Center drawing device and method for simultaneously measuring bonding strength and sliding distance

Abstract

The invention discloses a central drawing device and method for simultaneously measuring bonding strength and slip distance, and the central drawing device comprises a drawing testing machine which isused for providing drawing tension; a loading frame which at least comprises a first plate body, a second plate body and a third plate body, wherein the first plate body and the second plate body arevertically arranged, and the third plate body is horizontally arranged, arranged between the first plate body and the second plate body and located at the bottoms of the first plate body and the second plate body, the loading frame is mounted on the drawing testing machine through the tops of the first plate body and the second plate body, and a through hole is formed in the third plate body; ananchorage device which is fixedly mounted below the loading frame; an LVDT displacement sensor and a mounting bracket. In a steel bar or FRP bar concrete structural member to be measured, the two endsof the steel bar or FRP bar extend out of a concrete base body, and the mounting bracket is used for fixing the LVDT displacement sensor to the steel bar or FRP bar.

Description

technical field [0001] The invention belongs to the technical field of material performance testing, and specifically relates to a central drawing device and a measuring method for simultaneously measuring bond strength and slip distance, and is mainly used for measuring bond strength and slip between steel bars or FRP bars and new concrete relationship between distances. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Alkali-activated concrete, as a new type of green cementitious material, uses industrial solid waste as raw material, has the characteristics of low energy consumption, low carbon emission, and convenient preparation, and has broad application prospects. I...

AI Technical Summary

Problems solved by technology

For example, the commonly used pull-out test device uses a dial gauge or a dial gauge to record the sliding distance between the steel bar or FRP bar and the concrete, and the relative slippage between the steel bar or FRP bar and the concrete is very small in the initial stage. It is difficult to accurately measure the slippage of the steel bar in the initial elastic stage with a gauge or a dial gauge, and manual reading is required when recording the slippage distance, so the pull-out force corresponding to the slippage cannot be accurately obtained, which affects the bond-slip curve At the same time, when the loading direction of the pull-out test device is upward, it will also affect the test results. At this time, the steel or FRP-reinforced concrete specimen will be in a suspended state during the test, and the weight of the specimen will affect the pull-out force. value, which finally affects the accuracy of the bond-slip curve

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