New Convention Center: Post-Tensioning Systems Convince Owners
Beginning in 2011, Doha welcomed international business partners in a special building: the Qatar National Convention Centre (QNCC). The conference center is being built in the middle of Doha’s Education City, Qatar’s central science and technology park.
In addition to a 40,000m² exhibition space, which is split into 9 halls, and a conference hall seating 4,000 people, the convention center will also contain 52 meeting rooms. The QNCC is being built as an environmentally friendly building, according to internationally recognized LEED certification criteria. For example, approximately 12% of the building’s energy supply is produced by solar cells on the center’s roof.
Thanks to its unusual façade, the congress center has already become a new landmark of the city. As a symbol for the Sidra tree native to Qatar, world famous Japanese architect Arata Isozaki designed a tree-like steel structure for the building’s façade. The Sidra tree is deeply rooted in Qatar’s culture. In the shade of this desert tree, meetings were held by Bedouins and scholars, and its fruit and leaves were used in traditional medicine.
Originally, the owners were going to use traditional construction methods, but then were convinced of the advantages of posttensioned construction and the DYWIDAG Post-Tensioning System by the structural designer BW Gulf and by QACS.
As a result of the increased spans made possible by prestressed concrete, the architect achieves more freedom in design. Moreover, the dimensions of structural components can be reduced and the required amount of reinforcement is decreased, which leads to savings in construction material and costs. In addition, in prestressed concrete structures, the deflection of the beams and slabs are significantly reduced and cracks in concrete are almost eliminated. This is of utmost importance for the durability of the structure.
The DYWIDAG Strand Post-Tensioning System was used for all 71 beams necessary for this project. With a depth of 1.35m and a width of 45cm, the beams, which were designed by BW Gulf Consulting Engineers, were up to 53m long.
Qatar Australian Construction Systems W.L.L. (QACS), a partner company of DSI, supplied a total of 160 9x0.5" Strand Tendons with 5909 MA Anchorages and Bond End Anchorages. The strand had a total weight of approximately 30t and the tendons were supplied preassembled in corrugated steel duct. The post-tensioning systems were tensioned using a DYWIDAG HoZ 1.700 jack.