Determination apparatus and determination method for concrete impact flexural-tensile injury based on non-equilibrium state

Abstract

The present invention discloses a determination apparatus for concrete impact flexural-tensile injury based on non-equilibrium state. The determination apparatus is characterized by comprising a gas gun, a bullet, an incident rod, a transmission rod, a strain sheet, a bridge box and a data acquisition system connected with a computer, wherein the strain sheet is adhered on the middle portion of the incident rod and is connected with the data acquisition system through the bridge box, the incident rod and the transmission rod are respectively provided with a sleeve head, the sleeve heads are respectively provided with a pad block, and a concrete specimen is sandwiched between the pad blocks on the two rods. With the determination apparatus and the determination method of the present invention, the concrete injury theory is introduced into the flexural concrete determination under impact load, such that the difficulty that the flexural concrete injury time is short under the impact load is overcome, and the relationship curve between the tensile strength and the injury time during the concrete flexibility is obtained; and the difficult problem that the transmitted wave is difficult to determine through the test is overcome, and the error is substantially reduced during the wave superimposing.

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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