Petronas Towers - Identical modern Wonder of the world

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The Petronas Twin Towers also known as the Petronas Towers or Twin Towers, in Kuala Lumpur, Malaysia were the world's tallest buildings, before being surpassed by the Taipei 101. However, the towers are still the tallest twin buildings in the world. The Petronas Towers is one of the seven forgotten modern wonders of the world and one of the seven wonders.

Designed by Argentine-American architect Cesar Pelli, the Petronas Towers were completed in 1998 and became the tallest buildings in the world on the date of completion. The 88-floor towers are constructed largely of reinforced concrete, with a steel and glass facade designed to resemble motifs found in Islamic art, a reflection of Malaysia's Muslim religion.

They were built on the site of Kuala Lumpur's race track. Because of the depth of the bedrock, the buildings were built on the world's deepest foundations. The 120-metre foundations were built by Bachy Soletanche, and required massive amounts of concrete. In an unusual move, a different construction company was hired for each of the towers.

Due to a lack of steel and the huge cost of importing steel, the towers were constructed on a cheaper radical design of super high-strength reinforced concrete. High-strength concrete is a material familiar to Asian contractors and twice as effective as steel in sway reduction; however, it makes the building twice as heavy on its foundation than a comparable steel building. Supported by 23-by-23 metre concrete cores and an outer ring of widely-spaced super columns.

The towers use a sophisticated structural system that accommodates its slender profile and provides from 1300 to 2000 square metres of column-free office space per floor. Spanning 17 acres below the building has the KLCC park with jogging and walking paths. a fountain with incorporated light show, wading pools, and a children's playground.

The towers feature a skybridge (constructed by Kukdong Engineering & Construction) between the two towers on 41st and 42nd floors, which is the highest 2-storey bridge in the world. The bridge is 170 m above the ground and 58 long, weighing 750 tons. The same floor is also known as the podium, since visitors desiring to go to higher levels have to change elevators here.

The skybridge also acts as a saf├ęty device, so that in the event of a fire or other ernergency in one tower, tenants can evacuate by crossing the skybridge to the other tower.

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