Measuring device and method for impact bending and tensile damage of concrete based on non-equilibrium state

Abstract

The invention discloses a measuring device for impact bending and pulling damage of concrete based on non-equilibrium state, which is characterized in that it includes an air gun, a bullet, an incident rod, a transmission rod, a strain gauge, a bridge box and a data acquisition system connected with a computer, Strain gauges are pasted in the middle of the incident rod, and the strain gauges are connected to the data acquisition system through the bridge box. Set up sleeves on the incident rod and the transmission rod respectively. Blocks are set on the sleeves, and the concrete specimen is clamped on the two rods. between pads; a kind of measuring device and measuring method based on non-equilibrium concrete impact bending and tensile damage of the present invention introduces the concrete damage theory into the measurement of bending concrete damage under impact load, and overcomes the impact load under impact load. Due to the difficulty of short failure time of bent concrete, the relationship curve between the tensile strength and failure time of concrete when it is bent is obtained; the difficulty of measuring the transmitted wave in the test is overcome, and the error is greatly reduced when the wave is superimposed.

Description

technical field [0001] The invention belongs to the field of impact dynamics, in particular to a method for measuring concrete damage, in particular to a method for quantitatively describing the process of concrete bending and pulling damage under impact load. Background technique [0002] With the rapid development of my country's economy and society, there are more and more types of civil construction materials. Since the last century, due to the advantages of low cost and high strength, concrete has always occupied a dominant position among civil engineering materials. As we all know, concrete is a typical quasi-brittle material, and its tensile strength is much smaller than its compressive strength. Therefore, in engineering, concrete is often made into various compression members to bear the pressure. However, often in earthquakes and some engineering activities, concrete will inevitably be subjected to various tensile forces, which can easily cause buildings and struc...

AI Technical Summary

Problems solved by technology

However, in real life, concrete is often used as a flexural member, and the measurement of its damage during bending cannot be ignored, especially under the action of impact load, the damage time of flexural concrete is extremely short. Under this loading method, the measurement and calculation of its damage very difficult

Although there are researches on the damage of flexural concrete under static load, there is still no method for measuring and quantitatively describing the damage law of flexural concrete under impact load.

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