Testing device for small-span high-ratio connecting beam pure shear loading

Abstract

The invention discloses a testing device for small-span high-ratio connecting beam pure shear loading, and belongs to the technical field of testing loading devices. The testing device comprises a loading frame part, an active loading part, a rotary limiting part, a connecting beam test piece part and an auxiliary loading part. The loading frame part is composed of an L-shaped steel frame and a side square roller. One end of the side square roller is fixed to a portal type counterforce frame, and the other end of the side square roller ejects the L-shaped steel frame through a roller. The active loading part is composed of an actuator, a loading head, a converting steel plate and high-strength screws. The actuator and the loading head are connected with the L-shaped steel frame through thehigh-strength screws. The rotary limiting part is composed of eight connecting rods, two transverse beams, a support cushion plate and a support. The connecting rods are connected with the L-shaped steel frame, a bottom beam and the transverse beams through the support cushion plate, the support, pins and high-strength bolts. The connecting beam test piece part is composed of a connecting beam and two concrete end blocks and is arranged between the L-shaped steel frame and the bottom beam. The auxiliary loading part is composed of the bottom beam, a jack and a pressing beam. A test piece is connected with the bottom beam and the L-shaped steel frame through high-strength screws. The testing device is simple in structure and convenient to use and detach, and pure shear displacement can beexerted on the small-span high-ratio connecting beam.

Description

technical field [0001] The invention belongs to the technical field of test loading devices, and relates to a test loading device for applying pure shear displacement to a connecting beam with a small span-to-height ratio. Background technique [0002] Coupling beams with small span-to-height ratio are commonly used seismic energy-dissipating components in frame-shear wall structures in high-rise buildings. In order to ensure that the shear walls have sufficient ductility, the principle of "strong wall and weak beams" is adopted to make the coupling beams yield first. Therefore, the connecting beam has become the first line of defense against earthquakes in high-rise buildings, and its role in engineering practice is self-evident. [0003] Domestic and foreign researchers have done a lot of research on the small span-to-height ratio coupling beams, but because the small span-to-height ratio coupling beams are antisymmetric bending deep beams with the inflection point in the ...

AI Technical Summary

Problems solved by technology

Many loading devices on the market ignore the torsional effect of the end blocks of the shear wall, and the coupling beam may be subjected to torque during the test, which cannot guarantee that the coupling beam will withstand pure shear deformation

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