某钢箱人行天桥动力特性及广告牌加设方案分析

The Dynamic Characteristics of a Steel- box Pedestrian Bridge and Program Analysis of Pedestrian Bridge Installed with Billboard

由于钢结构强度高、自重轻的优点,并且能适应城市的发展需要,在近十多年来得到了很大应用。然而,随着城市建设的大力发展和人口的日益增长,加之人们对美学的要求,钢结构人行天桥的负荷程度日益增加,因此,对现有钢结构人行天桥进行可靠性分析是十分重要的。本文针对这一现状,以陕西省府谷县金信广场人行天桥为例,为使该人行天桥安全的加装广告牌,对其进行了现场荷载试验,简要分析了人行天桥静力,动力特性,通过分析该人行天桥的自振频率和位移时程,指出了广告牌在该桥中存在的问题,并提出了相应广告牌加固改造措施,可为类似结构的人行天桥设计、施工及维修养护提供参考。

As a result of own merit of high strength and light weight, the steel structure, matched the development of cities,obtained the widespread application in recent ten years.However,the pedestrian bridges＇ burthen has been gradually increasing because of rapid development of urban construction and steady expanding of population,together with people ＇s aesthetic requirements,therefore,it is urgent to analyse the reliability of the existing steel pedestrian bridges. In view of the existing situation,with the pedestrian bridge of jinxin plaza in Fu Gu county,Shaanxi,for example, to ensure the safety of installing billboards on the pedestrian bridge, a site loading test has been done,and briefly analyse the static and dynamic characteristics of the pedestrian bridge. Through the analysis of the natural frequencies and the displacement time history of the pedestrian bridge,pointed out the existing problems about the billboard on the bridge,and proposed corresponding measures about reinforcing and reforming the billboards. It can serve as references for the design,construction and maintenance of the similar pedestrian bridge structure.