Project Profile

• Title: Seismic Retrofitting of Didipio Gymnasium Using FRP 600gsm
  Location: Didipio, Nueva Vizcaya, Philippines
  Scope:

  • Structural reinforcement of 12 load-bearing columns using FRP 600gsm carbon fiber sheets.

  • Repair of corroded roof beams and slab edges.

  • Foundation stabilization in high-moisture zones

• 

Design Analysis

Structural Issues Identified:

1. Columns: Cracks and reduced load capacity due to aging and seismic vulnerability.

2. Beams: Excessive deflection under increased machinery loads.

3. Floor Slabs: Surface deterioration from chemical exposure in production zones.

4. Foundations: Minor settlement in high-moisture areas.

Retrofitting Strategy:

• Columns:

  • Wrapped 25 critical columns with FRP 600gsm carbon fiber sheets (WFC-600 of Wolfix)(2 layers, 70% fiber volume) to restore axial/shear capacity.

  • Design Basis: NSCP 2015 Seismic Code & ACI 440.2R-17 for FRP.

• Beams:

  • Applied FRP U-wraps to beam ends to mitigate shear failure risks.

  • Installed steel plate bonding in high-stress zones for hybrid reinforcement.

• Slabs/Foundations:

  • Repaired slabs with epoxy injection + FRP overlays in corrosive zones.

  • Stabilized foundations via polyurethane grouting

Conclusion

• FRP 600gsm retrofit effectively restored structural integrity, meeting PH seismic standards (PNS 2146:2022).

• Key Results:
  ✔️ 100% columns passed post-retrofit load tests.
  ✔️ Project cost 20% lower vs. traditional steel jacketing.
  ✔️ Zero disruption to factory operations