Beam bridge state evaluation method

Abstract

The invention relates to a beam bridge state evaluation method, which comprises the following steps of: 1) installing an FBG (fiber bragg grating) sensor on a beam bridge to be detected; 2) carrying out a quasi static load experiment on the beam bridge to be detected to obtain a control point deflection value; 3) comparing the control point deflection value obtained in the step 2 with a control point deflection value obtained by a finite element calculation model to obtain a beam bridge correction coefficient h; and 4) judging the working situation of the bridge structure according to the beam bridge correction coefficient h calculated in the step 3. The elevation method disclosed by the invention is convenient and practical; light load is used for replacing heavy load to lower the experiment expenditure; traffic interruption time is reduced; quasi static load or dynamic load is used for replacing static load; the analytical algorithm of the load experiment result can be directly obtained from a quasi static load experiment result so as to greatly lower the later-stage analysis difficulty of the quasi static load experiment data; and a quick load experiment method is used for replacing the traditional load experiment method.

Description

technical field [0001] The invention relates to a method of assessing the state of a bridge. Background technique [0002] Due to the influence of many factors such as bridge design load level, construction method and quality, material performance and structural integrity, the structural damage detection and state assessment of existing bridges is generally difficult to quantitatively analyze the state of bridge structures. It is even more difficult to determine the bearing capacity of the bridge. At present, the traditional method is mainly based on appearance survey, calculation and evaluation, supplemented by load test. Although the visual inspection and calculation of the bridge can quickly evaluate the structural state of the bridge, due to the influence of subjective factors, the accuracy is poor; although the load test accuracy is high, it is time-consuming and laborious, and it needs to interrupt traffic for a long time. [0003] With the improvement of modern ...

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Problems solved by technology

[0005] In view of the poor accuracy of bridge appearance inspection and the long-term interruption of traffic in load tests, in order to break through the limitations of traditional point-type strain test technology, the present invention adopts long-gauge quasi-distributed FBG sensing technology and quasi-static load test bearing capacity Combined with the evaluation methods, a set of evaluation methods and evaluation system with high precision and quick test for the bearing capacity of existing beam bridges are proposed

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