天津永乐桥摩天轮结构设计

天津永乐桥摩天轮建于子牙河上，轮桥一体，建筑造型新颖。摩天轮轮盘采用预应力拉索支承结构，直径达110m。介绍了永乐桥预应力拉索支撑摩天轮设计中主要问题，重点介绍了游艺类结构的设计要求。摩天轮设计分析时重点考虑了地震作用的影响，并采用了时程分析的方法进行了计算对比，结果表明振型分解反应谱法分析结果应适当调整后再用于结构设计。摩天轮轮盘是受压结构，设计时针对结构整体稳定问题进行了专题研究，分析结果表明永乐桥摩天轮结构稳定性满足要求。节点设计是摩天轮结构设计的重要部分，设计中对各节点进行了实体受力分析，得到了满意的结果。受施工条件的限制，摩天轮结构施工方法也成为结构可行性的控制因素，设计中针对摩天轮结构施工方法进行了分析，提出了适合施工现场情况的施工方法与施工过程。

Structure design of Great Wheel on Tianjin Yongle Bridge

A great wheel, built on Tianjin Yongle Bridge, takes a new architecture form. The wheel supported by pre-stressed cable, is 110m in diameter. The main problems in the design process are discussed in this paper, especially the requirements of the amusement device. Time-history analysis is used while studying the seismic action, and the results show that the seismic action from response spectrum method analysis should be adjusted when used for design. The stability of the wheel is a key problem for the great wheel, which is studied in the structure analysis and the results show that the stability of the wheel meet the requirements of the Code. The joint design is an important part of the structure design, and joint analysis is done and satisfactory results are obtained. Another key problem is the construction process analysis, which is extensively studied, and a construction sequence is proposed.