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Method for identifying bridge deflection based on long gauge length strain improved bending moment area method

A bridge deflection and long gauge length technology, which is used in elastic testing, machine/structural component testing, measuring devices, etc., can solve the problem of needing a reference point to measure bridge deflection, and achieve good stability, ease of use, and measurement accuracy. high effect

Active Publication Date: 2019-11-22
扬州市市政建设处 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies in the prior art, and proposes a method for identifying bridge deflection based on the improved moment area method based on long gauge strain, which solves the problem that reference points are needed for measuring bridge deflection in the prior art

Method used

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  • Method for identifying bridge deflection based on long gauge length strain improved bending moment area method
  • Method for identifying bridge deflection based on long gauge length strain improved bending moment area method
  • Method for identifying bridge deflection based on long gauge length strain improved bending moment area method

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Embodiment

[0082] Next, use the above method to invert the deflection of the I-shaped steel beam. Set up an I-shaped simply supported steel beam with a length of 8m. A two-axle vehicle load is applied to the beam, the weight of the front and rear axles of the vehicle load is 5000N, and the wheelbase is 0.4m. A total of 2 loading conditions are set, denoted as working condition D1 and working condition D2. D1 means that the trolley is stationary at the mid-span position of the I-shaped steel beam, and D2 is that the trolley passes through the entire I-shaped steel beam at a speed of 18km / h. .

[0083] Figure 4 (a) is the deflection distribution of simply supported beam along the beam length under static load; Figure 4 (b) is the time-varying deflection distribution at the mid-span position of a simply supported beam. The real value refers to the deflection value directly extracted from the finite element, and the calculated value refers to the deflection value calculated according to...

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Abstract

The invention discloses a method for identifying bridge deflection based on a long gauge length strain improved bending moment area method. The method comprises the following steps of: S1, determininga bridge length L and a bridge cross section neutral axis height h; S2, continuously arranging m long-gauge-length strain sensors on the bridge in the length direction, and testing long-gauge-lengthstrain measured by each long-gauge-length strain sensor under the action of any load; S3, obtaining a function relationship between deflection and strain by adopting an improved bending moment area method; and S4, calculating the deflection of a point x at the moment t on the bridge according to the function relationship between the deflection and the strain. Based on an improved bending moment area method, the function relationship between the deflection and the strain can be deduced. Deflection distribution of any point on the structure along with time change and deflection distribution of the structure at any moment can be obtained through a formula in combination with the measured strain. The method is not affected by external loads, is suitable for static loads and dynamic loads, andis high in measurement precision, good in stability and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of engineering monitoring, and in particular relates to a bridge deflection identification method based on an improved bending moment area method based on long gauge strain. Background technique [0002] With the rapid development of society and the continuous progress of science and technology, my country has made great progress in bridge construction. There are more than 600,000 bridges in the country. Due to the influence of uncertain factors, improper maintenance measures after completion, natural aging of materials, overweight vehicles and accidental loads, nearly 1 / 4 of the bridges have hidden dangers such as defects, damages and functional failures of varying degrees. The safety performance and normal function of the bridge are reduced, leading to catastrophic accidents. [0003] The continuous occurrence of bridge safety accidents makes the structural health monitoring of bridges an essential work. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00
CPCG01M5/0008
Inventor 沈国根陈寅磊洪万唐永圣
Owner 扬州市市政建设处
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