Abstract:In order to simplify identification algorithm about aerodynamic admittance function of typical bridge section, some assumptions are usually adopted, such as ignoring correlation spectrum component about stochastic wind wave, assuming equivalence about vertical- and horizontal- spectrum component between stochastic wind wave and buffeting force history, and neglecting precision evaluation about identification algorithm system and testing sampling process. For the above shortcoming, the so-called “Modified Correlation Spectrum Identification Method” was proposed, which can synchronously consider multi-component effects between stochastic wind components and buffeting forces, and its precision and effectiveness were also validated with the help of numerical simulation. Finally, using the high-frequency force-measured balance in wind tunnel tests, multi-component admittance functions about streamline box-girder cross-section bridge model were identified.