Comparisons between wind tunnel tests on a full aerolastic model and numerical results of the Izmit Bay Bridge

This paper presents a comparison between experimental and numerical analysis of the aeroelastic stability of the Izmit Bay Bridge, a record span suspended bridge that will be built in Turkey crossing the homonymous bay. Wind tunnel tests were performed on a 1:220 scale aeroelastic model. Experimental records show a double instability involving symmetrical and anti-symmetrical mode shapes at the same wind speed of 82 m/s. To analyze this phenomenon a numerical multi-modal aeroelastic model has been used. Numerical results confirm that this double instability occurs at the same wind speed if the side spans modes are included in the analysis.