Methods for reinforcing building structures include:

Direct reinforcement methods: Include methods such as increasing cross-sectional reinforcement, concrete replacement, external steel plate bonding, steel plate bonding, additional support point reinforcement, and prestressed reinforcement. These methods enhance the load-bearing capacity and stability of structures by increasing the cross-sectional area of structural members, replacing concrete, and bonding steel plates.

2. Indirect Reinforcement Method: Primarily includes adding supports and altering the structural system. Adding supports can significantly enhance the load-bearing capacity of the structure, while altering the structural system can reduce the stress on the original structure, improving the overall stability.

3. Composite Reinforcement Method: This method combines the advantages of direct and indirect reinforcement, commonly used for dealing with large and complex structures, such as bridges and buildings.

When reinforcing the structure of a building, various factors should be considered, such as the structural type, usage function, safety, and economy. At the same time, relevant regulations and standards should be followed to ensure construction quality and safety.