Client Name: Arriyadh Development Authority
Principal Contractors: Saudi Oger, Cleveland Bridge, Freyssinet and Mekano4
Contractor: Saudi Oger Limited
Services provided by Buro Happold
Bridge engineering, ground engineering and Site supervision
Short listed for Structural Awards 2013
A delightfully simple scheme – demonstrating how an elegant, slender structure can be created within an awkward and constrained site. It is an excellent solution, with fine details throughout, perfectly matched to this modern city.
The King Abdul Aziz Flyover supports a new highway interchange in the centre of Riyadh, Kingdom of Saudi Arabia. Designed to blend harmoniously with its modern surroundings, this elegant viaduct has a steel arch spanning 83 meters as its main feature, with a post-tensioned voided slab for the remainder length. The single tied arch has a multi-facetted cross-section, giving it good stability and a very delicate appearance. Much of the design is constrained by the existing infrastructure and services, but the team still manages to produce a wonderful bridge.
The flyover carries vehicular traffic on the King Abul Aziz road over King Abdullah road in the center of Riyadh in the Kingdom of Saudi Arabia. It will carry six lanes of traffic, three in each direction.
The flyover consists of a main steel arch 81.5 meters span over King Abdullah Road with two approach multi-span bridges each comprising 5 spans (25 meters,30 meters,30 meters,30 meters,25 meters). The total length of the elevated structure is 361.5 meters; the approach spans comprise post-tensioned voided deck slab pre-stressed.
In both the longitudinal and transverse directions. The piers support the voided deck via two bearings positioned 3.5 meters from the bridge center line. A span-by-span method of construction is proposed for the
Approaches. With the exception of the first and last span, the spans approximately start at a fifth span point and extend to the fifth span point of the next span The central span is an 81.5 meters tied arch comprising a fabricated steel box girder with an orthotropic steel deck system consisting of closed longitudinal ribs and decking plates. The Steel deck is supported by cable system suspending from a Single fabricated steel arch. The arch is supported at either End by a pier, which also supports the approach deck, via
Two independent bearings positioned 3.5 meters from the bridge center line.
The flyover will be designed to KSA standards in conjunction with ASHTO LRFD for all concrete elements and BS 5400 for steel work design.