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以主跨310m的天津塘沽海河既有独塔斜拉桥拓宽工程的初步设计方案为背景,通过一系列弹簧悬挂节段模型风洞试验研究了箱形分离平行双幅桥之间的气动干扰效应对其颤振稳定性能和涡激共振特性的影响.结果显示:气动干扰效应使得箱形分离平行双幅桥与既有单幅桥相比,颤振临界风速明显降低,主要气动导数曲线递减至递增的转折点也明显提前,颤振稳定性能变差;气动干扰效应还使得箱形分离平行双幅桥与既有单幅桥相比,竖弯和扭转涡激共振最大幅值和风速锁定区间都有显著增大,涡激共振起振风速降低,斯脱罗哈数有所提高.结果还显示:气动干扰效应对箱形分离平行双幅桥下风侧桥的颤振和涡振性能的影响要比对上风侧桥的影响更大.因此,在将既有桥拓宽成分离平行双幅桥时必须考虑气动干扰效应对其颤振稳定性能和涡激共振特性的影响.
Based on the preliminary design scheme of the existing span of 310m Tianjin Tanggu Haihe River existing single tower cable-stayed bridge, a series of spring suspension section wind tunnel tests were carried out to study the aerodynamic interference effect of the box-type split parallel double-deck bridge The flutter stability and the characteristics of vortex-induced vibration.The results show that the aerodynamic interference effect makes the box-separated parallel double-deck bridge significantly reduce the flutter critical wind speed compared with the existing single-decked bridge, and the main aerodynamic derivative curve decreases to an increasing The turning point is obviously earlier and the stability of the flutter is worsened. The aerodynamic interference effect also makes the box-shaped separation parallel double-deck bridge significantly increase the maximum amplitude of the vertical bending and torsional vortex-induced resonance and the wind speed locking range compared with the existing single-bridge The results show that the effect of aerodynamic interference on the flutter and vortex-vibration performance of the wind-driven side-bridge under the box-type parallel double-deck bridge is better than that on the windward side The influence of the bridge is greater, therefore, the influence of the aerodynamic interference on the flutter stability and the characteristics of the vortex-induced vibration must be considered when expanding the existing bridge into separate parallel double-deck bridges.