Bent arch bridges are a kind of novel structural form, and the components for spatial rod structures with densely arranged components exert significant shielding effects on wind load. By taking an irregular bent arch with densely arranged arch rib components as the engineering background, wind tunnel tests of the sectional model of two square arch ribs and two rectangular arch ribs with and without flanges were conducted to obtain the influence of center distance on the aerodynamic drag and aerodynamic lift coefficient of arch ribs within the wind direction angles of 0°?90°. Meanwhile, the characteristics of the shielding effect of arch rib components on wind load were analyzed. The results of wind tunnel tests show that the shielding effect of windward arch ribs will significantly reduce the drag coefficient of leeward arch ribs. The smaller center-to-center distance ratio leads to the smaller drag of leeward arch ribs. As the wind direction angle increases, the shielding effect of windward arch ribs is weakened, with the shielding effect basically disappearing at the wind direction angle of more than 30°. The influence of flanges on the aerodynamic drag of leeward arch ribs is related to the center-to-center distance ratio and wind direction angle. In the wind direction angle of 0°?30°, the flanges have almost no influence on the aerodynamic drag of leeward arch ribs. In the wind direction angle of 30°?90°, the flanges lead to difference in the aerodynamic drag of leeward arch ribs, with the difference related to the center-to-center distance ratio.