Experimental device and experimental method of impact drawing-twisting load

Abstract

The invention discloses an experimental device and an experimental method of impact drawing-twisting load, belonging to the field of impact dynamics experiments. The experimental device comprises a drop hammer, a test piece, an impact force transfer device, a loading disc, a measuring device and a test piece fixing device; the drop hammer drops down to impact a transmission target, the transmission target moves on a track after being impacted, a base is provided with a prestress loading device, the prestress is applied to an impact target through an adjusting threaded rod, two sides of the impact target are respectively connected to the loading disc through steel wire ropes, each steel wire rope is provided with a force sensor, the disc transfers the drawing force and twisting force to a reinforcing steel bar of the test piece, and a metal strain gauge is attached inside the reinforcing steel bar of the test piece and used for measuring the stress distribution along the anchoring length of the reinforcing steel bar. According to the experimental device and the experimental method, the bond stress distribution of a reinforcing steel bar concrete anchoring reinforcing steel bar under the drawing and twisting load effects of the impact is researched, and a powerful foundation is set for researching a constitutive relation of anchoring bond slip under the effect of complicated stress.

Description

technical field [0001] The invention relates to an experimental device and an experimental method for impact tensile torsional loading, in particular to an experimental device and an experimental method for the bond stress of reinforced concrete anchorage under the action of impact tensile and torsional load, belonging to the field of impact dynamics experiments. Background technique [0002] The bond between steel bar and concrete is a complex interaction between steel bar and surrounding concrete, and it is the prerequisite for the composite member composed of two materials to work. Generally, the bond between the steel bar and the concrete is produced after the reinforced concrete is stressed. Shear stress is defined as bond stress. At present, the experimental research on bond stress analysis of reinforced concrete anchorage can be roughly divided into simple pull-out experiment, dynamic pull-out experiment, impact pull-out experiment, and the above-mentioned experiment ...

AI Technical Summary

Problems solved by technology

At present, the experimental research on bond stress analysis of reinforced concrete anchorage can be roughly divided into simple pull-out experiment, dynamic pull-out experiment, impact pull-out experiment, and the above-mentioned experiment of applying confining pressure, but there is almost no impact pull-torsion experiment. Experimental data on the bond stress distribution of reinforced concrete under torsional loading are rather scarce

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