Column full-section partition plate type stirrup-free fiber reinforced concrete mixed frame joint

Abstract

The invention relates to the field of concrete structures and combined structure buildings, and provides a reinforced concrete column-steel beam mixed frame joint adopting a column full-section partition plate type and fiber reinforced concrete. An upper horizontal joint plate and a lower horizontal joint plate which are in the column full-section partition plate type are adopted; round holes areformed in the peripheries of the joint plates, and column longitudinal steel bars penetrate through the round holes; horizontal shear keys are arranged on the surfaces of the joint plates; no stirrupis arranged between the upper joint plate and the lower joint plate, and the fiber reinforced concrete is poured; the joint plates extend outwards to form short beams, the flanges of the short beams are variable sections, and webs are welded between the flanges and are in bolted connection or welded connection with a midspan steel beam; and the inner ends of the webs of the short beams can be provided with surface bearing plates perpendicular to the webs, and the surface bearing plates are welded to the webs, the upper joint plate and the lower joint plate so as to increase the shear capacityof the joint. According to the reinforced concrete column-steel beam mixed frame joint, the column end can be prevented from being damaged due to pressure bearing, and the stress performance of the joint is improved; and meanwhile, the joint stirrup is omitted, the manufacturing process of the joint is simplified, and prefabricated construction is facilitated.

Description

technical field [0001] The invention relates to the field of concrete structures and combined structure buildings, in particular to a node of a reinforced concrete column-steel beam hybrid frame structure in the form of a column full-section partition. Background technique [0002] The joints of the existing reinforced concrete column-steel beam hybrid frame structure mainly include the beam penetration form, the column penetration form and the end plate high-strength bolt connection form, each of which has the following problems: [0003] 1. Existing beam-through joints ( Figure 5 ), due to the narrow steel beam flange, the lever reaction force causes the stress concentration of the concrete at the end of the column to cause pressure failure, and the energy dissipation capacity and ductility of the joint are poor, which needs to be avoided by complex structural measures during design; at the same time, due to the steel beam flange and The web runs through the joints, and t...

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Problems solved by technology

[0003] 1. Existing beam-through joints ( Figure 5 ), due to the narrow steel beam flange, the lever reaction force causes the stress concentration of the concrete at the end of the column to cause pressure failure, and the energy dissipation capacity and ductility of the joint are poor, which needs to be avoided by complex structural measures during design; at the same time, due to the steel beam flange and The web runs through the joints, and the shear stirrups in the joint area must pass through the webs, which makes it difficult to configure the stirrups; and no matter whether the vertical pouring or horizontal pouring, there are dead corners in the concrete pouring space, it is difficult to ensure the quality of the pouring

[0004] 2. Nodes in the form of existing column penetrations ( Image 6 ), the flange of the steel beam is not connected, and stress concentration occurs at the end plate, and the end plate is prone to out-of-plane warping deformation, which makes it difficult to ensure the effective transfer of stress at the beam end from one side to the other; the weld between the steel beam and the end plate The requirements are high, and it is difficult to develop plastic deformation in the welding-affected area; the joint area is not equipped with shear stirrups, and relies on the web and column steel plates to resist shear, forming a vertically penetrating and horizontally closed joint space, which is only suitable for vertical concrete pouring and is difficult to achieve Integrated prefabrication of joints and reinforced concrete columns requiring horizontal pouring

[0005] 3. The vertical and horizontal reserved screw holes of the high-strength bolt connection joints of the end plates weaken the shear capacity of the concrete in the joint area to a certain extent, and the bolts may undergo stress relaxation over time, and their long-term reliability needs further research; the pouring of joint concrete Behavior is similar to column through form

[0006] 4. Regardless of the existing beam penetration form or the existing column penetration form, the steel layout in the joint area is relatively complicated, the welding workload is heavy, the joint fabrication and assembly are complicated, the stirrups in the joint area are difficult to arrange, and the space for concrete pouring and vibration is narrow. It is not convenient for factory prefabrication, and it is not conducive to on-site pouring construction

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