An experimental device and experimental method for impact tension and torsion loading

Abstract

The invention discloses an experimental device and an experimental method for impact tension and torsion loading, belonging to the field of impact dynamic experiments. The experimental device includes a drop hammer, a test piece, an impact force transmission device, a loading disc, a measuring device, and a test piece fixing device; the drop hammer falls and impacts the transmission target, and the transmission target moves on the track after being impacted. The loading device applies prestress to the impact target by adjusting the screw stem, and the two sides of the impact target are respectively connected to the loading disk by a steel wire rope. The steel wire rope is equipped with a force sensor, and the disk transmits the tensile force and tensile torque to the steel bar of the test piece. Metal strain gauges are attached inside the steel bar of the specimen to measure the stress distribution along the anchorage length of the steel bar. The invention studies the bonding stress distribution of reinforced concrete anchoring steel bars under the action of double loads of impact tension and torsion, and lays a strong foundation for studying the constitutive relationship of anchoring bond slip under the action of complex 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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