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Beam bridge damage assessment early-warning method and early-warning system based on crack development height

A technology of crack height and crack development, applied in the direction of strength characteristics, using stable bending force to test the strength of materials, measuring devices, etc. problems, to achieve the effect of intuitive monitoring content, accurate detection results, and prevention of vicious accidents

Inactive Publication Date: 2013-07-31
CHANGAN UNIV
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Problems solved by technology

[0004] However, due to the limitation of funds and personnel, most of the conventional medium and small span beam bridges do not have safety monitoring and early warning systems.
At present, the routine inspection measures for small and medium-sized bridges are basically based on regular manual inspection. This passive inspection method can only make judgments on obvious bridge problems, and it is difficult to determine the overall health status of the bridge and the development of damage, and it does not have real-time and continuity, let alone early warning of bridge damage

Method used

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  • Beam bridge damage assessment early-warning method and early-warning system based on crack development height
  • Beam bridge damage assessment early-warning method and early-warning system based on crack development height
  • Beam bridge damage assessment early-warning method and early-warning system based on crack development height

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Embodiment 1

[0067] The girder bridge of this embodiment is: a certain bridge on National Highway 309, which was opened to traffic in 1975. The total length of the bridge is 160 meters. The diameter is 20 meters, the calculated span is 19.60 meters, and the total length of the main beam is 20 meters.

[0068] After visual inspection, it is found that the main girder defects are mainly manifested as: the web concrete cracks of the main girder, and the distribution of cracks in the beams of the whole bridge is similar. The 1 / 4 span area from the beam end is dominated by oblique cracks, and 8 The span section is dominated by reticular cracks, and the mid-span area is dominated by vertical cracks with a high distribution density, generally extending to 1 / 2 the beam height, and the mid-span cracks extend to the upper edge of the web, and the highest three cracks are evenly distributed. 1.1 meters high.

[0069] The relationship between bending moment and crack height of the middle girder of th...

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Abstract

The invention relates to a beam bridge damage assessment early-warning method and an early-warning system based on a crack development height. According to the early-warning method, early warning is carried out when a crack in a main beam of the beam bridge requiring monitoring develops to a dangerous crack height range of a main beam mid-span cross section. The main beam mid-span cross section dangerous crack height range is provided according to a main beam resistance designed value and a main beam resistance standard value, and is determined according to a bending moment-crack height diagram of the main beam mid-span cross section. The bending moment-crack height diagram is obtained according to a cross section non-linear whole process analysis upon the bridge cross section. The early-warning system comprises conductive coatings coated on dangerous crack height ranges of various main beam mid-span cross sections of the beam bridge, and a data processing and early-warning device. The data processing and early-warning device comprises a data acquisition device, a microprocessor, and a GMS short message module. When a crack on the monitored beam bridge main beam develops to a dangerous crack height range, the system carries out early warning with a form of short messages.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a beam bridge damage assessment and early warning method and early warning system based on the crack development height. Background technique [0002] The large-scale investment and long service period of bridge projects are the key nodes of traffic lines. Due to the coupling of unfavorable factors such as quality defects, load effects, environmental erosion, material aging, natural disasters and man-made disasters, it will inevitably lead to structural damage accumulation, resistance attenuation and functional degradation, so that the safety, applicability and quality of the bridge will be reduced. Decreased durability, resulting in frequent maintenance and repairs and, in extreme cases, catastrophic accidents. [0003] In order to ensure the safety of the whole process of construction and operation of large bridges, strengthen the monitoring and evaluati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20G01N3/06
Inventor 梁鹏王旭王秀兰薛鹏涛
Owner CHANGAN UNIV
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