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

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