国家会展中心(天津)工程大跨度人行天桥设计

Design of large-span pedestrian bridge in National Convention and Exhibition Center (Tianjin) project

国家会展中心(天津)工程一、二期之间跨越市政道路的两座人行天桥均为大跨度人行天桥,外观及功能相同,但由于1#人行天桥下市政管线复杂,相比2#人行天桥少一个桥墩,其跨度更大,最大跨度达到90.2m,且两座人行天桥扶梯楼梯等附属结构多,结构设计更复杂。以较大跨度的1#人行天桥为例,介绍了钢结构大跨度人行天桥的主要设计要点,采用MIDAS软件对1#人行天桥进行了结构受力分析,同时对人行舒适度进行验算。分析结果表明:1#人行天桥结构体系刚度均匀,整体性良好,设计合理;大跨度钢桁架在跨中和支座处的受力较大,需要适当加强;1#人行天桥的各项验算结果能够满足设计需求。

The two pedestrian bridges spanning municipal roads between the first and second phases of the National Convention and Exhibition Center(Tianjin) project are long-span pedestrian bridges with the same appearance and function, but due to the complexity of municipal pipelines under the 1# pedestrian bridge, there is one less pier and larger span than 2# pedestrian bridges, the maximum span of the 1# pedestrian bridge reaches 90.2 m. There are many auxiliary structures such as escalators and stairs on the two pedestrian bridges, and the structural design is more complicated. Taking the 1# pedestrian bridge with a large span as an example, the main design points of the steel structure long-span pedestrian bridge were introduced. MIDAS was used to analyze the structural force analysis of the pedestrian bridge and the pedestrian comfort was checked. The results show that the 1# pedestrian bridge has uniform stiffness, good integrity and reasonable design. The long-span steel truss has a large force at the mid-span and the support, which needs to be properly strengthened. The verification results of the 1# pedestrian bridge can meet the design requirements.