With the continuous increase of existing concrete structure diseases and the continuous improvement of people's awareness of earthquake resistance, more and more building structures can no longer meet the needs of use.

"Structural reinforcement" can not only improve the bearing capacity and durability of the structure, but also improve the seismic capacity.

So can it be considered that conventional structural reinforcement can simultaneously increase the bearing capacity and seismic capacity, and that the two can be treated the same?

In fact, although bearing capacity reinforcement and seismic reinforcement are both structural reinforcement, there are still certain differences between the two.

If earthquake resistance is not considered and only the bearing capacity of the components is increased, it will often have an adverse effect on the earthquake resistance of the structure. For example, strengthening the components in the seismic fortified area may not be beneficial to earthquake resistance.

Therefore, in reinforcement, the difference between the two should be clarified to prevent reinforcement from playing the opposite role.

1. The difference in design service life

The design service life in reinforcement refers to the period of continuous use of a building. During this period, the structure does not require large-scale maintenance, and only normal maintenance is required to achieve the intended use function.

The design service life should comprehensively consider the aspects of durability, safety, economy, rationality, etc. There are different requirements in the seismic appraisal standard and the reinforcement design code.

In the seismic appraisal standard, the design service life is mainly distinguished based on the construction time of existing buildings and the adopted seismic design series of codes.

In the reinforcement design, the design service life is affected by the owner, reinforcement materials, and the remaining design service life of the original building.

Therefore, when there is a need for seismic reinforcement of buildings, the design service life should be comprehensively coordinated between the two to prevent the structure from failing to meet the seismic requirements after reinforcement.

2. The difference in reinforcement methods

In the reinforcement of bearing capacity, each reinforcement method pays more attention to the improvement of the bearing capacity of individual components. For example, in the bending member, the flexural bearing capacity and the shear bearing capacity can be improved by pasting carbon cloth and U-shaped hoop.

When strengthening the structure for seismic reinforcement, the focus should be transformed from individual components to strengthening the seismic performance of the entire component, avoiding the reinforcement of individual components or parts, causing other components or parts to become weak links.

On the other hand, seismic reinforcement can start from two aspects, one of which is to improve the bearing capacity of the structure, and the seismic performance of the structure can also be enhanced by improving the deformation capacity of the structure.

This may cause the same method to perform differently in bearing capacity reinforcement and seismic reinforcement. For example, sticking carbon fiber cloth to concrete walls has basically no effect on the bearing capacity reinforcement, but it can improve the seismic performance by increasing the ductility of the wall.

In other words, we should pay attention to the difference between the two in the choice of method.

3. Similarities between bearing capacity and seismic reinforcement

From the perspective of building structural reinforcement, various reinforcement methods used for bearing capacity reinforcement can be used in seismic reinforcement, and the reinforcement process is basically similar.

Whether it is strengthening the bearing capacity of the structure or the seismic strengthening, the identification of the original structure is an important reference and should be strictly carried out in accordance with the requirements of the code.

The selection of construction technology should be based on the actual situation on the site, select an appropriate method, and select a professional construction team for reinforcement treatment.

To sum up, in the building structure reinforcement, the bearing capacity reinforcement and the seismic reinforcement have the same and different places. This is to be noted. The bearing capacity reinforcement and the seismic reinforcement should not be stepped on the minefield of the building structure reinforcement.

For any building structure reinforcement, the level of the reinforcement construction team directly affects the effect of the reinforcement. Therefore, it is necessary to choose a professional reinforcement company to ensure the quality of the reinforcement project.