双幅式梁桥挡风障阻风性能影响参数风洞试验

为研究挡风障参数、来流条件等因素对双幅式箱梁桥桥面阻风性能的影响程度，以某跨海双幅式桥梁为工程背景，开展基于实际桥梁的挡风障模型风洞试验。以车道风速折减系数为阻风性能评价指标，采用正交试验方法，研究挡风障安装片数、来流风偏角、来流风速、圆孔组合方式等参数对双幅式桥梁桥面风场影响，开展挡风障阻风性能影响参数分析。试验结果表明，迎风侧车道风速折减系数大于靠近背风侧车道，风速折减系数差值随着方案阻风性能提升而增加，最大达0.37；挡风障安装片数、来流风偏角、圆孔组合方式对挡风障阻风性能影响显著，来流风速对迎风侧车道等效风速折减系数影响较大，对背风侧车道等效风速折减系数无明显影响；各因素对迎风侧及背风侧车道阻风性能影响程度均有较大差异。安装片数对双幅式桥梁靠近迎风侧车道桥面风场影响较小，而对靠近背风侧车道影响较大，且其与来流风偏角及风速的交互作用不明显。

Wind tunnel test on the influencing parameters of twin parallel deck beam bridges wind barrier wind-resistance performance

In order to study the influence of wind barrier parameters, incoming flow conditions and other factors on the wind resistance performance of twin parallel deck bridges, a wind tunnel test on wind barrier models based on the actual bridge were carried out with a cross-sea twin parallel deck bridge as the engineering background. Taking the wind speed reduction coefficient as evaluation index of wind-resistance performance, the influence of number of wind barrier installation pieces, incoming wind deflection angle, incoming wind speed and the combination of holes on the wind field of the bridge deck was investigated based on orthogonal test, and the influence of wind barrier parameters on the wind-resist performance were analyzed. Results show that, the wind speed reduction coefficient of the lane on the wind barrier side is greater than that of the lane close to the leeward side, and the difference of the wind speed reduction coefficient increases with the improvement of the wind blocking performance of the scheme with the maximum value 0.37. Moreover, the number of wind barrier installation pieces, the deflection angle of the incoming wind, and the combination of round holes have significant influence on the wind-resistance performance of the wind barrier. The incoming wind speed has a greater influence on the equivalent wind speed reduction coefficient of the windward lane, while has ignorable influence on the equivalent wind speed reduction coefficient of the leeward lane. Also, the influence of different wind barriers parameters on wind-resistance performance on different lanes such as windward lane and leeward lane are significantly different. The interaction between the number of installation pieces, the incoming wind angle and the wind speed can be neglected. The number of installed pieces has little effect on the wind barrier of twin parallel deck bridges near the windward side lane, but has a greater impact on the leeward side lane, and its interaction with the incoming wind deflection angle and wind speed can be neglected.