A beam bridge safety monitoring and evaluating device

A technology for safety monitoring and evaluation devices, which is applied in the direction of measuring devices, special data processing applications, instruments, etc., can solve the problems of damage recognition rate, low spatial resolution, and inability to accurately reflect the structural state, so as to improve accuracy, Effects of reduced noise and excellent indication performance

Active Publication Date: 2019-04-26
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the traditional strain gauge monitors the strain of structural points, and the spatial resolution is too low, resulting in insufficient damage recognition rate. At the same time, due to the influence of noise and ambient temperature, the strain signal will drift with time, so the traditional monitoring method is not very accurate. reflect the structural state of the design

Method used

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  • A beam bridge safety monitoring and evaluating device
  • A beam bridge safety monitoring and evaluating device
  • A beam bridge safety monitoring and evaluating device

Examples

Experimental program
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Embodiment 1

[0040] figure 1 It is a structural block diagram of the girder bridge safety monitoring and evaluation device of the present invention.

[0041] Such as figure 1 As shown, the girder bridge safety monitoring and evaluation device 100 of the present invention is used to monitor the dynamic strain information of the girder bridge and evaluate whether the structure of the bridge is safe, including a strain information collection device 10 and a strain information management device 20 . Wherein, the strain information management device 20 is connected to the strain information collection device 10 through a wireless communication network (such as Wifi).

[0042] In Example 1, the bridge to be tested is a prestressed concrete box girder bridge, and the span composition is 32+32+37+32m.

[0043] figure 2 is a structural block diagram of the strain information acquisition device of the present invention, image 3 is a structural schematic diagram of the dynamic strain gauge of the...

Embodiment 2

[0097] In this second embodiment, the same symbols are assigned to the same structures and conditions as those of the first embodiment, and the same descriptions are omitted.

[0098] In Embodiment 2, the structure and work flow of the girder bridge safety monitoring and evaluation device 100 are the same as in Embodiment 1, but the number of dynamic strain gauges on the same monitoring section, the structure of the strain distribution calculation unit, and the calculation method of the neutral axis index are different. different, specifically:

[0099] The bridge to be tested is a prestressed concrete box girder bridge with a span composition of 32+32+37+32m. 4, 6, and 4 dynamic strain measuring points are set at the 1 / 4 span, 1 / 2 span, and 3 / 4 span of the fourth hole of the bridge, which are laid on the web plates on both sides of the box girder structure.

[0100] The strain distribution calculation unit 204 includes a dynamic strain gauge position acquisition unit 204a, a...

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Abstract

The invention provides a beam bridge safety monitoring and evaluation system, which is used for monitoring dynamic strain information on a plurality of monitoring sections of a bridge and evaluating whether the structure of the bridge is safe or not, and is characterized by comprising a strain information acquisition device havingdynamic strain gauge for acquiring the dynamic strain information; astrain information acquisition device which comprises an acquisition side communication part used for sending dynamic strain information to the strain information management device, and the strain information management device comprises a strain information processing part used for obtaining a strain response curve of the dynamic strain information; A threshold value storage unit in which a threshold value interval is stored; The response amplitude acquisition part is used for acquiring the strain response amplitude of the acquisition channel; The strain distribution calculation part is usedfor calculating to obtain strain distribution on the monitored cross section; The safety index calculation part is used for calculating a neutral axis index; And the structure safety judgment part isused for judging whether the structure of the bridge is safe.

Description

technical field [0001] The invention relates to the field of structural safety monitoring, in particular to a girder bridge safety monitoring and evaluation device. Background technique [0002] my country is the country with the largest number of highway bridges in the world. According to the statistical information of the Ministry of Transport, by the end of 2016, there were 805,300 highway bridges in my country, with a cumulative length of 49.1697 million linear meters. The girder bridge occupies an unshakable main position in the highway bridge. With the increase of bridge service life, a large number of newly built bridges are gradually entering the "aging" stage, and various forms of structural degradation inevitably occur. It can be seen that it is urgent to carry out research on safety monitoring of girder bridges under operating conditions. By selecting reasonable and common safety indicators for long-term monitoring, the structural degradation process of the tar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01B21/32
CPCG01B21/32G06F30/13G06F2119/06
Inventor 夏烨淡丹辉孙利民
Owner TONGJI UNIV
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