Bridge structure monitoring and evaluation method based on stiffness attenuation law of main beam

A bridge structure and stiffness 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 convenient implementation and improved 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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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of complex process and inconvenient operation existing in the existing bridge structure monitoring and life evaluation, and propose a bridge structure monitoring and evaluation method based on the stiffness attenuation law of the main girder. Through a simple and scientific algorithm, the Monitoring and Evaluation Method of Bridge Structure Life

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  • Bridge structure monitoring and evaluation method based on stiffness attenuation law of main beam
  • Bridge structure monitoring and evaluation method based on stiffness attenuation law of main beam
  • Bridge structure monitoring and evaluation method based on stiffness attenuation law of main beam

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Embodiment Construction

[0030] 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.

[0031] Such as figure 1 As shown, the section stiffness En / E0, that is, the curv...

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Abstract

The present invention discloses a bridge structure monitoring and evaluation method based on the stiffness attenuation law of the main beam. The method comprises: in a monitoring period, using a deflection sensor to collect mid-span deflection-varying parameters at a designated position of a monitored bridge, and obtaining the truck weight by using a vehicle dynamic weighing system; in the bridgemonitoring data, selecting the parameter of the mid-span deflection exceeding the set threshold and the truck weight exceeding a certain threshold; through the time correlation between the deflectionsensor and the vehicle dynamic weighing system, obtaining a sequence value of the sampling deflection changing with the time and the overloaded vehicle weight sequence value; and through linear fitting by using the least squares method, obtaining the attenuation rate coefficient of the bridge structure stiffness so as to realize the prediction of the bridge life. The method provided by the presentinvention is scientific and reasonable, simple and feasible, and convenient to be implemented, and is of great significance for the bridge evaluation.

Description

technical field [0001] The invention belongs to the technical field of bridge maintenance, and in particular relates to a bridge structure monitoring and evaluation method based on the attenuation law of main girder stiffness. 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...

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Application Information

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Patent Type & Authority Applications(China)
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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