Pull-out test device for bond-slip hysteretic behavior testing of stiffening rib

A technique for pulling out tests and reinforcing ribs, which is applied in the direction of measuring devices, using mechanical devices, and using repeated force/pulsation force to test the strength of materials, etc., which can solve the inaccurate bond-slip hysteresis relationship and bond failure form influence and other issues, to achieve the effect of maintaining a consistent stress state

Active Publication Date: 2016-10-12
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This stress state is inconsistent with the real situation, and the compressive stress on the concrete will affect the bond failure mode, resulting in an inaccurate bond-slip hysteresis relationship

Method used

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  • Pull-out test device for bond-slip hysteretic behavior testing of stiffening rib
  • Pull-out test device for bond-slip hysteretic behavior testing of stiffening rib
  • Pull-out test device for bond-slip hysteretic behavior testing of stiffening rib

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Embodiment Construction

[0022] A pull-out test device suitable for testing the bond-slip hysteretic performance of reinforced bars, including a reaction frame 1, a fastening steel plate 2, an upper clamping device 3, and a pull-out test piece 14 (Fig. 8(a) and Fig. 8 (b) is a side view and a top view of the pull test piece 14), the overall structure schematic diagram of the present invention is as figure 1 shown.

[0023] The reaction force frame 1 includes a frame top plate 4 , two frame side plates 5 and a frame bottom plate 6 . Three rows of threaded holes 8 and rectangular slots 9 are distributed on the frame top plate 4 . Three rows of threaded holes 8 and circular slots 11 are distributed on the frame bottom plate 6. The rectangular slots 9 and the circular slots 11 are located on the same center line. The frame side plate 5 is a cuboid with grooves and threaded holes 8 . The connecting piece 7 passes through the circular slot 11 of the frame bottom plate 4 and is screwed and fixedly connect...

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Abstract

The invention belongs to the field of civil and structural engineering, and relates to a pull-out test device for bond-slip hysteretic behavior testing of a stiffening rib. The pull-out test device comprises a counter-force frame, a fastening steel plate, an upper clamping device and a pull-out test piece, wherein the counter-force frame is formed through fixed connection of a top plate, side plates and a bottom plate through bolts, and the counter-force frame is fixedly connected with a tester base through a connecting part; the fastening steel plate and the pull-out test piece are pressed through a bolt; the upper portion of a deformed steel bar shaft in the upper clamping device is in spiral connection with a load sensor of a tester, the lower portion of the deformed steel bar shaft is in spiral connection with the inner side of the upper portion of a steel sleeve and rotates in the thread direction to enable the steel sleeve to rise and fall, and the lower portion of the steel sleeve is connected with the end of the stiffening rib. The pull-out test device is simple in structure. During cycling load application, static balancing is maintained between the test piece and the counter-force frame, and relative displacement is avoided; the stiffening rib and concrete have the same stress state.

Description

technical field [0001] The invention belongs to the field of civil engineering and structural engineering, and relates to a pull-out test device suitable for testing the bonding-slip hysteretic performance of reinforcing bars. Background technique [0002] Due to its good tensile properties, reinforced bars (including steel bars, steel strands, and fiber-reinforced composite bars, etc.) are widely used in concrete structural engineering. Reinforcing bars are mainly arranged in the tension area of ​​structures or components to make up for the shortcomings of insufficient tensile strength of concrete. When the concrete structure is loaded, the internal force generated by the external load is first applied to the concrete, and then transmitted to the reinforced reinforcement. The key to ensure the transmission of internal force is the bonding between the reinforcement and the concrete. Therefore, strengthening the bonding performance of reinforcement and concrete is a basic pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N3/32
CPCG01N3/32G01N19/04G01N2203/0005
Inventor 张学李芦钰吕昌明吴智敏欧进萍
Owner DALIAN UNIV OF TECH
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