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Bridge online monitoring

Bridge online monitoring

The significance of bridge health monitoring

Over the years, the safety of bridge structures has been a matter of public concern. Modern large-scale bridges are important nodes of major arterial roads and have a major impact on the development of transportation and are a symbol of national and regional economic development and technological progress. However, due to the lack of a comprehensive safety monitoring system for the bridge structure, any abnormalities in the structural state cannot be discovered in time. Once a safety accident occurs, economic losses and adverse social impacts will result. Therefore, building a bridge health monitoring system to provide long-term and real-time monitoring data for conservation management units is of great significance.


The main contents of bridge health monitoring 


Monitoring items and corresponding sensors

监测项

传感器

测点布设

挠度监测

压差式变形测量传感器

桥墩、桥塔、梁体、拱圈等

倾斜监测

盒式固定测斜仪

桥墩、桥塔、梁体、拱圈等

应力监测

表面式应变计

梁身、桥塔、桥墩等

索力监测

磁通量传感器

主塔拉杆、主跨吊

振动监测 

磁电式传感器

桥塔、桥墩、桥身等

裂缝监测 

裂缝计

最大缝宽处

温湿度

温湿度传感器

桥面、桥底、梁体

风速风向

风速风向仪

塔顶、跨中

1. Structural deformation monitoring
    Deformation of bridge structure includes deformation of pier tower, deformation of beam body, deformation of arch circle, foundation settlement, etc. The stability of the foundation of bridge structure is the prerequisite for ensuring the safe operation of bridges. The settlement of bridge foundation will cause many adverse effects on the bridge structure. Excessive settlement, especially uneven foundation settlement, can cause excessive internal forces, deterioration of bridge lines, and damage to the ancillary facilities of bridges. Through the monitoring of the settlement settlement of the bridge foundation and the monitoring of the bridge box beam deflection, the overall health and safety status of the bridge can be grasped. The foundation settlement of the bridge and the box girder disturbance are monitored by a static level system consisting of differential pressure measuring sensors. In addition, changes in the verticality of the pier during operation can be monitored remotely and in real-time using a cassette fixed inclinometer.

2. Structural stress monitoring
 The bridge deck directly bears the vehicle load and is most directly affected by the load. Therefore, the stress monitoring of the representative section of the bridge surface can be used to understand the stress status of the main load-bearing components, diagnose the bridge's disease in time, and control the vehicle load. Fatigue analysis of bridges and bridges provides data support. The surface strain gauges can be installed on the important parts of the bridge (bridges, main load-bearing components, key parts of the bridge, etc.) to monitor the force.

3. Cable force monitoring
 For cable bridges, such as arch bridges, cable-stayed bridges, and suspension bridges, the monitoring of cable force is an important part of health monitoring. The aging, fatigue, and stress changes of the cable will directly affect the structure's stress and safety. Suspension bridge boom as a local force member, using magnetic flux sensors for testing.

4. Structural dynamic performance monitoring
 The dynamic characteristics of the bridge (frequency, mode shape, damping, etc.) and the vibration level (vibration intensity and amplitude) are the signs of the overall safety of the bridge. The degradation of the bridge quality will cause the structural vibration characteristics to change, and thus the dynamic characteristics and vibration levels of the bridge. The monitoring can serve as a whole to monitor the health status of the bridge structure. Long-term monitoring of bridge vibrations can be accomplished by installing magnetic sensors.



5. Crack monitoring
 In the course of operation, the bridge is affected by various factors, and cracks may occur at the critical force parts. The development trend of cracks is an important indicator to determine the bearing capacity of structures. It is necessary to use crack gauges and data acquisition equipment to build monitoring systems for real-time monitoring.

6. Monitoring of environmental parameters
 The working environment includes many aspects such as environmental temperature, humidity, and wind direction. The temperature, humidity, and wind direction parameters can provide a basis for the analysis of the performance of the bridge structure.


What would you like to do?

Understand the work products.

Vibrating string reinforcement meter, vibrating string surface/embedded strain gauge,

Learn about application scenarios

Bridge, tunnel, highway slope, municipal foundation pit, subway rail transit, reservoir dam,