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Clamping device and method for anti-eccentric loading of double-shearing experiment

A technology of eccentric loading and clamping devices, which is applied to measuring devices, using stable shear force to test the strength of materials, instruments, etc., can solve the problems of eccentric bending moment, easy to generate torque, misalignment of test pieces, etc., and achieve reduction Effects of size, space saving, and loading space saving

Inactive Publication Date: 2018-03-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the interface between reinforced material / component and concrete and other similar double shear experiments, in order to solve the problem of easy to generate torque when the specimen is clamped and the eccentric bending moment caused by misalignment of the specimen, the experimental object (such as reinforced material / component and concrete The interface) is in a pure shear loading state, and the invention provides a double shear experiment anti-eccentric loading clamping method and device

Method used

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  • Clamping device and method for anti-eccentric loading of double-shearing experiment
  • Clamping device and method for anti-eccentric loading of double-shearing experiment
  • Clamping device and method for anti-eccentric loading of double-shearing experiment

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Embodiment 1

[0036] Such as Figure 1 to Figure 7 As shown, a double shear experiment anti-eccentric loading clamping device is used in the double shear experiment of the FRP-concrete interface under static load and fatigue load, and is connected between the testing machine and the threaded rods at the upper and lower ends of the concrete specimen. During the period, in order to eliminate the adverse effects of the torque and eccentric bending moment on the specimen during the installation and clamping process, a clamping device connected to both ends of the specimen 6 was adopted, including two combined loading heads with the same structure. The combined loading head includes a fork fixture 1, a suspension ring 2, and a pin connection device. One end of the fork fixture 1 is provided with a straight rod part clamped by the testing machine, and the other end is centered along the axis of the fork fixture 1. An open slot matching the shape of the suspension ring is provided, and one end of ...

Embodiment 2

[0071] In this embodiment, a clamping method for anti-eccentric loading in a double shear experiment based on the device,

[0072] Include the following steps:

[0073] 1) Make a double-shear test piece, and process the external thread at the leaky end of the ribbed steel bar that will be pre-embedded in test piece 6 for loading. The length of the external thread is ≥ 5d, and d is the diameter of the steel bar. The end of the steel bar for processing the external thread is closed; prevent the mortar from filling the thread in the process of making the test piece, and at the same time prevent the steel bar from rusting and making it difficult to connect.

[0074] 2) Connect the lifting ring with the test piece. After the double-shear test piece is made, remove the scotch tape at the end of the steel bar, clean it up, and screw the lifting ring into the external threaded part of the steel bar end at both ends of the test piece to realize When connecting with the test piece, pay...

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Abstract

The invention discloses a clamping device for anti-eccentric loading of double-shearing experiment. The clamping device comprises two combined loading heads with the same structure, and each combinedloading head comprises a fork clamp, a flying ring and a bolt pin connecting device, wherein a straight bar part clamped by a tester is arranged at one end of the fork clamp, an open slot is formed inthe center of the other end of the fork clamp along the axis of the fork clamp, one end of the flying ring is coaxially hinged into the open slot of the fork clamp by the bolt pin connecting device vertically running through the fork clamp, and a threaded hole is formed in the other end of the flying ring. The invention also discloses a clamping method for anti-eccentric loading of double-shearing experiment. The clamping device and the clamping method disclosed by the invention can automatically counteract torque caused by clamping a test piece with the tester while the test piece is installed, balance bending moment caused by manufacture error, and prevent the test piece from being twisted and / or being bent due to eccentric action, so as to eliminate the influence of eccentric loading to result of intra-surface loading experiment, ensure a pure shearing loading state and realize pure double-shearing experiment.

Description

technical field [0001] The invention belongs to the field of reinforcement detection of concrete structures, and in particular relates to a dual shear experiment anti-eccentric loading clamping device and method for solving the problem of eccentricity in the loading process of the reinforcement material / component-concrete interface and the like. Background technique [0002] A large number of in-service reinforced concrete (RC) structures require reinforcement and maintenance due to steel corrosion, material deterioration, increased design standards, and construction defects. The paste reinforcement method is to paste the reinforcement material / component to the concrete structure with adhesive glue, and realize the load transfer through the bonding shear stress between the reinforcement material / component and the concrete interface, so as to achieve joint force and improve the bearing capacity. Reinforcement purposes. Therefore, the bonding performance of the reinforcement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/04
CPCG01N3/24G01N3/04
Inventor 郑小红黄培彦熊勇郭馨艳
Owner SOUTH CHINA UNIV OF TECH
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