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Test method for measuring bond stress between reinforcing steel bars and concrete

A technology of bonding stress and test method, which is applied in the field of mechanical tests, can solve the problems of test result distortion, large damage to steel bars, and high waste chip rate, and achieve the effects of convenient waterproof and moisture-proof treatment, simple test method, and low waste chip rate

Active Publication Date: 2011-10-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0006] (1) The test method of cutting the steel bar and milling the groove through the length is adopted, the test workload is large, and the test piece preparation period is long
Moreover, the cost is too high, which is not conducive to the promotion of large-scale experiments;
[0007] (2) Cutting the steel bar and milling the groove will cause great damage to the steel bar itself, resulting in a large change in the performance of the steel bar itself, and the test results may be distorted, and this method can only be applied to thicker steel bars, and thin steel bars cannot be used at all;
[0008] (3) Due to the large wound surface of the steel bars, it is difficult to waterproof and moisture-proof the strain gauges when the steel bars are spliced ​​together, and the waste rate in previous tests is high

Method used

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  • Test method for measuring bond stress between reinforcing steel bars and concrete
  • Test method for measuring bond stress between reinforcing steel bars and concrete
  • Test method for measuring bond stress between reinforcing steel bars and concrete

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Embodiment Construction

[0029] The specimens prepared according to this test method are as follows: figure 1 shown. The concrete test block 3 contains a foil strain gauge 1 , a slotted steel bar 2 , a plastic flexible conduit 4 , a strain gauge wire 5 , and a plastic flexible sleeve 6 . The most important part is the pasting and preparation of slotted steel bars 2 and foil strain gauges 1, such as Figure 3-5 shown. The technical requirements in the preparation process are detailed below:

[0030] (1) Rebar slotting: see Figure 2 ~ Figure 4 The steel bars are grooved longitudinally along the surface by a milling machine to ensure accuracy. The groove depth is 2.5mm and the groove width is 5mm. ). For light round steel bars and deformed steel bars with regular circumference, grooves can be made at any position, and for crescent rib steel bars, grooves should be made on the longitudinal ribs to reduce damage to the surface of the steel bars;

[0031] (2) Foil-attached strain gauges: Foil-type st...

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Abstract

The invention discloses a test method for measuring bond stress between reinforcing steel bars and concrete. A groove is formed longitudinally along the surface of the reinforcing steel bars, and a foil strain gauge is embedded into the groove to fulfill the aim of measuring the stress of the reinforcing steel bars distributed along the embedded length. The test method has the advantages of simpleness, convenience, quickness, labor saving and cost saving for manufacturing of test pieces, convenient waterproof and moistureproof treatment, low rate of waste pieces, small damage to the reinforcing steel bars, and suitability for manufacturing test pieces for large-scale tests and the like, and is easy to popularize to the field of experimental study on reinforced concrete structures.

Description

technical field [0001] The invention relates to a test method capable of measuring the distribution of bonding stress along the buried length of steel bars, in particular to a test for testing the bond-slip performance between steel bars and concrete using a pull-out test, and belongs to the technical field of mechanical tests. Background technique [0002] The bond between steel bar and concrete is a complex interaction between steel bar and concrete. This action is used to transfer the stress between the two to ensure the coordinated work of steel bar and concrete. This effect is essentially the shear stress along the longitudinal direction of the steel bar produced on the contact surface between the steel bar and the concrete, that is, the bond stress. The bonding problem is an important physical and mechanical property of reinforced concrete. For reinforced concrete structures, the bonding performance between steel bars and concrete is the theoretical basis for the stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/04
Inventor 白国良李晓文吴淑海柴园园
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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