Axle coupling system model and method for bridge damage identification test

Abstract

The invention discloses an axle coupling system model and a method for a bridge damage identification test. The system model consists of a bridge model, a movable loading trolley, an approach bridge,a traction limiting system and a data acquisition processing system; the bridge model comprises a pavement slab, a bridge superstructure, a support and a abutment base; the approach bridges are divided into an upper approach bridge and a lower approach bridge, each approach bridge comprises a steel truss formed by welding profile steel and a height-adjustable Ferris wheel, and the approach bridgesare respectively connected with the bridge model and a limiting plate through assembly; the traction limiting system comprises a winch, a traction steel cable, a fixed pulley, a limiting rail and thelike; and the data acquisition system comprises an ultrasonic ranging sensor, a strain gauge, a displacement sensor, an acceleration sensor, a matching gateway, a data processing terminal and the like. The axle coupling system method not only can be used for testing static and dynamic performances of the bridge structure, but also can be used for testing and researching the damage identificationmethod of the bridge structure under the load of a moving vehicle.

Description

technical field [0001] The invention belongs to the technical field of bridge model tests, in particular to a model of a vehicle-bridge coupling system used in a bridge damage identification test and a method for using it. Background technique [0002] my country is the country with the largest number of bridges in the world. While a large amount of transportation infrastructure brings convenience, its operation and maintenance also face many problems and challenges. Due to improper use and maintenance, serious overloading, design and construction defects, traffic accidents, environmental erosion, natural aging of materials and many other factors, many bridges are damaged and partially damaged. At present, although a small number of new long-span bridges have installed bridge health monitoring systems, the actual effect is still not satisfactory, and it is difficult to meet the operation and management needs of large-scale and wide-ranging highway bridges. However, for sma...

AI Technical Summary

Problems solved by technology

Regarding the selection of the excitation source (input signal) in the overall assessment technology, the damage identification based on the dynamic response of the structure under the random excitation of the environment has always attracted much attention, but there are still many problems: such as uncontrollable load conditions, large signal-to-noise ratio, unstable Due to the influence of dynamic nonlinear signals, it is difficult to excite the high-order mode shapes of bridges (while the damage of civil structures is often local damage that causes high-frequency mode changes), etc.

However, the response of the vehicle-bridge coupling system is relatively complex, and it is greatly affected by road irregularities and environmental noise in practical applications. Simple analytical analysis and numerical simulation often cannot meet the requirements of identifying bridge damage based on the vehicle-bridge coupling response in practical applications. It is necessary to carry out corresponding tests

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