Fiber Sheet Jacketing Reinforcement Method
A&P Seismic Reinforcement Construction Method
Outline
It achieves outstanding cost-effectiveness with
ARAMID fiber and High elongation fiber
The A & P Seismic Reinforcement Construction Method uses aramid fiber which has high rigidity and is widely used for repairing and reinforcing concrete, and high-elongation fiber sheet (PET fiber or PEN fiber), which has excellent high elongation, as reinforced concrete columns. It is a construction method in which FRP is used for the members and wound up to reinforce the reinforced concrete bridge. By effectively using the characteristics of each of the two types of fiber sheets, it is possible to achieve excellent seismic retrofitting while significantly reducing construction costs compared to conventional seismic retrofitting methods.
High Elongation Fiber Sheet can be applied to reinforcement section against large deformation of the top and bottom pillar, and ARAMID Fiber Sheet to the middle section against shear reinforcement.
Characteristics
- The seismic performance of concrete rod members can be satisfied with “seismic performance II” for level 2 and seismic motion spectrum 2.
- No large machine is required for construction. It can be used for seismic reinforcement work in a narrow space and has excellent workability.
- The size increase of the pillar part after construction is about 10 mm to 30 mm for each of the paint finish and the fireproof finish. There is almost no weight increase.
- Effective use of two types of fiber sheets enables seismic reinforcement at the same low cost as steel sheet jacketing work (see the figures below) * Steel sheet jacketing depending on the performance and shape of the concrete rod member before reinforcement. It may be more expensive than the construction method.
800×800mm cross section：pw=0.21%, σn=1.0N/mm2
1,000×1,000mm cross section：pw=0.17%, σn=1.0N/mm2
Relation between “Estimated direct construction cost” and “Shear span / cross-sectional height” of A & P seismic reinforcement method
Main materials
High elongation fiber sheet
Excellent high elongation greatly improves low toughness of reinforced concrete column members
High elongation fiber sheet, Product number / standard
| Product No. | Proof stress （kN/m） |
Nominal strength （N/mm2） |
Young’s modulus （kN/mm2） |
Elongation at break （％） |
Weight per area （g/m2） |
Thickness （mm） |
|
|---|---|---|---|---|---|---|---|
| PET fiber sheet | PET600 | 600 | 740 | 10±1 | 7％ or more | 1,161 | 0.841 |
| PET900 | 900 | 1,742 | 1,262 | ||||
| PEN fiber sheet | PEN600 | 600 | 790 | 15±2 | 5％ or more | 1,158 | 0.848 |
| PEN900 | 900 | 1,737 | 1,272 |
Aramid fiber sheet
Flexible and tough non-conductive, non-magnetic, high cut-resistance reinforcing fiber sheet
Aramid fiber sheet Product number / standard
| Product No. | Proof stress （kN/m） |
Nominal strength （N/mm2） |
Young’s modulus （kN/mm2） |
Elongation at break （％） |
Weight per area （g/m2） |
Thickness （mm） |
|
|---|---|---|---|---|---|---|---|
| Aramid1 fiber sheet | AW400 | 400 | 2,100 or more | 118±15 | 1.8 | 280 | 0.193 |
| AW600 | 600 | 415 | 0.286 | ||||
| AW900 | 900 | 623 | 0.43 | ||||
| AW1200 | 1,200 | 830 | 0.572 | ||||
| Aramid2 fiber sheet | AT400 | 400 | 2,400 or more | 78±15 | 3.0 | 235 | 0.169 |
| AT600 | 600 | 350 | 0.252 | ||||
| AT900 | 900 | 525 | 0.378 | ||||
| AT1200 | 1,200 | 700 | 0.504 |
Other application
- Seismic reinforcement for railway viaduct pillars members
- Seismic reinforcement for construction structure pillars members
- Rigid frame bridge pier of road bridge
Related catalog download
Related products / construction methods
concrete structure / Continuous fiber sheet reinforcement method / disaster recovery