体外预应力钢箱梁桥地震效应分析

Seismic Effect Analysis of Externally Prestressed Steel-Box Girder Bridge

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。

The externally prestressed steel-box girder bridge is a novel structure,it has the advantage of lightness,less height and fast construction speed,the structure has a very bright application prospect in the future.The seismic effect of this kind of bridge is analyzed with the finite element method in combination of engineering practices.The dynamic characteristics,dynamic response under the action of E1 and E2 is calculated.The results of first twenty natural frequencies,mode of vibration,internal force and deflection under the action of seismic are listed and discussed.The results indicate that the externally prestressed steel-box girder bridge has a good seismic performance.