Fabricated type bridge hinge joint damage classification and grading evaluation method and system

Abstract

The invention discloses a fabricated type bridge hinge joint damage classification and grading evaluation method and system. The method comprises the steps that the grade of an along-line highway where a detected fabricated type bridge is located is classified; a first displacement sensor and a second displacement sensor are arranged on beam bottom midspan sections of a left side plate beam and aright side plate beam of a hinge joint to measure the absolute displacement of the adjacent plate beams; a U-shaped displacement sensor is arranged between the adjacent plate beams to measure the relative displacement of the adjacent plate beams; a hinge joint damage length ratio and a plate beam relative displacement ratio are calculated out through a hinge joint damage length calculating moduleand a plate beam relative displacement ratio calculating module correspondingly; and based on the grade of the along-line highway where the fabricated type bridge is located, by combining the calculating result of the hinge joint damage length ratio and the calculating result of the plate beam relative displacement ratio, fabricated type bridge hinge joint damage classification and grading evaluation is carried out through a hinge joint damage evaluation module. Hinge joint damage can be judged by the fabricated type bridge hinge joint damage classification and grading evaluation method and system without traffic interruption.

Description

technical field [0001] The invention belongs to the technical field of bridge structure evaluation, in particular to a method for classifying and grading evaluation of hinge joint damage of an assembled bridge and an evaluation system. Background technique [0002] Hinge joints are the weak link of hollow slab girder bridges. Once the early damage occurs, the performance will drop sharply, affecting the lateral force transmission characteristics of the bridge structure, weakening the overall mechanical performance of the structure, causing the single slab to be stressed, and directly affecting the safety of the structure. and service life. Regarding the determination of the health status of the hinged joint, the structure of the hinged joint is mainly detected by the load test method at present. The way of judging the damage of the hinged joint by the load test method is mainly to analyze the transverse distribution coefficient in detail to judge whether the transmitted shea...

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Problems solved by technology

The force transmission capacity index Λi of the hinge joint and the stiffness ratio index λi of the hinge joint are defined, and a corresponding method for judging the damage degree of the hinge joint is proposed, which requires a lot of manpower and material resources based on the load test; Zhang Shuwen. Research on the non-contact detection method (J). Low Temperature Building Technology, 2017,39(10):87-89. Using the ratio of the relative displacement of the plate girder to the displacement of the hollow plate as the evaluation index, the test and analysis of the situation without interrupting the traffic The displacement of each point adjacent to the hinge joint of the hollow slab girder of a real bridge, and the damage assessment of the hinge joint, but this method only considers the displacement change caused by the hinge joint damage as the evaluation standard, and cannot accurately reflect the actual damage of the hinge joint. Happening

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