STUDY OF SHAPE OF CABLE-STAYED BRIDGE TOWER BY WIND TUNNEL TEST WITH RIGID MODEL

Abstract

A multi-span cable-stayed bridge is planned for the Osaka Wangan Expressway Western Extension. The main tower of this bridge has an “A” shape in the direction of the bridge axis in order to improve the rigidity, and has a height of over 200 meters, so ensuring wind resistance stability is important. In this paper, a part of the wind tunnel experiment conducted to confirm the wind resistance stability of the tower is reported. First, in order to select a cross-sectional shape with high wind resistance stability, a two-dimensional cross-sectional partial model test was conducted to confirm trends such as the size and angle of chamfering and corner cutting, and the presence or absence of slits. Next, considering this tendency, a wind tunnel experiment was conducted by a three-dimensional locking model, and the cross section with the highest wind resistance stability was selected.