Seismic retrofitting methods are measures taken to enhance the strength, improve the ductility, enhance the integrity and improve the means of transmitting force in order to make the existing construction structural meet the prescribed requirements for seismic fortification.

Seismic retrofitting direct methods

1, Increase the section reinforcement method:

The method has the advantages of simple construction technique, strong adaptability, and mature design and construction experience. The method is suitable for reinforcing concrete of beams, slabs, columns, walls and general structures. However, wet work on site has a long operation time and has a great impact on production and living Have a certain impact, and after the reinforcement of the building clearance has a certain decrease.

2, Replacement of concrete reinforcement method:

The advantage of this method is similar to that of the enlarged section method, and does not affect the clearance of the building after reinforcement, but also has the disadvantage of long wet working time in construction. The beam and column suitable for the concrete with low strength or serious defects in the compression zone Reinforced concrete load-bearing components.

3, Bonded steel plate reinforcement method:

The Law, also known as wet-clad steel reinforcement method, reliable, easy construction, site workload is small, but the larger amount of steel, and should not be used in unprotected 600C high temperature places; for use It is not allowed to significantly increase the cross-sectional dimensions of the original structure, but requires the reinforcement of the concrete structure to significantly increase its carrying capacity.

4, Steel jacketing method:

The method has the advantages of fast construction, little or no wet work on site, little wet work such as plastering, little impact on production and living, and has no significant effect on the appearance of the original structure and the original headroom after reinforcement, but the reinforcement effect depends to a large extent In the adhesive process and the level of operation; For static and in a normal humidity environment by bending or tension member reinforcement.

5, Bonded carbon fiber cloth reinforcement method:

In addition to the similar advantages of the pasting steel plate, it also has the advantages of corrosion-resistant turbidity, moisture resistance, almost no increase of self-weight of the structure, durability and low maintenance cost, etc. It does not require special fire protection treatment and is suitable for various concrete structures Components and general structures.

6, Around the wire method:

The advantages and disadvantages of the law and increase the cross-section method is similar to the concrete structure of the oblique section of the bearing capacity of inadequate reinforcement, or the need to impose lateral pressure binding member of the occasion.

7, Anchoring reinforcement method:

This method is applicable to the reconstruction and reinforcement of concrete load-bearing structures with concrete strength grades of C20 ~ C60. It is not applicable to the above-mentioned structures and light structures that have been seriously weathered.