南昌新八一大桥健康监测预警指标计算分析

Analysis of warning indices for bridge health monitoring of the eight one bridge in nanchang

为了保证桥梁健康监测系统的有效性和及时性,给桥梁管理者提供维修及加固的依据,以南昌市新八一大桥为工程背景,在有限元数值模拟结合传感器监测数据的基础上,建立了多指标并行预警的结构预警体系,阐述了预警指标、预警阈值和预警流程,并重点对索力、关键部位应力和挠度、疲劳车辆荷载、固有频率变化率等预警指标进行了计算分析。应用结果表明,在当前荷载作用下新八一大桥的各项预警指标的结果都正常,满足使用要求。

To ensure the effectiveness and timeliness of the bridge health monitoring system and provide the basis for the maintenance and reinforcement of bridge managers,based on the finite element analysis and sensor monitoring data the structural health monitoring system of the Eight one bridge in Nanchang was taken as the research object and a structural early warning system for multi index parallel warning was proposed.The early warning indices,thresholds and workflow were elaborated and the warning indices,such as cable force,The key section of stress and vertical deformation,fatigue vehicle loads,and the change rates of natural frequencies were particularly calculated and analysed.The results of the research demonstrate that under the current load circumstances,the results of these warning indices are normal and the components can meet the operation requirements.