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某市中心环形钢桁架人行天桥平面呈八边形,主梁采用钢桁架简支梁与钢箱梁钢架结构相组合的形式,有效解决了环形钢桁架人行天桥温度变形的释放问题。基于天桥的设计过程,重点介绍了此类型桥梁设计过程中桥型结构选择、主梁断面构造与景观设计。采用空间有限元程序对该桥逐跨进行动力特性分析。结果表明:该环形钢桁架人行天桥结构安全,各节段竖向自振频率均大于3Hz,动力特性满足规范要求。
The annular steel truss pedestrian bridge in a city center is octagonal, and the main girder adopts the combination of steel truss simply supported girder and steel box girder steel structure to effectively solve the problem of temperature deformation of the circular steel truss pedestrian bridge. Based on the design process of flyover, the bridge structure selection, main girder section structure and landscape design in this type of bridge design are mainly introduced. The finite element program is used to analyze the dynamic characteristics of the bridge. The results show that the structure of the steel truss footbridge is safe and the vertical natural frequencies of each section are greater than 3Hz. The dynamic characteristics meet the requirements of the code.