中文摘要：

本文对《公路桥梁抗震设计细则》（JTG/TB02-01-2008）、《城市桥梁抗震设计规范》（CJJ 166-2011）规定的不同种类桥梁的E1和E2抗震重要性系数或调整系数（Ci）对应的地震重现期（年）,依据极值Ⅲ型烈度概率分布进行了计算,得到公路A类、B类、C类、D类桥梁E1、E2地震作用地震重现期,得到城市乙类、丙类、丁类桥梁E1、E2地震作用地震重现期,为桥梁的抗震设防水准提供依据。分析了《城市桥梁抗震设计规范》（CJJ 166-2011）基于不同基本烈度或峰值加速度确定的调整系数的合理性。

英文摘要：

In this paper,based on the type Ⅲ of the extreme value of intensity probability distribution,the earthquake return periods corresponding to the E1 and E2 seismic importance correction factor or the adjustment coefficient（Ci） of ＂Guidelines for Seismic Design of Highway Bridges＂（JTG/TB02-01-2008） and ＂Code for Seismic Design of Urban Bridges＂（CJJ 166-2011）,were calculated,and the basis for the bridge seismic fortification level were provided. The rationality of the adjustment coefficients based on different basic intensity or peak acceleration of ＂Code for Seismic Design of Urban Bridges＂（CJJ 166-2011）,were analyzed.