Method for judging bridge structural stiffness changes based on bridge health monitoring deformation data

Abstract

The invention discloses a method for judging the stiffness change of a bridge structure based on bridge health monitoring deformation data. The specific judgment is divided into six steps, and the bridge structure is analyzed; a dynamic weighing system is installed at the position of the vehicle on the bridge to monitor the vehicle load; Bridge load data under certain conditions; collect deflection and deformation data of the bridge for a month or more, and establish a standard model diagram; after establishing the standard model diagram, it is necessary to continue to collect deflection deformation and vehicle load data for a period of time to ensure the accuracy of the model ; Realize the change discrimination of bridge stiffness. In the present invention, by constructing the relationship model between the stiffness change of the bridge member and the normal distribution curve of the deformation, the change of the bridge stiffness can be judged by the change rule of the bridge deformation value; compared with the traditional static load test, the present invention does not need to waste a large amount of Manpower and material resources do not need to block bridge traffic, which has played a positive role in promoting the deep mining and application of bridge health monitoring data.

Description

Technical field [0001] The invention relates to a method for determining the stiffness change of a bridge structure, in particular to a method for determining the stiffness change of a bridge structure based on bridge health monitoring deformation data, and belongs to the technical field of bridge health monitoring. Background technique [0002] At present, the change of bridge stiffness is mainly determined by measuring the deflection and deformation of the bridge span section. At present, the most commonly used test method is static load test. By measuring the deflection change of the bridge under the loading test load, the stiffness change of the bridge is calculated through the conversion of bearing capacity, so as to ensure the safe operation of the bridge. However, the static load test involves a lot of manpower, material and financial resources, and the test needs to block traffic, which has a certain impact on the normal operation of the bridge. The test cannot simulate t...

AI Technical Summary

Problems solved by technology

However, the static load test requires a lot of manpower, material resources, and financial resources, and the test needs to block traffic, which has a certain impact on the normal operation of the bridge, and this test cannot simulate the damage of the bridge stiffness under the continuous action of dynamic loads. A detection method of "hindsight" cannot monitor the stiffness changes of the bridge for a long time, and cannot play the role of early warning

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