Reinforcement technology of beam bonded FRP composite materials

Beam bonding FRP composite reinforcement technology is to use carbon fiber cloth and special structural glue to reinforce the raw sorghum. Carbon fiber fabric reinforcement technology is now more and more widely used in beam structure reinforcement. Its advantages are:

(1) The tensile strength of fiber composite material is 7-10 times higher than that of steel with the same cross-section.

(2) Light weight, density only 1/4 of ordinary steel;

(3) The durability of CFRP reinforcement is good, and it can resist chemical corrosion and damage of harsh environment and climate change.

(4) The construction of CFRP reinforcement is convenient, fast, labor-saving and time-saving, and the construction quality is easy to guarantee.

(5) After reinforcement, there is no significant impact on the appearance of the original structure and the original clearance, and the maintenance cost is low.

Addition of steel bars and increasing the cross section area of the concrete:

This process is done when the reinforcement in the beam is not capable to carry the stresses applied to it. In this process, firstly the concrete cover is removed from both upper and lower steel bars. Then the steel bars are cleaned well and they are coated with a specific material which would prevent corrosion. Holes of 13mm diameter are made along the whole span of the beam under the slab with a spacing of 150-250m.

These holes are extended to the total width of the beam and are filled with an epoxy material with low viscosity. The steel connectors are installed for fastening the new stirrups. In order to fasten the steel bars added to the beam, steel connectors are installed into the columns. The added stirrups are closed using steel wires and the new steel is installed into these stirrups. The surface is then coated with a bonding epoxy material. The concrete cover is poured over the new steel and the new stirrups.

Reinforcement technology of beam bonded steel plate

Beam-bonded steel plate reinforcement method is a special structural adhesive, the steel plate is bonded to the surface of reinforced concrete beams, can achieve the purpose of strengthening and strengthening the strength and stiffness of the original beam. The main advantages of the reinforcement are as follows:

1. Strong and durable. It has been proved that the quality of reinforcement works can be guaranteed. The strength and stiffness of beams can meet the design requirements.

2. The construction is fast, and the construction task can be accomplished quickly on the premise of guaranteeing the quality of the beams strengthened with bonded steel.

3. Simple and lightweight. Compared with other reinforcement methods, the construction of beam bonded steel reinforcement is clean, simple and non-wet.

4. Flexible and versatile, with strong adaptability, can solve all kinds of problems related to production and life;

5. It is economical and reasonable. Compared with other reinforcement methods, the cost of steel-bonded beam reinforcement is greatly saved and the economic benefit is very high.

Reinforcement technology of beam by prestressed CFRP system