Abstract：The buffeting response of a structure is very complex, and in main wind resistant design codes/specifications of structures, the equivalent static wind loads (ESWL) is adopted to instead the real dynamic buffeting analysis. The multi-target ESWL calculation method of long-span bridges is studied from a new perspective. Firstly, load response correlation (LRC) method was used to estimate ESWL vectors at the nodes of girders of the long-span bridge and then to form the ESWL matrix . Secondly, the proper orthogonal decomposition (POD) technique was applied to attaining the proper orthogonal matrix of . Thirdly, with the buffeting response extreme values of the girder regarded as the equivalent targets, the first i-order proper modes of were used as the base vectors to reconstruct ESWL, so that the multi-target ESWL can be obtained in least square meaning. Finally, East Sea cable-stayed bridge was used as an example to validate the effectiveness of the method. The results indicate that the accuracy of buffeting responses calculated by multi-target ESWL and the rationality of ESWL distribution are acceptable by using the proposed method, because after POD, the matrix contains both the fluctuating wind pressure information and the buffeting response information, which are ordered according to the significance.
