大跨度钢结构人行悬索桥受力性能对比分析

为了提高大跨度钢结构人行悬索桥的安全性能,以某实际工程为依托,采用有限元软件Midas/Civil建立整体空间模型,分析单缆体系和双缆体系在人群荷载和风荷载作用下的受力特点以及自振频率特性。结果表明:人群荷载作用下,双缆体系的底缆承担更多荷载,主梁挠度相比单缆体系减小约15%;风荷载作用下,两种结构体系主梁弯矩和挠度的变化趋势比较相似,双缆体系的弯矩和挠度均小于单缆体系;双缆体系的侧弯频率、竖弯频率、竖振频率以及侧振频率相比单缆体系均有所增加。双缆体系具有更优的力学性能,提高了工程安全性,并为类似工程的桥型选择提供有力参考。

Comparative Analysis on Mechanical Behavior of Long-span Steel Structure Pedestrian Suspension Bridge

In order to improve the safety performance of long-span steel structure pedestrian suspension bridge,based on a practical project,uses finite element software Midas/Civil to establish an overall space model,and analyzes the stress and natural vibration frequency of single-cable system and double-cable system under crowd and wind loads.The results show that,under the crowd load,the bottom cable of the double cable system bears more loads,and the deflection of the main beam is reduced by about 15%compared with the single cable system.Under wind load,the bending moment and deflection of the main beam of the two structural systems are relatively similar,and the bending moment and deflection of the double cable system are both smaller than that of the single cable system;the side bending frequency,vertical bending frequency,vertical vibration frequency and side vibration frequency of the double cable system are increased compared with the single cable system.The double cable system has better mechanical properties,improves engineering safety,and provides a powerful reference for bridge selection of similar projects.