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Common structural strengthening methods for beam, column, slab: sticking steel plate, bonded FRP composite materials, post installed anchoring, enlarged section
Slab strengthening
Cast-in-place plate
Prefabricated plate |
Sticking steel plate +d10 anchor bolt |
Bonding carbon fiber reinforced polymer FRP composites |
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New cast-in-place slab |
Post installed anchoring with injectable mortar + angle steel support, planting bar + shear reinforcement |
injectable mortar
Insufficient bearing capacity of column under normal pressure | Increase section, main reinforcement and stirrups. |
Wet method of externally bonded steel: modified epoxy adhesive infusion + protective coating (cement mortar plaster) | |
Continuous bonding of carbon fibers along the full length of the ground (circumferential girding) | |
Insufficient bearing capacity of inclined section under column compression | CFRP strengthening, the fiber direction should be perpendicular to the longitudinal axis of the column. |
Insufficient bearing capacity under large eccentric compression | CFRP strengthening, the fiber direction is aligned with the longitudinal axis of the column. |
Column ductility insufficient seismic strengthening | CFRP strengthening, the circular bonding and bonding fiber composite material forms the circumferential girth as the additional stirrup. |
Normal section reinforcement (water tower, water tank and closed structure) of tensile members | The fiber composite is externally bonded to the concrete surface of the tensile part, and the direction of the fiber is consistent with the tensile direction. |
The outer steel plate is on the concrete surface of the tensile part, and the direction of the steel plate is consistent with the direction of the pulled steel bar. | |
New cast-in-place column | Planting steel bar main reinforcement + shear reinforcement + stirrups. |
Insufficient bearing capacity of the beam moment | 1. enlarging the cross section to form the composite beam, planting the main reinforcement and the stirrup |
2. externally bonded steel | |
3. bonding FRP composites | |
4. sticking steel plate | |
Insufficient bearing capacity of the negative bending moment at the end of the beam | 5. bonding FRP composites |
6. sticking steel plate | |
7. grouting the end of the beam with armpit, adding the axillary inclined bars and stirrup | |
Insufficient shear bearing capacity of beam end and oblique section | 8. bonding FRP composite hoop |
9. stick steel plate hoop | |
10. add steel corbel | |
11. additional shear reinforcement | |
Adding concrete beams | 12. planting steel bars with positive and negative main reinforcement, and Liang Duan setting up steel corbel. |
Seismic strengthening
Insufficient column ductilit | Circumferentially bonded fiber composite material constitutes a circumferential bundle, as an additional stirrup |
Frame joints improve seismic construction measures | Beam end plate support |
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Part A (Epoxy): 20kg
Part B (Hardener): 10kg
Density:1.6±0.1g/cm³
Mix Ratio: Part A: Part B=2:1
Barrel A Size: 30*30*37cm
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Part A: Modified Epoxy (20kg)
Part B: Hardner(10kg)
Mix Ratio: A:B=2:1
Consumption Ratio: 0.2-0.3kg/sqm
Barrel A Size: 30*30
Weight: 200g/sqm
Thickness: 0.111mm
Density: 1.8g/cm³
Packing: 100 meters/roll
Width:100mm, 200mm, 300mm, 500mm or to be custo