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Method for health diagnosis of concrete bridge structure based on statistical indexes

A bridge structure and statistical index technology, applied in the testing of machines/structural components, elastic testing, measuring devices, etc., can solve problems such as difficulty in working and establishing accurate models, and achieve the effect of avoiding storage

Inactive Publication Date: 2010-04-21
CHONGQING JIAOTONG UNIVERSITY +1
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Problems solved by technology

Due to the lack of old bridge data and the change of bridge structural parameters, it is very difficult to establish an accurate model, and the unknown environmental incentives in monitoring make this type of method difficult to work

Method used

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  • Method for health diagnosis of concrete bridge structure based on statistical indexes
  • Method for health diagnosis of concrete bridge structure based on statistical indexes
  • Method for health diagnosis of concrete bridge structure based on statistical indexes

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Experimental program
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Embodiment

[0107] see figure 1 , figure 2 , figure 1 Shown is the deflection value curve of a bridge in a certain period of time (period 1), with days as the calculation period, figure 2 for with figure 1 The maximum and minimum value curves of deflection in the same cycle, based on the deflection value curve, calculate various indicators according to the above method, and draw them into a chart, that is, image 3 .

[0108] image 3 for with figure 1 , figure 2 ADX curve and DMA, AMA curve in the same period. From image 3 It can be seen that when the bridge is healthy, the DMA and AMA curves fluctuate around the 0-value line (that is, the abscissa axis) in a narrow horizontal range (fluctuation range is less than 2), and the ADX value is below 40.

[0109] Figure 4 is the deflection value curve of another time period (period 2), with weeks as the calculation period; Figure 5 for with Figure 4 ADX curve in the same period, Figure 6 For the corresponding TRIX, TRMA cu...

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Abstract

The invention discloses a method for the health diagnosis of a concrete bridge structure based on statistical indexes, which comprises the following steps of: for each flexibility measurement point, only retaining four data of a maximum value, a minimum value, a starting value and a finishing value of monitoring data every day and calculating an ADX index, a DMA index and a TRIX index according to the retained data; (1) describing the current deterioration trend of the bridge structure by adopting the ADX index; (2) describing the intermediate-term and short-term deterioration trends of the bridge structure by adopting the DMA index; (3) describing the long-term deterioration trend of the bridge structure by adopting the TRIX index; and (4) according to the calculation result of the three statistical indexes, obtaining an ADX index value, a DMA index value, an AMA index value, a TRIX index value and a TRMA index value, drawing the combination of various index values into a structure safety evaluation diagram on the same coordinate system and carrying out comprehensive evaluation on the health state of the bridge structure. The invention has the advantages of providing a method for the non-model evaluation of the safety of the bridge structure and avoiding the storage and processing of mass data.

Description

technical field [0001] The invention relates to a bridge structure safety evaluation technology, in particular to a method for health diagnosis of concrete bridge structures based on statistical indicators. Background technique [0002] Structural health monitoring, as an emerging technology to replace traditional bridge safety inspection and assessment, has received widespread attention and made some progress. However, structural health diagnosis, one of its cores, still mostly adopts methods that rely on accurate models of structures and known excitations. Due to the lack of old bridge data and the change of bridge structural parameters, it is very difficult to establish an accurate model, and the unknown environmental excitation in monitoring makes this kind of method difficult to work. Model-free evaluation methods have gradually attracted the attention of scholars in recent years. Contents of the invention [0003] The present invention proposes a method for health ...

Claims

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Application Information

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IPC IPC(8): G01M19/00G01M5/00G01M99/00
Inventor 周建庭梁宗保岳军声曹阳冉仕平田金昌
Owner CHONGQING JIAOTONG UNIVERSITY
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