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Pendulum impact testing machine for impact of concrete simply supported beam and impact testing method

A technology of impact testing machine and simply supported beam, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of high failure rate of test data and lack of systematic research on characteristics, so as to improve test efficiency, high test accuracy, and design reasonable effect

Pending Publication Date: 2022-07-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, a large amount of research on impact resistance tests has focused on the response analysis under high-speed impact loads, such as bullet impact tests, explosion tests, Hopkinson pressure bar tests, etc. Lack of systematic research, such as the impact of vehicles on concrete infrastructure in traffic accidents, the impact response of falling objects on concrete components, etc.
There are many defects in the low-speed impact test specified in the American ACI544 specification, especially the failure rate of the test data is too high
In the current pendulum impact test of simply supported beams, the impact load and absorbed energy of the pendulum can only be roughly estimated, and the load-time curve and deflection-time curve of the specimen cannot be directly measured, and these are the analysis of the impact response Therefore, it is necessary to develop a test device that can intuitively and quantitatively test the impact resistance of concrete, especially in the direct and stable acquisition of the load-time curve and deflection-time curve of concrete specimens under impact load

Method used

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  • Pendulum impact testing machine for impact of concrete simply supported beam and impact testing method
  • Pendulum impact testing machine for impact of concrete simply supported beam and impact testing method
  • Pendulum impact testing machine for impact of concrete simply supported beam and impact testing method

Examples

Experimental program
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Embodiment 1

[0041] like figure 1 As shown, the pendulum impact testing machine for concrete simply supported beam impact in this embodiment includes a main support frame 1, two pendulum releasers 2, a pendulum, a base 4, a specimen support mechanism, a load sensor 5 and a displacement sensor ; The main support frame 1 is a T-frame; the two pendulum releasers 2 are fixed at both ends of the main support frame 1 by bolts, and the pendulum releaser 2 is used to fix and release the pendulum. Generally, the pendulum releaser 2 adopts electromagnetic The pendulum body releases the pendulum to ensure that the initial speed is zero when releasing, reducing the test error; the upper end of the pendulum is rotatably connected with the main support frame 1 through the rotating shaft, and the pendulum and the rotating shaft rotate together; The lower end is fixedly connected, and can be fixed by welding; the specimen support mechanism is arranged above the base 4 to hold the test piece 10; the load s...

Embodiment 2

[0053] This embodiment is basically the same as the first embodiment, the similarities will not be repeated, and the differences are as follows:

[0054] like figure 2 As shown, the test piece support mechanism includes an anti-rebound component, a front bearing platform 13 and a rear bearing platform 14. The front bearing platform 13 and the rear bearing platform 14 are both fixed on the base 4, and together form a space that can accommodate In the groove of the test piece 10, the anti-rebound component is fixed on the upper part of the front support table 13, and the anti-rebound component is used to prevent the test piece 10 from producing a large displacement under the impact, and play a buffer role; such as image 3 As shown, the anti-rebound assembly includes a positioning bolt 15, a bolt knob 16, a front top plate 17 and a rear top plate 18, a spring 19 is provided between the front top plate 17 and the rear top plate 18, and the positioning bolt 15 is connected to the...

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Abstract

The invention belongs to the technical field of concrete material testing, and particularly relates to a pendulum bob impact testing machine for impact of a simply supported concrete beam and an impact testing method.The pendulum bob impact testing machine comprises a main supporting frame, two pendulum bob releasers, a pendulum bob, a base, a test piece supporting mechanism, a load sensor and a displacement sensor; the main support frame is a T-shaped frame; the two pendulum releasers are fixed to the two ends of the main supporting frame and release the pendulum through the electromagnets. The upper end of the pendulum bob is rotationally connected with the main supporting frame through a rotating shaft; the base is fixedly connected with the lower end of the main support frame; the test piece supporting mechanism is arranged above the base and is used for bearing a test piece to be tested; the load sensor is mounted on the base and is used for collecting the impact load of the to-be-tested piece; the displacement sensor is a non-contact displacement sensor or a contact displacement sensor and is used for collecting deformation of the to-be-tested piece. The device can visually and quantitatively detect the impact resistance of concrete, and is reasonable in structural design and accurate and effective in measured data.

Description

technical field [0001] The invention belongs to the technical field of concrete material testing, and particularly relates to a pendulum impact testing machine and an impact testing method for the impact of a concrete simply supported beam. Background technique [0002] Concrete has been widely used in different types of building structures. Some concrete structures that are often subjected to shock loads such as waves, explosions or vehicles have specific requirements for impact resistance. To suffer impact damage, it is necessary to understand the impact resistance of the concrete used. [0003] In recent years, a large number of impact test researches have focused on the response analysis under high-speed impact loads, such as bullet impact test, explosion test, Hopkinson compression bar test, etc. There is a lack of systematic research, such as the impact of vehicles on concrete infrastructure in traffic accidents, and the impact response of falling objects to concrete ...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/303
CPCG01N3/02G01N3/303
Inventor 高丹盈郭亚江汤寄予马博魏东王豪张威徐智
Owner ZHENGZHOU UNIV