Vehicle load dynamic weighing method for orthotropic bridge deck steel box girder bridge

Abstract

The invention discloses a vehicle load dynamic weighing method for an orthotropic bridge deck steel box girder bridge, which relates to the field of bridge health monitoring. The method comprises the following steps of: mounting a fiber grating strain sensor at the bottom of a U-shaped rib of an internal top plate of an orthotropic bridge deck steel box girder; measuring longitudinal bridge strain of the U-shaped rib when a vehicle passes through the position of the sensor; converting the strain into an optical signal by the sensor; demodulating the optical signal by using a fiber grating demodulator; carrying out cross-correlation analysis on actually measured strains of measuring points on the same U-shaped rib in the steel box girder at different sections so as to determine vehicle speed of the vehicle; analyzing actually measured strain area vectors of measuring points on different U-shaped ribs in the steel box girder at the same section; and carrying out angle Cosine distance analysis by using a strain effect linear area vector of the U-shaped rib of the steel box girder so as to figure out transverse acting position and weight of each vehicle on a running lane. The vehicle load dynamic weighing method for the orthotropic bridge deck steel box girder bridge, disclosed by the invention, has the advantages of convenience for mounting, low manufacturing price, no need of interrupting transportation, no excavation or damage of the road surface and capability of achieving nondestructive and automatic dynamic weighing of the bridge vehicle load.

Description

Technical field [0001] The invention relates to the field of bridge health monitoring, in particular to a vehicle load dynamic weighing method for an orthotropic bridge deck steel box girder bridge. Background technique [0002] At present, when road vehicles in our country transport goods, there is a widespread phenomenon of overweight, and overweight vehicles account for a very high proportion. Overweight damage to the road is very serious, and the country has to invest a lot of financial, material and manpower to repair and strengthen each year. Overloading poses a huge safety hazard to pedestrians and vehicles on the road, and evades a lot of road taxes and fees. Accidents of road damage and bridge collapse caused by overrun and overload problems are also common. Therefore, vehicle dynamic weighing technology has become one of the indispensable development directions in highway bridge health monitoring. [0003] Currently, the dynamic weighing system has several different st...

AI Technical Summary

Problems solved by technology

After the bending plate dynamic weighing instrument is used for a long time, the sensitivity of the resistance strain gauge decreases and needs to be recalibrated, and the resistance strain gauge is susceptible to electromagnetic interference

[0007] At present, the dynamic weighing systems on the market are all buried in the road surface, and the traffic must be completely or partially closed during installation, affecting road traffic, and the road surface must be excavated during construction, causing damage to the road surface structure

In addition, the system is buried under the road surface, which has high requirements for waterproof sealing, anti-corrosion, and cable protection of the system. The construction of the system is complex, susceptible to electromagnetic interference, and the overall cost is relatively high.

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