大跨度悬索桥桥面挠度实时在线监测  

Monitoring of Deck Deflection of Long Span Suspension Bridge in Real Time on Line

作　　者：钟继卫[1,2] 王波[1,2] 史雪峰[1,2] 

机构地区：[1]中铁大桥局集团桥科院有限公司,湖北武汉430034 [2]桥梁结构安全与健康湖北省重点实验室,湖北武汉430034

出　　处：《桥梁建设》2011年第5期40-43,共4页Bridge Construction

摘　　要：为实时监测180t大件运输荷载作用下阳逻长江公路大桥的结构受力性能,利用该桥健康监测系统的桥面挠度监测子系统数据采集分析平台,对载重车过桥时桥面挠度变化全过程进行在线监测及数据分析。结果表明,载重车过桥过程中的桥面挠度实测值与理论计算值吻合较好,桥面挠度实测值均未超过设计最不利状态值;桥面"梅花形"布置的挠度测点能有效反应载重车单幅行驶时桥面的上、下游扭转效应。该桥面挠度系统还具有以下功能:通过分析各监测点峰值时间点推算出该载重车的行车速度、测试挠度影响线。分析结果也验证了桥面挠度监测系统的有效性及实用性。To monitor the structural mechanical behavior of Yangluo Changjiang River Highway Bridge under the load action of heavy-duty vehicle transportation of 180 t freight,the data collection and analysis platform of deck deflection monitoring subsystem of the health monitoring system of the bridge was employed to monitor in real time on line and to analyze the whole process of the deck deflection changes of the bridge as the heavy-duty vehicle passed through.The results of the monitoring and analysis show that the measured values of the deck deflection of the bridge during passing of the vehicle are well coincident with the theoretic values and the measured values do not exceed the values of the most unfavorable status of the design.The deflection measurement points laid in quincunx on the deck can effectively represent the torsional effect of the deck at its upstream and downstream sides as the vehicle passes on one lane on the bridge.Besides,the deck deflection monitoring subsystem has more functions of calculating the traveling speed of the vehicle and measuring the influential lines of the deflection through analysis of peak value time points of each monitoring point.The results of the analysis also verify the effectiveness and practical applicability of the subsystem.

关 键 词：悬索桥 挠度 监测 实时系统 影响线 

分 类 号：U446[建筑科学—桥梁与隧道工程] TP212[交通运输工程—道路与铁道工程]