Radial inclination compressive strength test device for round-section concrete-filled steel tube

Abstract

The invention discloses a radial inclination compressive strength test device for a round-section concrete-filled steel tube and belongs to the field of structural engineering. The device is characterized in that by combination of a main foundation, an auxiliary foundation, a roller frame and the like, the radial inclination load of the concrete-filled steel tube is positioned in a vertical direction. When simple vertical load is applied to concrete-filled steel tube test blocks by a loading end head and a loading rod, the test stimulation of the inclination load transmitted by radial inclination limb rod pieces and applied to the test blocks is realized; and by the design of the circular arc surface of the auxiliary foundation, the round-section test blocks are effectively supported. The internal force of the rod pieces is tested in real time by using a load sensor; and strain data, deformation data and other data of the test blocks in the test process are obtained by using a strain gauge, a displacement meter and other measurement instruments. Different test blocks can be replaced conveniently, so that the device can be used repeatedly. The device is suitable for the strength test and the research of the round-section concrete-filled steel tube rod pieces in truss, tower, and lattice structures in the radial inclination load.

Description

technical field [0001] The invention belongs to the field of structural engineering in civil engineering, and in particular relates to a test device for radially inclined compressive strength of circular section steel tube concrete. Background technique [0002] As we all know, trusses, towers, and lattice structures with circular tube sections have excellent properties such as light weight, good overall performance, high torsional rigidity, and the ability to give full play to the strength of materials. It also has great advantages in terms of fire protection and fire protection, so it is more and more widely used in modern buildings. In this type of structure, the use of concrete-filled steel pipe members can produce multiple effects: on the one hand, the concrete in the pipe improves the strength, stiffness and fire resistance of the member, and delays the local buckling of the steel pipe; on the other hand, the concrete is in a composite state under the constraints of th...

AI Technical Summary

Problems solved by technology

In the traditional test method, in order to realize the loading of inclined load, it often requires a large-scale laboratory self-reflexive force frame device, combined with hydraulic jacks, MTS and other test equipment, the boundary conditions are complex, the control is difficult, and the requirements for the device are high. And it is prone to problems such as load direction deviation and out-of-plane instability caused by oblique loading

Since the radial pressure bearing capacity of CFST is much higher than that of traditional empty steel pipe members, a larger load is required to achieve the purpose of destructive testing, which greatly increases the difficulty of oblique loading

At the same time, the existing equipment cannot provide an effective support surface for the circular cross-section specimen, so it is difficult to carry out the compressive strength test on the circular cross-section concrete filled steel pipe

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