Testing device and method for bidirectional tensile bonding of weak-rigidity reinforcement

Abstract

The invention discloses a testing device and method for bidirectional tensile bonding of weak-rigidity reinforcement. The testing device comprises a bidirectional actuator, a test piece, a counterforce frame and a loading frame, wherein the test piece comprises a concrete test block and a reinforcement, the reinforcement penetrates the concrete test block and is bonded with the concrete test block, the bidirectional actuator can drive the loading frame to apply bidirectional force to the concrete test block in the length direction of the reinforcement through a converter; when the loading frame applies force to the concrete test block in the length direction of the reinforcement, the counterforce frame applies counterforce to the reinforcement. Relative slip between the weak-rigidity reinforcement and the concrete test block can be measured, so that the bond-slip constitutive relationship of the weak-rigidity reinforcement under the action of bidirectional stress load can be established, and reliable and real theoretical support can be provided for practical engineering.

Description

technical field [0001] The invention relates to the technical field of structural engineering, and more particularly relates to a test device and a test method for the bidirectional tensile bonding of weakly rigid reinforcing bars. Background technique [0002] Weak stiffness bars mainly refer to steel strands and FRP bars (fiber reinforced composite bars), which have good tensile properties, but have low flexural stiffness and are prone to lateral bending under axial pressure. Steel strands are widely used in bridge engineering and prestressed components in large-span space structures, and are indispensable reinforcement materials in current engineering; while FRP reinforcement is due to its light weight, high strength, corrosion resistance, low relaxation and fatigue resistance. Good and other advantages, it is considered to be an ideal reinforcement for replacing steel bars. The reason why the concrete structure can exert the compressive performance of concrete and the t...

AI Technical Summary

Problems solved by technology

However, for weak stiffness bars such as FRP bars and steel strands, the existing pull-out test devices have the following disadvantages: first, the lateral bending of the bar is too large when it is compressed, and the test cannot be carried out; secondly, the end of the FRP bar When the part is clamped by the loading equipment, it is fragile, so that the load cannot be applied, so that the accurate bond-slip constitutive relationship cannot be obtained

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