The method of anti-seismic reinforcement in Qingdao


Qingdao seismic reinforcementMethods:

Paste fiber composite method

The reinforcement method of pasting fiber composite material is similar to that of pasting steel, but the reinforcement material is fiber composite material, such as glass fiber reinforced composite material (GFRP), carbon fiber reinforced composite material (CFRP), aramid fiber reinforced composite material (AFRP) It is a reinforcement method that has been studied at home and abroad and has great development potential. Compared with traditional reinforcement materials, fiber composite materials have outstanding advantages such as high strength, light weight, convenient construction, and corrosion resistance. The standard value of carbon fiber tensile strength is 3400mpa, which is 10 times that of ordinary steel bars; the modulus of elasticity is slightly higher than that of steel bars. Used for seismic reinforcement of beams, slabs, columns, bridges, roof truss and other structures.

Increase section method

The increased section method is a traditional reinforcement method that increases the member's cross-sectional area (concrete and steel) to increase the member's bearing capacity. It can be used to reinforce beams, slabs, columns and walls of concrete and brick-concrete structures. The advantages of this reinforcement method are simple process, mature technology, strong reliability, and can improve the rigidity and stability of the component.

External steel reinforcement method

The encased steel reinforcement method is a reinforcement method in which section steel (usually angle steel, flat steel or steel plate) is wrapped in concrete, masonry and other components, and it is also a widely used traditional reinforcement method. The steel-clad reinforcement method can greatly improve the bearing capacity of the component without increasing the cross-sectional size of the component. It is suitable for seismic reinforcement of columns, beams, truss chords and web members, and also suitable for high-rise buildings.

External prestressed reinforcement method

The external prestressed reinforcement method is a method of using external prestressed tendons or supports to reinforce structural members or the whole. It indirectly improves the bearing capacity of the structure by changing the internal force distribution of the original structure, reducing the original stress level of the structure. The prestressed reinforcement method hardly changes the use space, reduces the stress hysteresis through unloading and reinforcement, and achieves the ideal reinforcement effect. The disadvantage is that the prestressed equipment and anchors still need to be improved, and there are certain risks. At present, it is mainly used for the reinforcement of large-span structures, as well as the reinforcement of large-scale structures that cannot be reinforced by general methods or whose reinforcement effect is not ideal.

Bonded steel reinforcement method

The sticking steel reinforcement method is a method of sticking structural glue on the outside of the concrete member to improve the bearing capacity of the structure. This is equivalent to the external reinforcement of the component. At present, this technology has matured. It has the advantages of almost unchanged component shape and use space, simple and quick construction, and small amount of wet work. However, there are requirements for the working environment of reinforced components, the ambient temperature is not higher than 60℃, the relative humidity is not more than 70%, and there is no chemical corrosion, otherwise corresponding measures should be taken. It is suitable for the reinforcement of bending members and tension members under static force and normal environment. It has been widely used in bridges and building structures.

The above isQingdao seismic reinforcementSeveral methods.