ABSTRACT
The general method to obtain vehicle load is to apply weigh-in-motion (WIM) system, nevertheless, in case of WIM system is not set on the bridges, it almost could not provide the actual lane load in order to meet the requirements of bridge structural performance evaluation.
In this paper, an innovation method of creating lane load on highway bridges is presented by means of deck video monitoring (DVM) integrated with WIM system. To detect and track the vehicle from the monitoring video, serial techniques of computer vision (CV) are applied, including image preprocessing, background processing, vehicle detection and tracking.
Moreover, To Attempt the acquisition of the actual vehicle loading, a numerical simulation method is developed to generate vehicle load by a random decision tree, based on data correlation analysis of the statistical properties of passing vehicles obtained from DVM and WIM.
With this, the distribution of time-space characteristic of passing vehicles classified into several types are obtained respectively, involving the transverse and spatial distributions of vehicle load on different lane at optional cross section. A case study on image processing of image captured by monitoring camera. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig25_1.jpg"/> Transverse distribution of axle flow for different types of vehicle on different lane. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig25_2.tif"/> Typical spatial spectrum of traffic flow for different types of vehicle with background image. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315207681/cd556cd4-4dcf-4efe-8e29-56fc67b8bfbd/content/fig25_3.tif"/>
Furthermore, the spatial spectrum generated by matrix transforming can show intuitively the vulnerable region of steel box girder against the fatigue issue.
This approach has be applied triumphantly to the evaluation of structural performance and the maintenance of Sutong Bridge which has no WIM.
