体外预应力钢箱梁桥具有结构轻盈、建筑高度小、建造速度快等优点,具有很好的应用前景。结合一个工程实例,用有限元方法对该桥型的地震效应进行分析,对其动力特性、E1和E2作用下的动力效应进行了计算,给出了前20阶自振频率、振型和地震作用下的内力、位移,对计算结果进行了分析讨论。分析表明,体外预应力钢箱梁桥具有较好的抗震性能。 External prestressed steel box girder bridge has the advantages of light structure, small building height and fast construction speed, and has good application prospect. Combined with an engineering example, the seismic effect of the bridge type is analyzed by finite element method. The dynamic characteristics of the bridge type are calculated. The dynamic effects under E1 and E2 are calculated. The first 20 natural frequencies, modes and earthquakes Under the action of internal forces, displacement, the calculation results were analyzed and discussed. Analysis shows that the external prestressed steel box girder bridge has good seismic performance.