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Based on the modal coordinates of the structure, a finite-element and CQC (completequadratic combination) method for analyzing the coupled buffeting response of long-span bridges ispresented. The formulation of nodal equivalent aerodynamic bufeting forces is derived based on areasonable assumption. The power spectral density and variance of nodal displacements and elementalinternal forces of the bridge structure are computed using the finite-element method and the randomvibration theory. The method presented is very efficient and can consider the arbitrary spectrum andspatial coherence of natural winds and the multimode and intermode effects on the buffeting responses ofbridge structures. A coupled bufeting analysis of the Jiangyin Yangtse River Suspension Bridge with1385 m main span is performed as an example. The results analyzed show that the multimode andintermode effects on the bufeting response of the bridge deck are quite remarkable.