Capital Gate has been built to lean 18 degrees westwards – more than four times that of the world famous Leaning Tower of Pisa – and, earned the Guinness recognition after rigorous evaluation by the Awards Committee since January 2010, when the exterior of the 160-metre (524.9 ft), 35-storey tower was completed.Commenting on CAPITAL GATE’s record-breaking achievement, His Excellency Sheikh Sultan Bin Tahnoon Al Nahyan, ADNEC’s Chairman said: “CAPITAL GATE is a landmark development for Abu Dhabi and with this recognition the tower takes its place among the world’s great buildings. It is a signature building which speaks to the fore-sight of the emirate”. The Capital Gate floor plates are stacked vertically up to the 12th storey after which, they are staggered over each other by between 300mm to 1400mm giving rise to the tower’s dramatic lean. The Capital Gate tower features other innovative construction techniques including the world’s first known use of a ‘pre-cambered’ core, which contains more than 15,000 cubic metres of concrete reinforced with 10,000 tons of steel. The core, deliberately built slightly off centre, has straightened as the building has risen, compressing the concrete and giving it strength, and moving into (vertical) position as the weight of the floors has been added.
In June 2010, the Guinness Book of World Records certified Capital Gate as the “World’s furthest leaning man-made tower. The new record shows that the Capital Gate tower has been built to lean 18 degrees westwards; more than four times that of the Leaning Tower of Suurhusen. Investigation and evaluation, which was made by a Guinness appointed awards committee, started in January 2010, when the exterior was completed.
The gravitational pressure caused by the 18-degree incline is countered by a technique called “pre-cambered core”, using a core of concrete reinforced with steel, with the core deliberately built slightly off-center. It is also anchored to the ground by 490 piles which are drilled 20–30 meters underground