Beijing Daxing Airport – Large‑Span Prestressed Concrete Structure
Beling Daxing Interational Arportis a Cass 4Finternational aviation hub located at the junction of Beling Munidipality andLangfang City Hebei Province China. Itwas put into operation on September 25. 2019, and is positioned as a’new driver of nationaldevelopment: The terminal building covers an area of 780,000 square meters, with a designed annual passenger throughput of 72mlion ftis renowned foris’ phoenx spreadng is wngs architectural shape and a number of word cass innovative designs ourcompany is responsible for providing the anchorage devices for the airport, with a contract amount of 634198.4 yuan.
| Construction Challenge | Description | Prestressed Solution |
|---|---|---|
| Ultra‑large span & irregular form Complex geometry |
Terminal building has a star‑shaped layout with long‑span curved steel‑concrete composite structure; conventional reinforcement alone cannot control deflection and cracking. | Use bonded and unbonded post‑tensioning in mega‑beams and floor slabs; optimize tendon profile to match structural curvature, providing active load‑balancing and crack control. |
| High seismic zone requirement Seismic resilience |
Beijing is in a high‑seismic region; the airport must maintain functionality after a major earthquake, demanding ductile yet stiff connections. | Apply prestressed energy‑dissipating braces in core walls and post‑tensioned moment frames; improve self‑centering capacity while reducing residual drift. |
| Massive foundation & raft slab Thermal & shrinkage cracking |
Raft slabs and foundation beams up to 2.5 m thick are prone to early‑age cracking from hydration heat and shrinkage. | Incorporate post‑tensioned tendons in raft slabs (unbonded system) to impose pre‑compression, mitigating thermal and shrinkage cracks without excessive reinforcement. |
| Restricted construction time Fast‑track schedule |
The project required simultaneous multi‑zone erection; traditional rebar cages and formwork were too slow. | Adopt precast prestressed double‑T units for secondary beams and parking decks; prefabrication parallel to substructure work, accelerating overall schedule by 30%. |
| Interference with MEP systems High‑density embedded services |
Mechanical, electrical, and plumbing (MEP) ducts conflict with conventional reinforcing steel and tendon layouts. | Use flat post‑tensioning slabs with unbonded strands; tendons can be placed around MEP openings, reducing beam depth and simplifying coordination. |
| Stringent durability & maintenance Long‑term corrosion protection |
Exposure to de‑icing salts (airside) and aggressive environment demands high durability. | Specify epoxy‑coated strands or fully grouted bonded tendons with corrosion‑inhibited grout; ensure complete encapsulation for 100‑year design life. |
✅ Solutions adopted for Beijing Daxing International Airport – one of the world’s largest prestressed infrastructure projects
Engineering challenges overcome through advanced post‑tensioning technology
Engineering challenges overcome through advanced post‑tensioning technology
