Experimental Study on the Aerodynamic Characteristics of a Rectangular-section Bridge Pylon with Corner Cuts and Slots
Based on the wind tunnel test method using a rigid model for measuring pressure,the change rule of aerodynamic characteristics of a rectangular cross-section bridge pylon with different corner cutting and slot-ting rates with the wind angle was investigated.The findings indicate that a rectangular cross-section bridge py-lon with cut corners and slots displays varying aerodynamic characteristics depending on the wind angle,exhibiting two critical wind angles,namelyαcr1 andαcr2.Additionally,it was observed that the aerody-namic characteristics experience sudden changes when the wind angle approaches the critical values.When the wind angle increases within the range of 0°toαcr1 andαcr2 to 90°,there is a decrease followed by an increase in both the mean drag coefficient and the fluctuating lift coefficient,while the Strouhal number shows an increase followed by a decrease.When the wind angle is betweenαcr1 andαcr2,there is little variation in the mean drag coefficient and fluctuating lift coefficient,and the Strouhal number dis-appears.The range between the two critical wind angles diminishes with rising corner-cutting rates,while it ascends with growing slotting rates.At the same wind angle,there is minimal influence on aer-odynamic characteristics based on the slotting rate.As the corner-cutting rate increases,the mean drag coefficient decreases,the Strouhal number increases,and the fluctuating lift coefficient varies less.
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