Deck arch bridge data acquisition system and deformation distribution identification method and equipment

A data acquisition system and deformation distribution technology, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of the influence of measurement accuracy and the inability to meet the needs of deflection measurement.

Inactive Publication Date: 2019-01-04
SICHUAN AGRI UNIV
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  • Abstract
  • Description
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Problems solved by technology

The deflection and deformation of the arch bridge need to be strictly controlled, but its measurement accuracy will still be affected by various factors during the re

Method used

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  • Deck arch bridge data acquisition system and deformation distribution identification method and equipment
  • Deck arch bridge data acquisition system and deformation distribution identification method and equipment
  • Deck arch bridge data acquisition system and deformation distribution identification method and equipment

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Embodiment 1

[0112] as Figure 5 The finite element model of an overhead arch bridge is shown as an example. The bridge is 25 meters wide, the span of the arch ring is 112 meters, the inner rise height of the facade is 24 meters, and the rise-span ratio is 1 / 5. The section of the arch ring is I-shaped, with a section height of 2 meters and a width of 8 meters. The material is C40 concrete, and the elastic modulus is 3.2599+010n / m2. The arch circle is divided into 56 units, connected by 56 units and 57 nodes, and each unit is 2 meters long. The finite element analysis software is used to verify the identification of the present invention under various load conditions, and the coupling strain of the characteristic section of the arch unit of each working condition is extracted under 10% white noise, and the deformation distribution of the upper-supported arch bridge is calculated by the method of the present invention.

[0113] According to the method to be disclosed, the deformation distr...

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Abstract

The invention discloses a deck arch bridge data acquisition system and deformation distribution identification method and equipment. The data acquisition system includes long gauge length FBG sensors.The sensors are arranged near four division points of an arch ring structure along the length direction of a bridge and the tops and bottoms of arch ring sections near a structural column and two columns. The identification method is based on the data acquisition system, processes acquired sensor data, separates monitored coupling strain data, and finally identifies deformation distribution of the arch bridge by a curvature load method. According to the invention, a sensor arrangement scheme is determined according to strain distribution characteristics of the unit sections and longitudinal unit of the bridge to realize effective distribution monitoring of the arch bridge. Meanwhile, the arch bridge deformation distribution identification method based on curvature change is established through complex stress analysis of the arch bridge, which can effectively and quickly complete a deformation monitoring task of a long-span deck arch bridge, is expected to be applied to engineering practice, and can bring huge economic and social benefits.

Description

technical field [0001] The invention relates to the field of bridge monitoring, in particular to a data acquisition system, a deformation distribution identification method and equipment of an upwardly supported arch bridge, which can realize deformation distribution identification of an upwardly supported arch bridge under complex stress. Background technique [0002] Bridge deflection is an important indicator of bridge safety evaluation. At present, the methods used to measure bridge deflection mainly include direct measurement methods using monitoring equipment such as total stations, GPS, and cable displacement meters, but such methods are greatly affected by factors such as geographical location and climate. Taking GPS technology as an example, although this technology has the advantages of high efficiency, automation, high precision and all-weather operation, it is limited by many factors such as sampling frequency, satellite coverage, environmental conditions and dat...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/165
Inventor 张青青孙童非魏召兰刘乾龙汪静
Owner SICHUAN AGRI UNIV
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