Measuring system and method for concrete stress distribution in steel pipe of arch bridge based on stepped section

A technology of stress distribution and measurement system, which is applied in the measurement of force, measurement device, and force measurement by measuring the change of optical properties of materials when they are stressed. Creep and other problems, to achieve the effect of improving measurement accuracy, increasing sensitivity, stress and stress distribution

Active Publication Date: 2020-11-03
GUANGXI UNIV +4
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the concrete in the steel tube concrete structure has the problem of shrinkage and creep after pouring. If there is too much shrinkage, it will cause the steel tube to separate from the concrete and affect the overall mechanical performance of the structure. It is necessary to measure the concrete inside the steel tube along the steel tube. Shrinkage performance

Method used

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  • Measuring system and method for concrete stress distribution in steel pipe of arch bridge based on stepped section
  • Measuring system and method for concrete stress distribution in steel pipe of arch bridge based on stepped section
  • Measuring system and method for concrete stress distribution in steel pipe of arch bridge based on stepped section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 with image 3, a system for measuring the stress distribution of concrete in a steel pipe of an arch bridge based on a stepped section, comprising a steel pipe 1 and concrete 2 poured into the steel pipe 1, wherein a plurality of steel bars 3 are fixed in the steel pipe 1 along the radial direction of the steel pipe 1, Adjacent steel bars 3 are provided with sensors 4 . The sensor 4 includes a stepped rod 41 , a sensitive element 42 fixed on the middle of the stepped rod 41 and a protective cover 43 arranged outside the stepped rod 41 . The sensitive element 42 may be a fiber Bragg grating or a resistance strain gauge, etc., and is preferably a fiber Bragg grating in this embodiment. Both ends of the ladder bar 41 are also fixedly provided with end plates 44, and the convex parts of the end plates 44 away from the ladder bar 41 are all connected with the concrete 2 (that is, the end plates 44 are embedded in the concrete 2, so that the force in the c...

Embodiment 2

[0052] In addition to the above-mentioned stepped rod 41, the sensor 4 may also include a constant-section rod 45 (that is, the sensor 4 is a combined sensor), and the two ends of the constant-section rod 45 are fixed on the end plate. 44 and spaced apart from the ladder bar 41 . In the concrete stress distribution measurement system in the steel pipe of the arch bridge based on the stepped section in this embodiment, the sensor 4 includes one equal-section rod 45, two ladder rods 41, and the equal-section rods 45 are arranged on two Between the said ladder bar 41 (as Figure 4 ). Of course, in other embodiments, the number of stepped rods 41 and equal-section rods 45 can also be appropriately increased by the length of the end plate 45 . That is, other structural forms with different cross-sectional areas may also be used in other embodiments. In addition, both ends of the sensor 4 are positioned by the sensor positioning member 5, so that the two ends of the sensor 4 are ...

Embodiment 3

[0060] In the concrete stress distribution measurement system in the steel pipe of the arch bridge based on the stepped section in this embodiment, there are two equal-section rods 45 arranged in the sensor 4, one stepped rod 41, and the stepped rod 41 is arranged on two equal-section rods 45 between (such as Figure 5 ). Others are the same as the measurement system of Embodiment 2.

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Abstract

The invention discloses a system for measuring concrete strain distribution in an arch bridge steel tube based on step cross section and a method, belonging to the technical field of concrete stress measurement. The system for measuring concrete strain distribution in the arch bridge steel tube based on step cross section comprises a steel tube and concrete in the steel tube, wherein a plurality of steel bars are fixedly arranged in the steel tube along a radial direction of the steel tube, the neighboring steel bars are provided with a sensor, the sensor comprises a step rod, a sensitive element fixedly arranged on a middle part of the step rod and a protective cover arranged at the outside of the step rod, two ends of the step rod are fixedly provided with end plates; convex parts, far away from the step rod, of the end plates are all connected with the concrete; two ends of the protective cover are respectively in fixed connection with the end plates on the two ends; and a sensor locating piece is also fixedly arranged on the steel bars. According to the system and the method provided by the invention, the sensor comprising different sections of step rods with different cross-sectional area is arranged, thus, a function of increasing sensitivity of the sensor in measurement or expanding measurement range of the sensor is realized.

Description

technical field [0001] The invention relates to the technical field of concrete stress measurement, in particular to a system and method for measuring the stress distribution of concrete in steel pipes of arch bridges based on stepped sections. Background technique [0002] After the concrete-filled steel tube structure is built, it will bear the dead load and live load, and the stress and stress distribution field will be generated in the structure. Usually, the stress and strain of CFST sections at different positions and different positions of the same section are not the same, and their magnitudes are often quite different. Stress is an important indicator for evaluating structural performance. In order to understand the stress state of the structure, it is often necessary to accurately measure the stress field of CFST. The stress field measurement of the steel tube concrete structure can be realized by laying sensors. The layout of the sensor requires accurate positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/20G01L1/24
CPCG01L1/205G01L1/247
Inventor 邓年春王奭王睿陈克坚郭晓魏志强王勇戴胜勇胡华万石拓李颢旭徐登元吴春成李恒陈建峰强新刚
Owner GUANGXI UNIV
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