Buckling-resistant brace with hoop prestress, method and application

Abstract

The invention discloses an anti-buckling support with circumferential prestressing, a method and application. The anti-buckling support comprises a support core material, an inner sleeve and an outer sleeve, wherein a steel pipe is used as the core material; the inner sleeve is used for supplying circumferential prestressing to the core material and is arranged in the support core material; the outer sleeve is used for improving the local stable bearing capacity and overall stable bearing capacity of the support core material and is arranged outside the support core material; and a friction reducing layer is respectively arranged between the support core material and the inner sleeve as well as between the support core material and the outer sleeve so as to reduce the limit of the inner and outer sleeves to axial deformation of the core material. According to the anti-buckling support, the self weight of the support is small, and although the cross section of the structure is composed of three layers of steel pipes, the combined section is still a hollow section; compared with a solid section, the component weight is greatly reduced, and the hysteretic behavior is good; the support core material, the outer sleeve and the inner sleeve are made of uniform steel products, so that the strength is high, the durability is good, and the hysteretic behavior is good; and the circumferential prestressing is applied to the core material so as to reduce the axial bearing capacity of the core material, so that the core material is easier and faster to yield, the shock resistance is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the related technical field of construction engineering, in particular to a buckling-resistant support with hoop prestress, a method and an application. Background technique [0002] The frame-bracing system is a common structural system in multi-story buildings. The lateral rigidity and lateral bearing capacity of the frame structure can be improved by setting the support. For building structures that require seismic fortification, steel braces can dissipate seismic energy through yielding. However, if it is ensured that the steel support yields under earthquake action, its cross-sectional size needs to be limited. [0003] Under the action of reciprocating load under the earthquake, the steel support with too small section will buckle under compression, and the hysteretic performance is poor. Therefore, buckling-resistant braces are widely used in structures at present. The basic principle is to ensure that the steel brace...

AI Technical Summary

Problems solved by technology

[0005] 1. Waste of steel

Since the main force-bearing element of the traditional buckling-resistant brace is the core part, the cross-sectional area is concentrated, and the slenderness ratio is large, which is prone to buckling

In order to prevent the buckling of the core material, it is necessary to add an outer sleeve with a larger cross-sectional size; the outer sleeve mainly prevents the overall buckling of the core material, does not participate in bearing the axial force, and does not fully utilize the steel, resulting in waste of steel; Concrete materials need to be filled between them, and the material consumption is large

[0006] 2. Self-heavy

The concrete filling material between the core material and the outer sleeve is heavy and has low strength

[0007] 3. The restrained concrete between the core material and the outer sleeve is easily crushed under the reciprocating load of the earthquake and loses the restraint and anti-buckling functions, resulting in a significant reduction in the energy dissipation capacity of the anti-buckling support

[0008] 4. If it is necessary to reduce the bearing capacity of the anti-buckling support, it is necessary to slot or open holes in the core material to weaken the core material. The construction process is troublesome, the quality control is difficult, and the support reliability is reduced.

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