Clamp for single shear test of combined structure connection

Abstract

The invention relates to a clamp for a single shear test of combined structure connection, and belongs to the technical field of material testing. The clamp comprises an upper clamp and a lower clamp;during a test, a test piece is placed in the lower clamp and tightened, the upper clamp applies a load downward for testing, the upper clamp provides a vertical pressing load for the test piece, andthe lower clamp provides a vertical support and lateral restraint for the test piece. The clamp provided by the invention has wide applicability to the test piece of the single shear test of the combined structure connection, can be adjusted according to the size of the test piece, and avoids the trouble of repeatedly manufacturing the clamp. The upper clamp can ensure uniform stress on the test piece and avoid local bearing damages; the lower clamp can ensure that the test piece is displaced only in a direction of force application to prevent the test piece from overturning laterally, and thecontact position between a roller wheel of lateral restraint devices on the left and right sides of the lower clamp and the test piece can be approximately point contact, thereby reducing the friction between the test piece of the single shear test and the lower clamp, and then improving the accuracy of the test.

Description

technical field [0001] The invention relates to a fixture used for simple shear tests of combined structure connections, belonging to the technical field of material testing. Background technique [0002] Composite structure is a structural form in which components of two different materials are connected together to form a whole through connectors, including steel-wood, wood-concrete, steel-concrete composite structures, etc., because they give full play to the good properties of the two materials. Mechanical properties, so the application is more and more extensive. The connection is the key to ensure that the two materials play a good combined role, and the stiffness and strength of the connection are the main parameters of the composite structure design. [0003] At this stage, the mechanical properties of composite structure connections are generally obtained accurately through experiments. Commonly used test methods are simple shear test and push-out test. The specim...

AI Technical Summary

Problems solved by technology

When the single shear test specimen is stressed, due to the asymmetric structure of the specimen, if there is no lateral restraint, the specimen will be seriously tilted, which will affect the test result and even cause the test to be interrupted.

There are fixtures used for simple shear tests of combined structures in foreign countries. The polytetrafluoroethylene panels in the fixtures provide lateral restraints for the specimens in the simple shear tests. Although the lateral restraint panels are made of polytetrafluoroethylene materials, they can However, due to the large contact area between the PTFE panel that provides lateral restraint and the specimen, the friction between them is also more obvious, thus overestimating the specimen to a large extent The shear bearing capacity of the test results has a large deviation from the actual

In addition, the existing fixtures reported in foreign literature have poor flexibility, that is, when the size of the specimen changes, the fixture needs to be redesigned

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