Aerodynamic characteristics of fundamental cross section

[31] Aerodynamic Stability of Seto Ohashi Bridge at Maintenance Stage

○Shigeki Kusuhara¹, Hiroshi Katsuchi², Masashi Naito², Akira Yamane¹, Akira Machida¹ (1.Honshu-Shikoku Bridge Expressway Company Limited, 2.Yokohama National University )

Keywords:Suspension bridge, Unsteady aerodynamic force coefficient, 3-D flutter analysis

Since the aerodynamic stability is one of the most important issues to realize the long-span bridges, various studies were carried out and the latest findings were applied to the construction of the Honshu-Shikoku Bridges. However, the countermeasure for aerodynamic stability may become temporally or partly invalid at the maintenance work. Therefore, it was required to confirm the aerodynamic stability of maintenance stage. In order to consider three dimensional effects, 3D flutter analysis which was developed for the Akashi-Kaikyo Bridge (world’s longest suspension bridge with main span of 1991m) was carried out using the aerodynamic forces measured by the 2D wind tunnel test. As a result of this study, it was found that the aerodynamic stability is kept at maintenance work.