Windresistant design (1)

[56] EXPERIMENTAL STUDY OF THE COMBINATION OF WIND LOADS USING WITH POD ANALYSIS

○Diasuke Somekawa¹, Yumi Iida¹, Tetsuro Taniguchi² (1.Technical Research Inst. Obayashi Corp., 2.Graduate School of Eng., Osaka City University)

Keywords:POD analysis, Coherence, Combination of wind loads

This paper describes investigation on aerodynamic stability of 3-span continuous steel box girder bridge with main span of 185m. This bridge has very small B/d compared to the existing bridges, the possibility of galloping and vortex induced oscillation is predicted. So wind tunnel tests are conducted to investigate the countermeasure.First, wind tunnel test with sectional models are conducted and it is concluded upper and lower horizontal plate and flap are necessary to suppress galloping and vortex induced oscillation. Wind tunnel test with full bridge model is conducted to verify the countermeasure proposed with sectional model test under smooth flow and boundary layer turbulence.