A test device and method for testing concrete tensile creep

Abstract

A test device for testing concrete tensile creep is disclosed. The device includes a fixed steel rack, a door type connector and a dead-load lever arm. Test pieces are connected between the fixed steel rack and the door type connector through connecting assemblies. The door type connector and the dead-load lever arm are connected through a strengthening fixing bolt. The side surface of the fixed steel rack is connected to a vertical wall through a connecting steel plate and fixing bolts. The bottom of the fixed steel rack is connected to the ground through a connecting steel plate and foundation bolts. The dead-load lever arm is connected to the fixed steel rack through a strengthening connecting steel plate and a strengthening fixing bolt. The dead-load lever arm is connected to a loadingapparatus. Compared with traditional creep devices, the device and a test method for testing concrete tensile creep can measure creep of three test pieces simultaneously, the device overcomes an eccentric axial pulling problem of test pieces through cooperation of lifting rings and shackles, and the device is simple to machine, large in amplification coefficient and large in loading force range.

Description

technical field [0001] The invention relates to the field of concrete structures and materials, and relates to a method for measuring tensile creep of concrete. Background technique [0002] Creep is an inherent mechanical property of concrete, and the tensile creep generated by the internal tensile stress of concrete is an important cause of early cracking of concrete structures. However, since concrete is a brittle material, the tensile creep deformation is small. At the same time, there are major difficulties in the design of direct tensile strength tests on concrete, problems related to stress concentrations during loading, and possible secondary bending and torsion induced in concrete specimens by end clamping, so There are few researches on the tensile creep of concrete at home and abroad, and the tensile creep is usually equated with the compressive creep. But for some larger flat plate structures, the internal tensile stress determines whether the specimen reaches ...

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Problems solved by technology

At the same time, there are major difficulties in the design of direct tensile strength tests on concrete, problems related to stress concentrations during loading, and possible secondary bending and torsion induced in concrete specimens by end clamping, so There are few studies on the tensile creep of concrete at home and abroad, and the tensile creep and compressive creep are usually equated

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