Buckling-restrained steel pipe-FRP confined concrete combined member and construction method

Abstract

The invention discloses a buckling-restrained steel pipe-FRP confined concrete combined member and a construction method, the buckling-restrained steel pipe-FRP confined concrete combined member comprises an FRP winding forming pipe and further comprises a steel pipe arranged in the FRP winding forming pipe, the outer wall of the steel pipe is provided with a reinforcing key, and a high-strength mixture layer is poured between the steel pipe and the FRP winding forming pipe. By arranging the high-strength mixture layer, reinforcing keys can be conveniently arranged, so that a synergistic effect of composite constraint of the steel pipe, the high-strength mixture layer and the FRP winding forming pipe is provided, interfaces of all the layers are prevented from entering a separation state in advance, and the constraint effect on core concrete is enhanced; the steel pipe is further prevented from buckling inwards and outwards too early to cause ultimate bearing capacity reduction and rigidity degradation of the combined component, meanwhile, the annular fiber FRP layer and the steel pipe are promoted to be more integrally and cooperatively restrained, the mechanical property of the combined column is improved, and the combined column can be suitable for engineering construction in earthquake-proof areas and offshore areas.

Description

technical field [0001] The invention relates to the technical field of building structures, in particular to an anti-buckling steel pipe-FRP restrained concrete composite member and a construction method. Background technique [0002] Because of its excellent light weight, high strength, corrosion resistance and designability, FRP material can be combined with concrete made of seawater and sea sand in marine structural engineering, thus effectively solving the problems of steel corrosion, shortage of fresh water and river sand resources. problems, as well as the high cost of material selection, transportation and maintenance of building structures in offshore areas. [0003] At present, in the field of civil engineering structures, the composite structure of FRP-steel composite pipe restrained concrete has become a research hotspot. This kind of member can further delay the buckling problem of the steel pipe, thereby improving the ductility and ultimate bearing capacity. The...

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Problems solved by technology

[0003] At present, in the field of civil engineering structures, the combined structure of FRP-steel composite tube confined concrete has become a research hotspot. This component can further delay the buckling of the steel tube, thereby improving the ductility and ultimate bearing capacity. The fiber cloth is wrapped in the steel tube. On the outer surface of the outer wall, although the restraint effect of the structure can be further improved, the longitudinal compressive stiffness of the fiber cloth itself is extremely low; the FRP pipe is bonded to the steel pipe through epoxy resin, and the interface synergy between the FRP pipe and the steel pipe needs to be improved. Under the action of pressure or bending load, component failure often occurs when the interface between the FRP pipe and the steel pipe is detached, and the steel pipe usually buckles outward prematurely, resulting in failure of the bearing capacity of the composite structure

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