Al Menaa Sports Complex in Basrah, Iraq. Courtesy HOK.
Thornton Tomasetti is providing structural design and façade engineering services for a soccer stadium for the Al Menaa Sports Complex. The new stadium will accommodate 30,000 spectators and will include VIP premium suites and press spaces at the west side of the structure. The complex will include two training fields, support buildings and a parking area.
The primary structural system of the seating bowl consists of cast-in-place concrete frames that are spaced on radial grid lines approximately 12 meters on center around the stadium bowl and bear on a pile foundation.
The canopy structure consists of a 29,600-square-meter PTFE tensile membrane cable roof structure comprised of 48 steel masts equally spaced around the perimeter of the seating bowl structure. The tri-chord shaped steel masts are comprised of three steel pipe chords. A 360-degree, 915 millimeter diameter steel pipe funicular-shaped outer compression ring (located four meters above the top seating row) runs continuously around the structure connecting the steel mast. The upper and lower radial suspension cables extend from the mast to an inner looped tension ring comprised of eight steel cables. The upper suspension cable at the top of the mast is resisted by a single backstay cable tiedown that terminate into the foundation. The mast base and stay cable tiedown is founded on a pile cap on top of an auger-cast pile foundation.
The 48 tri-chord serpentine-shaped steel pipe trusses span from each mast, sweeping horizontally to express movement, to the inner tension ring and then cantilever beyond up to 10.5 meters forming the forward span; the trusses also cantilever beyond mast and back of seating bowl creating a backspan. The standard translucency ridge and valley tensile membrane is formed by the tri-chord trusses bottom chords and valley cables. A high translucency membrane provides closure between the tri-chord truss bottom chords creating a clerestory effect.
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