Method for reinforcing frame node

Abstract

The invention discloses a method for reinforcing a frame node in the field of structure reinforcement. The method comprises the following steps: (1) bonding a carbon fiber sheet at the angle part of the frame node; and (2) through a high-strength bolt, fixing an angle iron at the angle part of the frame node bonded with the carbon fiber sheet. According to the invention, through a stress system and a restriction system formed by the angle iron, the high-strength bolt and the carbon fiber, the frame node is reinforced, in particular, the bearing capacity of the damaged frame node is rapidly recovered; meanwhile, secondary damage of reinforcing construction to the existing structure is avoided, and obvious social benefits and economic benefits are obtained.

Description

technical field [0001] The invention relates to a technical method for compositely reinforcing frame joints with angle steel, high-strength bolts and carbon fibers in the field of structural reinforcement. Background technique [0002] The frame node is the superimposed part of the frame column and beam in the frame structure system. It is an important stress-bearing part in the whole frame system, and it is also a very complicated part of the force. It bears the two-way bending moment and horizontal shear transmitted by the frame column and beam. In the structural design, structural reinforcement design, especially the seismic reinforcement design, the frame joints are the key strengthening parts. [0003] The formula for calculating the bearing capacity of frame joints in my country's "Code for Design of Concrete Structures" (GB50010-2010) 11.6 is as follows: [0004] 1. The calculation formula of frame joint section: [0005] V j ...

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Problems solved by technology

[0008] In the field of structural reinforcement, the reinforcement of frame joints mainly adopts three methods: cladding steel reinforcement, pasting carbon fiber reinforcement, and reinforced concrete reinforcement with enlarged cross-section. There is a secondary force between the reinforcement materials and the original frame joints in the above reinforcement methods. The problem is that only when the original frame joints bear a large internal force, or even cracks, the reinforcement material can play a role and share part of the internal force, which greatly reduces the reinforcement effect and cannot affect the bearing capacity of the joints. This can be obtained from the formula (1) (2) The definition of each parameter can be reflected. At present, my country's "Code for Design of Concrete Structure Reinforcement" (GB50010-2010) does not mention the influence of the above reinforcement methods on the bearing capacity of frame joints

In addition, because the frame nodes are located in the overlapping area of ​​the frame columns and beam members, it is difficult for the reinforcement materials to pass through, wrap around or wrap the frame nodes smoothly and thoroughly, and the frame nodes are often reinforced by perforating, digging or even welding steel bars, which not only weakens the reinforced frame nodes The effect will also cause secondary damage to the frame joints

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