AMONTAY BRIDGE RETROFITTING PROJECT

Location: Davao, Philippines
Client: DPWH Davao Regio

1. PROJECT PROFILE

1.1 Background

The Amontay Bridge is a critical infrastructure asset connecting [specify barangays/municipalities], serving as a key route for transportation, commerce, and emergency services. Constructed in [year], the bridge has experienced structural deterioration due to aging, increased traffic loads, and environmental factors (e.g., flooding, seismic activity). Retrofitting was prioritized to enhance safety, extend service life, and comply with updated Philippine design standards (e.g., DPWH Bridge Design Guidelines, AASHTO).

2. DESIGN ANALYSIS

2.1 Existing Condition Assessment

• Structural Deficiencies: Cracks in piers, corrosion of reinforcement, uneven settlement

• Seismic Vulnerability: Rated as Zone 4 (high seismicity) per PHIVOLCS guidelines.

2.2 Retrofitting Strategies

Substructure Reinforcement

• Piers: Fiber-reinforced polymer (FRP) wrapping to enhance shear capacity.

• Deck Strengthening: Carbon fiber-reinforced polymer (CFRP) laminates applied to tensile zones.

3. FINAL WORKS

4.1 Construction Highlights

Substructure reinforcement and FRP installation 

4.2 Materials Used

• Concrete: Grade 40 MPa for critical members.

• Polymers: CFRP sheets (Wolfix WFC-300).

4.3 Challenges & Solutions

• Monsoon Delays: Accelerated curing techniques and weather-resistant materials.

4.4 Post-Project Evaluation

• Load testing confirmed 120% of design capacity.

• Post-construction surveys indicated 95% satisfaction from local stakeholders.