地面效应对近流线型断面涡激共振性能的影响
发布时间：2018-08-14 08:45
【摘要】：当桥面接近地面时,地面的存在会使断面的绕流情况与远离地面时不同,有可能对主梁在风荷载作用下的静力和动力响应产生不利的影响,而主梁离地高度将成为影响主梁气动性能的重要因素。基于风洞试验和计算流体动力学(CFD)相结合的方法,对存在地面效应的近流线型断面的涡激共振性能进行研究。首先,基于风洞试验获得近流线型断面在两种粗糙度地面、三种风攻角、四种离地高度下的涡激共振区间和振幅及其随离地高度的变化规律,试验结果表明,地面效应会使得涡激共振区间提前但涡激共振幅值有所减小。其次,采用CFD识别各试验工况下的断面的绕流特征、锁定区间和最大振幅,并通过静态和动态流场可视化分析,分析了地面效应对近流线型断面涡激振动的影响机理。
[Abstract]:When the bridge deck is close to the ground, the presence of the ground will make the flow around the section different from that when the bridge is far from the ground, which may have a negative effect on the static and dynamic response of the main beam under the wind load. The height of the main beam from the ground will be an important factor affecting the aerodynamic performance of the main beam. Based on the method of wind tunnel test and computational fluid dynamics (CFD), the vortex-induced resonance of near-streamline cross-section with ground effect is studied. First of all, based on wind tunnel test, the vortex-induced resonance region and amplitude of near-streamline section at two roughness ground, three wind attack angles and four different heights from the ground are obtained. The experimental results show that, The surface effect will make the Vortex resonance range advance but the co-amplitude of vortex-induced resonance decrease. Secondly, CFD is used to identify the characteristics of cross-section flow under different test conditions, and the maximum amplitude and interval are locked. The mechanism of the effect of ground effect on vortex-induced vibration of near-streamline section is analyzed by visual analysis of static and dynamic flow fields.
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本文编号：2182289
[Abstract]:When the bridge deck is close to the ground, the presence of the ground will make the flow around the section different from that when the bridge is far from the ground, which may have a negative effect on the static and dynamic response of the main beam under the wind load. The height of the main beam from the ground will be an important factor affecting the aerodynamic performance of the main beam. Based on the method of wind tunnel test and computational fluid dynamics (CFD), the vortex-induced resonance of near-streamline cross-section with ground effect is studied. First of all, based on wind tunnel test, the vortex-induced resonance region and amplitude of near-streamline section at two roughness ground, three wind attack angles and four different heights from the ground are obtained. The experimental results show that, The surface effect will make the Vortex resonance range advance but the co-amplitude of vortex-induced resonance decrease. Secondly, CFD is used to identify the characteristics of cross-section flow under different test conditions, and the maximum amplitude and interval are locked. The mechanism of the effect of ground effect on vortex-induced vibration of near-streamline section is analyzed by visual analysis of static and dynamic flow fields.
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本文编号：2182289
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