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

通过风洞试验，研究了风障对两种箱梁的气动响应和风环境的影响：钝型梁（宽高比为3.44）和流线型梁（宽高比为7）。气动响应不受风障截面结构和开口形状的显著影响。PIV试验表明，增大孔隙率可以显著增加梁上的湍流强度，减小梁上的涡大小，从而显著地稳定了梁上的风激振动。防风屏障（气孔率为50%）可使流线型梁上的风速降低近50%，而对钝形梁上的风速降低作用有限。

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.