Experimental investigation on the adjustable wind barrier for the long-span strait bridge

通过风洞试验，研究了风障对宽高比为3.44的海崖梁和宽高比为7的流线型箱梁的气动响应和风环境的影响，风障截面形状和开口形状对气动响应影响不大。PIV试验表明，孔隙率的增加显著提高了湍流强度，减小了主梁上的旋涡尺寸，从而显著稳定了主梁的风致振动;在流线型主梁上设置风障（孔隙率为50%）可以使风速降低近50%，而在海崖体主梁上设置风障对风速的降低作用有限。

Through the wind tunnel tests, this research investigated the effects of the wind barrier on the aerodynamic response and wind environment of two box girders: a bluff girder (width-to-height side ratio of 3.44) and a streamlined girder (side ratio of 7).The aerodynamic response was not significantly affected by the wind-barrier section configuration or the opening shape. Increasing the porosity ratio significantly stabilized the wind-induced vibration because that increasing the porosity ratio significantly increased the turbulence intensity and decreased the vortex size on the girder according to PIV tests.The wind barrier (porosity ratio 50%) can reduce the wind velocity on the streamlined girder by almost 50%, while it has limited effects on reducing it for the bluff one.