📋 Case Study

Post-Tensioned Office Building in Dubai

Minimizing slab thickness to reduce foundation loads while controlling deflection and cracking

🏗️ Project Overview

8-story flat-plate office structure on weak sand with high groundwater table

🎯 Challenge

Minimizing slab thickness to reduce foundation loads while controlling deflection and cracking

🔧 Design Approach

Banded post-tensioning with hybrid mild steel reinforcement; long-term camber prediction using EC2 Annex B

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Effective Prestress Loss

Δf_p = f_pi × (1 − Σlosses%)

Result: 18.4%

Drives final compressive stress and cracking control

Time-Dependent Deflection Ratio

δ_long / δ_immediate

Result: 2.1

Critical for cladding tolerance and floor flatness

📊 Results

Slab thickness reduced from 300 mm to 240 mm; crack widths maintained < 0.2 mm over 5-year monitoring

💡 Lessons Learned

• •Grouting quality directly impacts long-term loss predictions
• •Flatness tolerances require early-stage shoring removal sequencing

✅ Key Takeaways

• 1Grouting quality directly impacts long-term loss predictions
• 2Flatness tolerances require early-stage shoring removal sequencing