钢桁架人行天桥结构特性影响参数分析

Analysis of Influence Parameters of Structural Characteristics of Steel Truss Pedestrian Bridge

以福州城市森林步道鱼腹式钢桁架人行桥结构为工程背景,采用Midas Civil有限元软件对该轻型结构性能进行分析,并进一步分析弦杆、竖向腹杆和斜向腹杆壁厚关键设计参数变化对结构主要性能指标的影响规律。结果表明:弦杆参数是影响钢桁架人行桥结构强度、刚度、稳定性和自振频率的主要构件,竖向腹杆和斜向腹杆参数对结构特性影响较小。该研究结论可为同类桁架人行天桥结构设计提供参考和借鉴。

This paper takes the fish-belly steel truss footbridge structure of Fuzhou urban forest footpath as the engi⁃neering background,and uses Midas Civil finite element software to analyze the performance of this light structure,and fur⁃ther analyzes the influence of the changes of key design parameters of chord,vertical and oblique belly wall thickness on the main performance indexes of the structure.The results show that the chord parameters are the main components that affect the strength,stiffness,stability and natural vibration frequency of the steel truss footbridge structure,and the vertical and oblique abdominal parameters have little influence on the structural characteristics.The conclusion of this study can provide reference for the structural design of similar truss pedestrian Bridges.