Double-knife hinge support suitable for compression test

Abstract

The invention relates to a double-knife hinge support suitable for a compression test. The double-knife hinge support comprises a lower bottom plate, an intermediate bottom plate and an upper bottom plate which are stacked together, and the upper side of the upper bottom plate is provided with a clamp for positioning the lower end of a component; the lower side face of the upper bottom plate and the upper side face of the lower bottom plate are provided with knife hinges which are orthogonal; and grooves matched with the knife hinges on the upper and lower bottom plates are respectively arranged on the upper and lower side surfaces of the intermediate bottom plate. The double-knife hinge support of the invention can adopt different clamps according to components of different cross sections, and is suitable for the components of different sizes and different cross section types; the clamps are convenient to mount and convenient to adjust, and have the characteristics of being high in test precision and good in controllability; and the test control and safety problems during the axial compression test of the components, such that the alignment of the column axis is difficult, the rotation of the support is difficult, the eccentricity degree in an eccentric compression experiment is difficult to be quantitatively controlled, and a connecting plate falls off in the test process aresolved.

Description

technical field [0001] The invention relates to a double-knife hinge support suitable for compression tests. Background technique [0002] The cross-section forms of compression columns in construction engineering are rich and varied, including rectangular cross-section, circular cross-section, and special-shaped cross-section components. These components are widely used in high-rise buildings, stadiums, bridges and other projects. Axial compression and eccentric compression are the most typical stress modes of compression column members during service, and the axial compression and eccentric compression experiments are the most important technical means to study their mechanical properties. [0003] Boundary support conditions are the key factors affecting the compression test of components. At present, the support types commonly used in column axial compression tests mainly include: welded plate type, spherical hinge type, knife hinge type, and point hinge type. [0004] ...

AI Technical Summary

Problems solved by technology

However, due to the large contact area between the groove and the protrusion, when the axial force is large, the friction between the two is too large, and there is a problem that the node cannot rotate during the actual experiment.

[0006] Knife-hinge bearings have better rotation performance, but the components of traditional knife-hinge bearings and ball-hinge bearings often need to be fixed with plaster, and the installation efficiency is low, especially for eccentric compression tests. Traditional knife-hinge bearings and The fixing method of the ball hinge bearing cannot adjust the relative position of the component and the bearing, nor can it quantify the eccentric position, which greatly increases the difficulty of precision control, and the traditional knife hinge bearing and the ball hinge bearing are due to the separation of the contact plate. , there is a potential safety hazard that the connecting plate falls off during the experiment

[0007] Point-hinged bearings are easy to manufacture, have good rotation performance, and high eccentric position accuracy, but point-hinged bearings are generally only suitable for small-tonnage compression tests, otherwise the point hinges are easily deformed. The accuracy of the eccentric position of the eccentricity test greatly increases the difficulty of precision control, and the point-hinge support and the point-hinge rod may break away from the point pit, causing a safety hazard of falling off during the experiment

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