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Bridge structure monitoring and evaluating method based on dynamic deflection attenuation rule

A bridge structure and bridge technology, applied in the field of bridge structure monitoring and evaluation, can solve problems such as inconvenient operation and complicated process, and achieve the effect of improving processing efficiency

Active Publication Date: 2019-08-16
山东省建筑科学研究院有限公司 +1
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of complex process and inconvenient operation in the existing bridge structure monitoring and life evaluation, and propose a bridge structure monitoring and evaluation method based on the law of dynamic deflection attenuation. Monitoring and Evaluation Method of Structural Life

Method used

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  • Bridge structure monitoring and evaluating method based on dynamic deflection attenuation rule
  • Bridge structure monitoring and evaluating method based on dynamic deflection attenuation rule
  • Bridge structure monitoring and evaluating method based on dynamic deflection attenuation rule

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Embodiment Construction

[0025] In the absence of natural disasters such as earthquakes and floods, the life cycle of concrete girder bridges is mainly the process of bridge fatigue damage and failure caused by vehicle loads. The reduction or failure of the durability of concrete bridge structures only accelerates the development of this process. , which is similar to the fatigue test process of prestressed concrete beams and reinforced concrete beams. The overloaded vehicle load is the fatigue load. The overloaded vehicle load of a large tonnage is equivalent to the upper limit of the fatigue load, and the overloaded vehicle load of a small tonnage is equivalent to the lower limit of the fatigue load. Therefore, the stiffness degradation trend of the main girder under the frequent passage of overweight vehicles (fatigue load) can refer to the stiffness attenuation model obtained from the fatigue test of concrete beams.

[0026] Such as figure 1 As shown, the section stiffness En / E0, that is, the curv...

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Abstract

The invention discloses a bridge structure monitoring and evaluating method based on a dynamic deflection attenuation rule. In a monitoring period, a deflection sensor is adopted to collect a midspandeflection change parameter at a specified position of a monitored bridge, and meanwhile, a video shooting device acquires images of vehicles which pass through the bridge; and parameters, the midspandeflection of which exceed a set threshold value, are selected from the bridge monitoring data, and meanwhile, an image automatic or manual recognition method is adopted to screen out loaded vehicleimages of the same specific type from the vehicle images, a sequence value of the sampling deflection which is changed along with the time is obtained, and linear fitting is carried out through a least square method, so that the bridge dynamic deflection and the attenuation rate coefficient of structural rigidity are obtained, and the bridge life prediction is realized. The method has the scientific rationality, is simple and feasible, is convenient to implement, and has important significance for bridge evaluation.

Description

technical field [0001] The invention belongs to the technical field of bridge maintenance, and in particular relates to a monitoring and evaluation method for bridge structures based on dynamic deflection attenuation laws. Background technique [0002] Bridges play an important role in road transportation and the development of the national economy. With the development of the economy and the development of the logistics industry, the road traffic volume has increased sharply, and the phenomenon of overloaded vehicles crossing the bridge has become increasingly serious. Excessive traffic volume and bridge load capacity Heavy overloaded vehicles on the bridge will cause serious damage to the bridge components and affect the safe operation of the bridge structure. This has a major impact on the maintenance and management of the bridge, and even causes major safety accidents such as bridge collapse. [0003] In order to ensure the safety of bridge operation, it is necessary to ...

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Application Information

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IPC IPC(8): G01M5/00
CPCG01M5/0008G01M5/005
Inventor 刘治刘恒刘近龙郭延飞蔡玉鹏马超连峰李乾龙张广龙陈路滨胡现虎徐光铭时彦宁李杰
Owner 山东省建筑科学研究院有限公司
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