基于美国规范的机场高架桥抗震分析

Seismic Analysis of Airport Viaduct Based on American Code

在美国规范下,为研究机场站前高架桥的地震反应性能,分析桥梁下部结构的影响,达到指导高架桥设计的目的,以某东南亚机场高架桥为研究对象,利用有限元软件建立三维模型,分析其非常规墩柱尺寸对整体桥梁结构地震反应的影响,并对桥梁进行延性抗震设计验算。结果表明:采用上大下小的变截面圆柱墩,主梁采用宽度为32.8 m的整体式箱梁,通过验算控制截面,得出墩底是较为薄弱的截面。其内容可为其它类似桥梁抗震工程提供借鉴。

In order to study the seismic response performance of the viaduct in front of the airport station according to American code,the influence of the bridge substructure is analyzed to guide the design of the viaduct.Taking a viaduct of a Southeast Asia airport as the study object,the model is established by using the finite element software to analyze the influence of its unconventional pier-column size on the seismic response of the overall bridge structure,and to check the ductile seismic design of the bridge.The results show that the variable section cylindrical piers with large top and small bottom are adopted,and the main beam adopts an integral box girder with a width of 32.8 m.Through the check of control section,it is shown that the pier bottom is the weaker section.The content can provide reference for the seismic engineering of other similar bridges.