The role of building structure appraisal and strengthening and retrofitting work

In the process of building structure in use, the reliability and firmness of the original structure will be reduced. The main reason for this phenomenon is that in the process of design and construction, the building structure will undergo certain deformation, which reduces the reliability of the building structure. Therefore, in order to restore and strengthen the reliability of the building structure, construction workers need to strengthen the building structure. Reinforcing the building structure can effectively improve the stability of the building and reduce the displacement or deformation of the building structure during use. In addition, the local stability of the building can also be strengthened by strengthening the building structure. In turn, it can effectively improve the overall quality and safety, reduce the phenomenon of construction cracks during construction and use, and can fundamentally improve the durability of the building structure.

Building strengthening technology is mainly a technical activity based on the identification of the main structure of the building. Therefore, before the strengthening of the building, the construction personnel need to inspect the main structure of the building and provide corresponding inspection reports to provide accurate theoretical data for the subsequent strengthening. Judging from the actual strengthening work at present, the inspection link is often ignored by the construction personnel, and most construction personnel are not fully aware of the importance of structural appraisal. Generally speaking, my country's building structure appraisal and strengthening technology have not been fully developed, and construction personnel need to be further strengthened.

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Relevant overview of structural strengthening and retrofitting technology

1 Specific content of structural strengthening

The main purpose of structural strengthening is to restore the building structure and strengthen the reliability of the building structure, and further enhance the overall stability of the building. The work content of structural strengthening is generally divided into the following points:

(1) Improve the bearing capacity of building structural members.

(2) Strengthen the rigidity of structural members and reduce the deformation and displacement caused by the influence of load on the structural members.

(3) Strengthen the stability of components and reduce the degree of structural cracks at the same time, and fundamentally improve the durability of structural components.

In addition, the components that have passed the structural appraisal should be strengthened and reinforced, and during this process, the construction personnel should carry out corresponding work strictly in accordance with the strengthening rules. Here, construction workers need to pay attention to one point. When carrying out structural strengthening work, they should comprehensively consider the economic effects of strengthening technology to prevent unnecessary removal or replacement, and prevent the economic benefits of construction enterprises from being damaged.

At this stage, the more common strengthening technologies mainly include bonded steel and bonded carbon fiber technologies. Among them, the bonding steel strengthening technology usually uses high-strength steel plates with a thickness of 3-10mm to improve the strength and rigidity of the project. Its advantage is that the construction operation is relatively simple and will not have a large impact on the overall appearance and use effect of the project. At the same time, the thickness of the bonded steel strengthening technology is relatively small due to the small increase in the weight of the structural layer. The sticky carbon fiber technology uses carbon fiber materials to reinforce the building structure. Carbon fiber has the advantages of being flexible and easy to cut. It can not only increase the strength and rigidity of the building structure, but also improve its crack resistance. In addition, the construction operation is relatively simple, its own weight is light, and the impact on the engineering structure is minimal, and it is widely used in a variety of engineering structures.

2 Key points of structural strengthening

First of all, the construction staff should close this key to carefully select the strengthening work. To a large extent, the choice of strengthening work plan will have a greater impact on the quality of strengthening. For example, it is not advisable for construction personnel to use longitudinal strengthening for components with excessive cracks and sufficient bearing capacity. Once the strength of the longitudinal strengthening is increased, the original cracks will not be reduced, but will even increase. In the face of this situation, the most effective solution is that the construction personnel should promptly adopt the method of adding prestressed steel strengthening or external prestressing support to reduce construction cracks.

In addition, for structural members whose bearing capacity is insufficient but the actual strengthening has reached or exceeded the stiffness of the super strengthening, adding strengthening in the tension zone basically does not provide strengthening. Secondly, the strengthening design unit must have certain qualifications. It mainly includes three parts: checking and calculating the bearing capacity of strengthening components, processing components and drawing construction drawings. In other words, the strengthening design unit must have the corresponding strengthening technology and use it flexibly, otherwise it will not be hired.

Conclusion

In summary, it is very necessary to carry out structural inspection and strengthening of building structures. For this reason, the design and construction personnel of construction projects should strengthen their own appraisal level in time, and solve the problems detected in time. In addition, it is necessary to continuously carry out comprehensive exploration work on strengthening technology to provide corresponding guarantee for the long-term development of my country's construction industry.