Device for strengthening PC steel bar in core area of space node of reinforced concrete cylindrical frame

Abstract

The invention relates to a device for strengthening a PC steel bar in a core area of a space node of a reinforced concrete cylindrical frame, belonging to the strengthening construction field of civil engineering. The device comprises a node core area, an arc anchoring buckle, PC steel bars, nuts and a sealing cap, wherein through holes are formed on two legs of the arc anchoring buckle; the node core area is a cylindrical area composed of a column, a beam and a floor, which are intersected; four arc corners of the node core area are polished; external screw threads are arranged on two ends of the PC steel bar; one leg of the arc anchoring buckle is connected with the nut by one end of the PC steel bar penetrating through the preformed through hole; the sealing cap is arranged outside the nut; four arc anchoring buckles and four PC steel bars form a round PC steel bar hoop for limiting the node core area by the nuts. The device can directly bear shearing force, provide three-way constraint action, relieve stress lagging and improve co-working condition of new and old structures and stress condition of the core area.

Description

technical field [0001] The invention relates to a PC steel bar reinforcement device for the core area of ​​a space node of a reinforced concrete cylindrical frame, belonging to the field of reinforcing the core area of ​​a space node of a reinforced concrete cylindrical frame. Background technique [0002] In civil engineering construction, reinforced concrete frame structures are widely used for their superior seismic performance. Among them, the beam-column joint is an important part of the frame structure, which plays the role of transmitting and distributing internal forces and ensuring the integrity of the structure. During the earthquake, the shear force in the core area of ​​the node is relatively large and extremely complex, which is a vulnerable part of the frame structure, and the brittle shear failure of the core area of ​​the node often leads to the collapse of the entire structure. In the design, the design principles of "strong shear weak bending, strong colum...

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Problems solved by technology

[0010] Generally speaking, the above reinforcement methods are mostly suitable for the reinforcement design of the core area of ​​planar nodes, but there are difficulties in unloading the structure and high cost, lagging strain of the secondary stressed structure, poor reinforcement effect, and inconvenient on-site construction, etc. many problems

Moreover, for the cylindrical frame space nodes, due to the existence of perpendicular beams around them, it is inconvenient to reinforce the package in the core area of ​​the node. Therefore, the reinforcement problem of the core area of ​​the cylindrical frame space nodes has not been well resolved.

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