根据连续梁桥的实际受力特点，建立了考虑下部结构非线性响应与上部结构共同作用的简化计算模型．通过延性性能分析得到桥墩的非线性动力特性，并采用等价线性化给出其等效动力参数．采用根据规范（ＪＴＪ００４—８９）建立的变阻尼位移反应谱，通过迭代求解全桥结构的设计地震响应．算例分析表明，提出的方法简单实用，并且具有相当精度 According to the actual characteristics of the continuous beam bridge, a simplified calculation model considering the interaction between the substructure nonlinear response and the superstructure is established. The nonlinear dynamic characteristics of piers are obtained by ductility analysis and their equivalent dynamic parameters are given by equivalent linearization. By using the variable damping displacement response spectrum established according to the code (JTJ004-89), the design seismic response of the full-bridge structure is solved iteratively. The case study shows that the proposed method is simple and practical and has a good accuracy