The structural strengthening works are aimed at the existing projects, which are subject to objective conditions, and reinforce the design and construction according to the existing conditions.

The design and construction of structural strengthening are different from the new construction

1. The reinforcement works are aimed at the existing projects, which are subject to objective conditions, and reinforce the design and construction according to the existing conditions.
2. reinforcement works are often constructed on condition that no production is stopped or as few as possible to stop production, which requires fast construction speed and short construction period.
3. The construction site is narrow and congested, often restricted by production equipment, pipelines and original structures and components. Large construction machinery is difficult to play a role.
4. Construction often has adverse effects on the original structure and components.
5. Construction is often staged and phased, and will be interrupted due to various disturbances.
6. The workload of cleaning and demolition is often large, and the project is cumbersome and complex, and there are often many unsafe factors.
7. The design includes the checking calculation of the original structure and the calculation of the reinforced structure design. It is required to consider the balance of the strength, stiffness and life of the new and old structures, and the coordination of the new and old structures.

There are many different ways to reinforce structural members, but they abide by the following principles:

1. The principle of pre appraisal and reinforcementThe principle of overall effect of structural system
2. Optimization principle of reinforcement scheme
3. The principle of using it as much as possible
4. The principle of combining with seismic fortification
5. The selection and value principle of material
6. Principle of load value
7. Checking principle of bearing capacity
8. Other principles