摘要：文中以某跨度420米的钢管拱桥为例，通过时域数值计算，分析了Rayleigh阻尼和Caughey阻尼两种阻尼模型下拱桥地震反应在的特点与区别，并同结构地震波响应的真实解进行了比较，讨论了不同阻尼模型的适用范围及有效性。文中最后提出了运用柯西阻尼时需要注意的问题。

Abstract: The dynamic response history of a 420 meters long span bridge under the excitation of seismic wave was analyzed. The computation results using Rayleigh and Caughey damping models were compared with the exact solution, and the differences between the effects of the two damping models were pointed out. Further discussions were made about the applicability and validity of different damping models. Finally, some caveats about the application of Caughey damping model were proposed at the end of the paper.