Method of FRP reinforced concrete bond slip test

Abstract

The invention discloses a method of an FRP reinforced concrete bond slip test. The method comprises the steps of determining a test piece for the test, manufacturing a connection structure of an FRP reinforced concrete test piece, selecting a universal testing machine, and determining a loading scheme as one-end loading and determining a loading mode as a displacement control mode. According to the step of manufacturing the connection structure of the FRP reinforced concrete test piece, a test piece component is arranged in the middle of poured concrete, and the test piece component is formed by inserting two FRP ribs into the two ends of a sleeve pipe respectively; the other ends of the two FRP ribs extend out of the sleeve pipe, and a bonding layer is arranged in the middle of the sleeve pipe; the two ends of the sleeve pipe are respectively provided with at least two wedged key blocks which are arranged in the sleeve pipe in the direction of the FRP ribs, and the two FRP ribs extend out of the two ends of the concrete; sleeves are arranged at the matched positions of the extending ends of the two FRP ribs respectively. The sleeves at the upper end and the lower end of the connection structure are fixed on an upper anchor and a lower anchor of the universal testing machine respectively. A data collecting system of the universal testing machine is used for collecting the total displacement of the whole connection structure, and a dial indicator is used for collecting relative displacement of the two FRP ribs and the test piece component, namely the sliding amount of the FRP ribs in the test piece component is obtained.

Description

technical field [0001] The invention relates to a test method, in particular to a method for FRP reinforced concrete bond-slip test in double-reinforced tension test. Background technique [0002] At present, with the continuous application of composite materials in building structures, the research on fiber polymer bars (FRP bars) is also getting more and more in-depth. In the study of FRP bars, the research on the bond-slip performance of FRP-bar concrete is more common. Usually, the experimental research methods for the bond-slip performance of FRP-bar concrete are single-bar pull-out test and beam test. [0003] For FRP reinforced concrete structures, the bonding problem is very important. As a composite material made of pultrusion, the bonding performance of FRP bars in concrete is affected by many factors. Many researchers have carried out a large number of experimental studies on this. Most of the tests focus on the bonding strength or the slippage of the loading end...

AI Technical Summary

Problems solved by technology

However, in actual engineering, the slippage of the tendons will cause the concrete to bear the tensile force, and cracks will be generated accordingly, so the data obtained by the above test methods are not reliable

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