Combined with the characteristics and technical requirements of bridge reinforcement, the factors that affect the selection of bridge reinforcement schemes can be summarized as follows.

The technical feasibility of the bridge reinforcement scheme.

• Whether the adopted reinforcement scheme is advanced in technology;
• The selected scheme has been verified by abundant engineering practice, proving that its technology is mature.
• The selected reinforcement scheme is compatible with the need for reinforcement of the structure.
• The selected reinforcement scheme is compatible with the specific conditions of the structure.

The effect of the bridge reinforcement scheme is reliable.

It is mainly analyzed whether the reinforcement effect reached by the reinforcement scheme can meet the requirements.Each reinforcement scheme has a certain scope of application, but the reinforcement of the scheme should meet the functional requirements of the bridge, including strength, stiffness and stability.Whether the reinforcement plan can meet the requirements of the coordination between the old and new structures, and whether the scheme can minimize the adverse effects on the original structure.

• Strength requirements
• Stiffness requirement
• Stability requirements
• Anti dynamic requirements
• Durability requirements
• Requirements for the coordination of new and old structures
• No adverse effect on reinforced components
• Ductility requirements

The economic rationality of the bridge reinforcement scheme.

It mainly means that the cost and duration of the structural reinforcement scheme should be able to achieve low cost and suitable construction period under the premise that the reinforcement effect is reliable. In addition, the maintenance cost that may be spent after reinforcement is also fully considered.

• The cost of strengthening
• Strengthening the required period of time
• The use of the original structure
• The cost of maintenance required after reinforcement

The construction of the bridge reinforcement scheme is convenient.

As we all know, because of different construction methods, construction procedures, construction equipment and so on, the difficulty of construction is obviously different. Therefore, the proposed scheme should be simple in technology, less occupied by the site, suitable for the type of reinforced structure, and satisfying the requirements of the construction unit.

• The complexity of strengthening construction technology
• Limitations of reinforcing construction site (whether it affects navigation, etc.)
• Strengthening the level of the construction unit