摘要
之江大桥主桥为(116+246+116)m拱形钢桥塔斜拉桥,采用半飘浮结构体系,主梁采用流线型扁平钢箱梁,全桥共88根斜拉索,空间双索面布置。为满足该桥管养与结构受力状态评估的需求,建立大桥结构健康监测系统,基于监测数据分析环境、荷载,以及运营状态下桥梁的空间位移、线形、应力应变和结构动力特性等参数,并对结构状态进行评估。结果表明,桥址每小时平均风速最大值集中在1月～3月,最大风速为9.7m/s,没有超过8级的蓝色预警;通过大桥的车辆类型主要是小客车或小货车、大客车或中货车,载重量在7t以下;在运营荷载作用下大桥空间变形较小,结构受力在合理范围内且弹性工作性能良好。
The main bridge of Zhijiang Bridge is a cable-stayed bridge of semi-floating structural system.The bridge has two arch-shaped steel pylons,containing spans of 116,246 and 116 m.The main girder adopts the stream-lined flat steel box girder.The stay cables are arranged in spatial double cable planes and a number of 88 stay cables are tensioned.To meet the demands of maintenance and evaluation of load bearing conditions of the bridge structure,the structural health monitoring system for the bridge was established.Based on the monitoring data,the environment and loads were analyzed,and parameters,like the spatial displacement,geometrical shape,stress,strain and dynamic property of the structure in the service condition were also analyzed.The conditions of the structure were evaluated.The results show that the maximum values of mean hourly wind speed densely appear in January,February and March,the biggest wind speed is 9.7 m/s,not surpassing theⅧblue warning.The vehicles passing the bridge are mainly cars or mini-trucks,bus or medium trucks,with weight less than 7 t.Under the action of operation loads,the spatial deformation of the bridge is small,the load bearing capacity of the bridge is in the reasonable range,and the flexible work performance of the bridge is good.
作者
李若涛
刘毅
LI Ruo-tao;LIU Yi(Hangzhou Highway Engineering Supervision&Consultant Co.,Ltd.,Hangzhou 310030,China;Hangzhou Jiaotou Technology Engineering Co.,Ltd.,Hangzhou 310024,China)
出处
《世界桥梁》
北大核心
2018年第6期88-92,共5页
World Bridges
关键词
斜拉桥
拱形钢桥塔
健康监测
线形
内力
状态评估
cable-stayed bridge
arch-shaped steel pylon
health monitoring
geometry
internal force
condition evaluation
