunt plate is studied. The results show that the vortex vibration performance of wide box girder becomes worse with the increase of the angle of attack, and the amplitude of torsional vortex decreases linearly with the increase of damping due to the variation of swirl Strouhal number. The sidewalk railings are the vortex vibration sensitive components of this kind of section. Removing the railings kick stone can obviously improve the vortex vibration performance, the inclined web diversion plate has a weak effect on improving the vortex vibration performance, and the wind nozzle shunt plate has remarkable vibration control effect. Not only can the vortex vibration of the main beam be effectively suppressed, but also the critical flutter velocity can be increased.
【作者單位】： 貴州橋梁建設集團有限責任公司;長沙理工大學土木與建筑學院;湖南大學風工程試驗研究中心;
【基金】：國家重點基礎研究規(guī)劃(973計劃)項目(2015CB057706) 國家自然科學基金資助項目(51208067,51278069,51478049) 湖南省重點學科創(chuàng)新項目(2013ZDXKC5)
【分類號】：U441.3
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本文編號：2195017