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. What reinforcement methods are available for steel frame buildings?
Add fulcrum reinforcement method
After adding fulcrums to the beams and slabs in the middle of the span, the span is reduced, so that the bearing capacity can be greatly improved, and the deflection deformation of the beams and slabs can be reduced and limited. It is suitable for the reinforcement of horizontal structures such as beams, slabs, trusses, grids and other horizontal structures in large-span structures with unrestricted house clearance. Its advantage is simple and reliable, and its disadvantage is that the use of space will be affected to a certain extent.
Adhesive Outsourcing Steel Reinforcement Method
Reinforced concrete beams strengthened by outsourcing steel generally adopt the wet outsourcing method, that is, adopt epoxy resin grouting and other methods to bond the section steel and the reinforced member into a whole. Therefore, the bearing capacity of the positive section and the stiffness of the section are also greatly improved.
In addition to the similar advantages of the bonded outsourcing steel reinforcement method, the fiber-reinforced plastic reinforcement method also has the advantages of corrosion resistance, moisture resistance, almost no increase in structural weight, durability, and low maintenance costs. However, special fire protection treatment is required, and it is suitable for concrete structural members and general structures of various mechanical properties. After the reinforcement project is completed, gently tap the pasted steel plate with a small hammer to judge the bonding effect from the sound or detect the pasting density with the ultrasonic method. 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 paste is invalid and should be peeled off and pasted again.
For steel frame buildings of major projects, load tests must be carried out on samples to test the reinforcement effect. Generally, only the standard service load test is used, that is, all the unloaded loads are added again, and the deformation and crack development of the structure should meet the design and service requirements.
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