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Applicability of different retrofitting methods
What are the main methods of structural strengthening? What is the difference between the applicability of structural strengthening methods?
It is suitable for reinforcement of beam, slab and column, which is flexural, shearing, pulling and pressing. It is suitable for the reinforcement of dynamic components and curved surfaces. When the reinforced component used in the compression member should be surrounded and bonded, the strength of the reinforced concrete member should not be lower than C15.
6.2. Bonded steel plate reinforcement
It is suitable for bending, shearing, pulling and pressing of beam, slab and column members bearing static force. Additional reinforcement measures should be added when reinforcement is used for compression and bearing large dynamic components. For example, setting up 2 reinforcement bolts per 100mm or beams and perforated plates. The strength grade of reinforced concrete should not be lower than C15.
6.3. Wrapped steel plate reinforcement
It is suitable for bending, shearing, pulling and pressing of beam, slab and column members bearing static force. Additional reinforcement measures should be added when reinforcement is used for compression and bearing large dynamic components. For example, setting up 2 reinforcement bolts per 100mm or beams and perforated plates. The strength grade of reinforced concrete should not be lower than C15.
6.4. Chemical fixing
It is applicable to the connection and length of the reinforced concrete structure and other components, or to increase the force of the reinforced bar. When the base material is a plain concrete or rock, the length of the anchorage of the rebar should be determined by a special test. The strength grade of base material concrete should not be lower than C20.
6.5. Chemical bolt
It is applicable to the anchorage of unstructured components, non important components, utensils and concrete (such as air conditioning pipes, fixed base of equipment). The strength grade of base material concrete should not be lower than C20. 6.6. crack chemical grouting is suitable for restoring the integrity and function of the cracked component, and blocking the erosion of concrete and steel by other media.
6.6. Crack grouting reinforcement
It is suitable for restoring the integrity and function of the cracked component and blocking the erosion of concrete and steel by other media.
6.7. Repair and reinforcement of structural adhesive
It is suitable for the repair of holes, pits and cross sections of concrete and masonry components.
6.8. Prestressing reinforcement
It is suitable for beam and slabs, columns to be strengthened by bending, pulling and pressing. The stress lag is less, and the coordination work is good.
6.9 Enlargement of cross section
It is suitable for the structure which is insensitive to the increase of self weight and the change of appearance.
6.10. Additional support and reinforcement
Applicable to the structure is not high on the use of space, appearance requirements.
6.11. Protection and reinforcement
The structure glue is painted on the surface of the concrete to prevent the carbonization, corrosion protection and improve the durability of the components.
6.12. Winding reinforcement
The annealed steel wire is wound to the compression member, so that the concrete is subjected to additional ring constraint, thus improving its ultimate bearing capacity and ductility. The effect is similar to that of winding fiber material.
6.13 The scope of application of glued glass fiber and basalt fiber reinforcement
It is suitable for reinforcement of beam, slab and column, which is flexural, shearing, pulling and pressing. It is suitable for the reinforcement of dynamic components and curved surfaces. When the reinforced component used in the compression member should be surrounded and bonded, the strength of the reinforced concrete member should not be lower than C15.
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High strength, unidirectional carbon fiber wrap pre-saturated to form a carbon fiber reinforced polymer (CFRP) wrap used to strengthen structural concrete elements.
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