The methods of reinforcing the frame structure are mainly divided into the following three types:
(1) Seismic reinforcement methods to increase the strength of structures
When we use the method of increasing the strength, its advantage is that after the component is reinforced, its strength and rigidity are significantly strengthened. The disadvantage is that the deformation ability of the structure is obviously reduced. Through this development trend, we can get that the possibility of brittle failure of structures is greatly increased. Therefore, this reinforcement method requires that the possible increase in seismic load is significantly lower than the increase in seismic strength after the frame structure is reinforced, so that the safety factor of the structure is guaranteed and a firm reinforcement effect is achieved.
(2) Seismic reinforcement method to increase the deformation capacity of the structure or component
This method includes indirect method and direct method.
Direct method: In the event of an earthquake that we can expect, under the deformability and destructive capacity, when the structure cannot meet its requirements, it can be reinforced by directly strengthening the deformability of the structure to make the structure deformable Get promoted. However, the direct method can only improve the deformation ability of the structure, but the rigidity and strength of the structure cannot be improved.
Indirect method: If the deformation of the building structure is large under the action of an earthquake, the direct method cannot make the structure meet the requirements at all. If the hidden danger disappears, or because the structure itself has a strong deformability, the direct method cannot obtain a significant reinforcement result, then the indirect method can be used. The indirect method can reasonably increase the shear yield strength of the structure. The elastic-plastic deformation of the building under the action of an earthquake is within the limit value. If the indirect method is used for reinforcement, the deformation capacity of the structure will not decrease after reinforcement.
(3) Seismic reinforcement method that improves the ductility and strength of the structure at the same time
When the frame structure has poor ductility and insufficient strength under the action of an earthquake, methods that can improve these two aspects at the same time can be adopted for reinforcement, so that the seismic capacity of the structure can be guaranteed. After the structure is reinforced, not only the deformation capacity is increased, but the strength can also be improved. For reinforced concrete structures, there are many ways to repair and strengthen, as follows
① Shotcrete reinforcement method
②Reinforcement method with pasted steel plate
③Enlarged cross-section reinforcement method
④Additional fulcrum reinforcement method
⑤ Externally bonded steel reinforcement method
⑥External prestress reinforcement method
⑦Reinforce method of pasting fiber material.
| Reinforcement method | Advantage | Shortcoming | Application |
| Enlarged section reinforcement method | Simple construction process, wide application | The long construction period, heavy wet work workload and long maintenance time will have a certain impact on life and production. | Concrete components such as beams, slabs, columns, walls, foundations, roof trusses, etc. |
| External bonding steel reinforcement method | The construction is simple, the period is short, and the section size of the components does not increase much. | Poor fire resistance and fire resistance | Concrete columns, beams, trusses and web members. |
| External prestress reinforcement method | The construction period is short, the cross-section of the component is not increased, and the cost is low. | Higher technical requirements and higher environmental requirements. | Beams, slabs, columns and trusses with small cross-sections and high stress. |
| Reinforcement method of pasted fiber material | High strength, light weight, convenient construction, short cycle, durability and corrosion resistance. | The cost is high and the technical requirements are high. | Bending and tension members, etc. |
| Sticking steel plate reinforcement method | Rugged, fast construction, simple and lightweight, flexible and diverse, economical and reasonable. | It has poor fire resistance and corrosion resistance and high technical requirements. | Reinforcement of general bending and tension members, and medium and light duty crane beams. |
| Additional fulcrum reinforcement method | Simple and reliable | Have a certain impact on the original structure space | Suitable for reinforcement of concrete structures such as beams and slabs where specific conditions permit |
| Shotcrete reinforcement method | Good adhesion, durability, good integrity, fast speed and high quality | The construction thickness should not be controlled, the surface is uneven, and the working conditions are poor | Suitable to fit any shape of reinforcement surface and large area reinforcement |
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