分离双钢箱梁涡激振动气动干扰试验研究

发布时间：2018-04-11 20:36

本文选题：分离双箱梁 + 涡激振动　；参考：《振动与冲击》2017年18期

【摘要】：间距和风攻角是分离双钢箱梁涡激振动干扰的主要影响因素。通过节段模型风洞试验研究了-5°~+5°之间8个不同风攻角下分离双钢箱梁在极小间距(D/B=0.025,D为双箱梁的净间距,B为单箱梁宽)、较小间距(D/B=0.1)、中等间距(D/B=0.4)和较大间距(D/B=3.0)时的涡振特性,并将结果与单钢箱梁的结果进行了对比。研究发现:在极小间距和中等间距时,气动干扰放大了上下游箱梁的涡激振动;在较小间距时,双箱梁的涡振特性与来流风攻角密切相关,随着风攻角的逐渐变小,气动干扰对上下游箱梁涡激振动的影响由抑制效应逐渐转变为放大效应;在较大间距时,上游箱梁对下游箱梁涡激振动存在一定的抑制效应,下游箱梁对上游箱梁涡激振动的影响可以忽略。
[Abstract]:Spacing and wind angle of attack are the main influencing factors for vortex vibration disturbance of double steel box girder.The results are compared with those of single steel box girder.It is found that aerodynamic interference amplifies the vortex-induced vibration of the upstream and downstream box-girders at minimal and medium spacing, and that the vortex-induced vibration characteristics of the double-box girders are closely related to the angle of attack of the incoming wind when the spacing is small, and decreases gradually with the wind attack angle.The effect of aerodynamic interference on the vortex-induced vibration of the upstream and downstream box girders gradually changed from suppression effect to amplification effect, and there was a certain inhibition effect on the vortex-induced vibration of the upstream box girder at large spacing.The effect of downstream box girder on the vortex-induced vibration of upstream box girder can be neglected.
【作者单位】：石家庄铁道大学大型结构健康诊断与控制研究所;河北省大型结构健康诊断与控制重点实验室;石家庄铁道大学土木工程学院;
【基金】：国家自然科学基金项目(51308359;51378323) 河北省自然科学基金项目(E2013210103;E2014210138) 河北省高等学校科学技术研究基金项目(QN20131169;QN2015213)
【分类号】：U441.3

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