minimizing distortion | pnu’s apm unsymmetrical beams The Unsymmetrical Precast Pre-Tensioned Beams For The Apm Bridge At Princess Nora Bint Abdulrahman University by Essam Ayoub, Senior Bridge Engineer; Gamal Helmy, Bridge Department Head; Charles Malek, Director of Structures Department Figure File • Alignment length: 12.1 km • Concrete volume: 146,500 m3 • Construction period: • Pre-casting = 8 months • Construction = 8 months • Guideway Bridge • Straight sections: 8,800 m • Curved sections: 3,300 m • Precast concrete elements • slabs: 7,500 m3 with total number of ≈ 8650 units • C beams: 23,000 m3 with total number of ≈ 660 units • Segments: 6,500 m3 with total number of ≈ 810 units • Parapets: 11,500 m3 with total number of ≈ 8500 units • Cast in situ concrete elements • Foundations: 43,000 m3 • Piers: 18,500 m3 • Topping slab & stitching: 24,500 m3 • Concrete sleepers: 12,000 m3 • Pre-stressing and ordinary reinforcement • Pre-stressing reinforcement for all elements: 1,750 t • Ordinary reinforcement for all elements: 32,000 t Main image The APM’s box girder bridge and piers. Inset, view of the APM and the Central Plaza, in the background minarets of the main mosque 2