基于结构的固有模态坐标 ,提出了用于大跨度桥梁耦合抖振响应分析的有限元正交组合 (completequadraticcombination ,CQC)方法 .在合理假设基础上 ,推导出桥梁结构的节点等效气动抖振力公式 .结合有限元方法和随机振动理论 ,给出了桥梁结构节点位移和单元内力功率谱密度和方差响应的计算方法 .该方法可以考虑自然风的任意风谱和空间相关性以及桥梁结构抖振响应的多模态耦合效应 ,且计算效率较高 . Based on the intrinsic mode modal coordinates of the structure, a completequadraticcombination (CQC) method for coupled buffeting response analysis of long-span bridges is proposed.Based on the reasonable assumption, the node equivalent aerodynamic chattering Force formula, the calculation method of bridge structure node displacement and unit internal force power spectral density and variance response is given by combining the finite element method and stochastic vibration theory. This method can consider the random wind spectrum and spatial correlation of natural wind and the bridge structure shaking The multi-mode coupling effect of vibration response is high, and the calculation efficiency is high.