Reinforcement method of steel structure building.
Steel structures are often used in various engineering structures with large spans, large heights, large loads, and large dynamic effects, and have a wide range of applications. With the development of steel structure, its stability becomes more and more important.
1. Additional support point reinforcement method for steel structure.
After the beams and slabs are added with fulcrums in the middle of the span, the span is reduced, which can greatly increase the bearing capacity, and can reduce and limit the deflection and deformation of the beams and slabs. It is suitable for the reinforcement of horizontal structures such as beams, slabs, trusses, and grids in large-span structures with unrestricted house clearance. It has the advantages of simplicity and reliability.
2. The steel structure is reinforced with bonded outer profile steel.
Steel-clad reinforced reinforced concrete beams generally adopt the wet-clad method, that is, epoxy resin grouting and other methods are used to bond the section steel and the reinforced component into a whole. After the reinforced component, the cross-sectional area of the steel under tension and compression is greatly increased. Therefore, the front section bearing capacity and section stiffness are also greatly improved.
3. The steel structure is reinforced with fiber-reinforced plastic.
The bonding fiber reinforced plastic reinforcement method, in addition to the advantages similar to the bonding outer profile steel reinforcement method, also has the advantages of corrosion resistance, moisture resistance, almost no increase in structural weight, durability, and low maintenance costs, but it requires special fire protection treatment , Suitable for concrete structural members and general structures with various force properties. After the reinforcement work is completed, use a small hammer to gently tap the pasted steel plate to judge the bonding effect from the sound or use the ultrasonic method to detect the paste density. If the sticking area of the anchoring area is less than 90%, and the sticking area of the non-anchoring area is less than 70%, the pasting is invalid and should be removed and re pasted.
For major projects, in order to check the reinforcement effect, a sample load test must be performed. Generally, only a standard load test is performed, that is, all the unloaded loads are added again, and the structural deformation and crack development should meet the design and use requirements.