In-service structure prestress detection method based on resistance strain effect

A technology of resistance strain and detection method, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of high cost, detection method not suitable for in-service structure, low signal-to-noise ratio, etc.

Active Publication Date: 2021-07-06
CHONGQING JIAOTONG UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, although there are many researches on effective prestress detection of structures, most of the detection methods proposed are not suitable for in-service structures, and the few methods that can be used for effective prestress detection of in-service structures have low ac

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  • In-service structure prestress detection method based on resistance strain effect
  • In-service structure prestress detection method based on resistance strain effect
  • In-service structure prestress detection method based on resistance strain effect

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Embodiment 1

[0034] This embodiment discloses a method for detecting the prestress of an in-service structure based on the resistance strain effect.

[0035] Such as figure 1 and figure 2 As shown, a prestress detection method for in-service structures based on the resistance strain effect includes the following steps:

[0036] S01: Obtain the resistivity of the prestressed steel strand of the prestressed concrete structure under effective prestress;

[0037] S02: Calculate the original resistance of the prestressed steel strand according to the resistivity of the prestressed steel strand, its design length and the strain under the design tension;

[0038] S03: Measure the actual resistance of the prestressed steel strand under effective prestress;

[0039] S04: Calculate the effective prestress of the prestressed steel strand according to the original resistance of the prestressed steel strand, the actual resistance under the effective prestress, and the corresponding relationship bet...

Embodiment 2

[0061] On the basis of the first embodiment, this embodiment discloses a resistance testing device that implements the four-terminal method for measuring resistance.

[0062] The resistance testing device in this embodiment is used to implement the four-terminal method for measuring resistance. combine Figure 4 As shown, the resistance testing device includes a constant source current power supply and an ammeter which are arranged in series with each other and form a current path in series with the steel strand under test during measurement, and are connected with the steel strand under test during measurement and are connected to the constant source current power supply and the The ammeter is arranged in parallel with the voltmeter. Specifically, the terminal of the voltmeter on the steel strand to be tested should be inside the terminal of the ammeter. combine figure 2 and image 3 As shown, the constant source current power supply, ammeter and voltmeter are all connec...

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Abstract

,The invention relates to the technical field of prestress detection, in particular to an in-service structure prestress detection method based on a resistance strain effect. The method comprises the steps of obtaining the resistivity of a prestressed steel strand of a prestressed concrete structure under effective prestress, calculating the original resistance of the prestressed steel strand according to the resistivity of the prestressed steel strand, the design length of the prestressed steel strand and the strain under the design tension; measuring the actual resistance of the prestressed steel strand under the effective prestress, and calculating the effective prestress of the prestressed steel strand according to the original resistance of the prestressed steel strand, the actual resistance under the effective prestress, and the corresponding relation between the resistance and the strain and the corresponding relation between the strain and the stress. According to the in-service structure prestress detection method based on the prestress steel strand resistance strain effect, effective prestress nondestructive detection of an in-service prestress concrete structure can be achieved, and the prestress detection precision can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of prestress detection, in particular to an in-service structure prestress detection method based on the resistance strain effect. Background technique [0002] In the field of civil engineering, prestressed concrete structures have been widely used. Among them, the prestressed steel strand is the key stress member of the prestressed concrete structure, and its health directly affects the durability and safety of the structure. During the construction and operation phase of the bridge, affected by factors such as material performance, construction status and environmental conditions, the prestressed concrete structure will produce prestress loss, which will reduce the prestress level of the structure and uneven distribution of prestress, which will affect the working performance of the structure. Once the prestressed concrete structure fails, it will bring huge safety hazards to the structure. Therefore, i...

Claims

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Application Information

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IPC IPC(8): G01L1/22
CPCG01L1/22
Inventor 廖棱张向和周建庭张森华张洪杨宏赵瑞强刘惠玲尹昌华
Owner CHONGQING JIAOTONG UNIVERSITY
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