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History and architecture

The Petronas Towers' structural system is a tube in tube design, invented by Bangladeshi-American architect Fazlur Rahman Khan.¹² Applying a tube-structure for extreme tall buildings is a common phenomenon.³⁴ 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.⁵ Another Islamic influence on the design is that the cross section of the towers is based on a Rub el Hizb, albeit with circular sectors added to meet office space requirements.⁶ The circular sectors are similar to the bottom part of the Qutb Minar.

The towers were designed by Argentine-American architect César Pelli. A distinctive postmodern style was chosen to create a 21st-century icon for Kuala Lumpur, Malaysia. Planning on the Petronas Towers started on 1 January 1992 and included rigorous tests and simulations of wind and structural loads on the design. Seven years of construction followed at the former site of the original Selangor Turf Club, beginning on 1 March 1993 with excavation, which involved moving 500 truckloads of earth every night to dig down 30 metres (98 ft) below the surface. The construction of the superstructure commenced on 1 April 1994. Interiors with furniture were completed on 1 January 1996, the spires of Tower 1 and Tower 2 were completed on 1 March 1996, 3 years after its construction was started, and the first batch of Petronas personnel moved into the building on 1 January 1997. The building was officially opened by the Prime Minister of Malaysia, Tun Dr. Mahathir bin Mohamad, on 31 August 1999.⁷ The twin towers were built on the site of Kuala Lumpur's race track. It was the tallest structure in Malaysia at the time of its completion.⁸ Test boreholes found that the original construction site effectively sat on the edge of a cliff. One half of the site was decayed limestone while the other half was soft rock. The entire site was moved 61 metres (200 ft) to allow the buildings to sit entirely on the soft rock.⁹ Because of the depth of the bedrock, the buildings were built on the world's deepest foundations.¹⁰ 104 concrete piles, ranging from 60 to 114 metres (197 to 374 ft) deep, were bored into the ground. The concrete raft foundation, comprising 13,200 cubic metres (470,000 cu ft) of concrete was continuously poured through a period of 54 hours for each tower. The raft is 4.6 metres (15 ft) thick, weighs 32,500 tonnes (35,800 tons) and held the world record for the largest concrete pour until 2007.¹¹ The foundations were completed within 12 months by Bachy Soletanche and required massive amounts of concrete.¹²

As a result of the Malaysian government specifying that the buildings be completed in six years, two construction consortia were hired to meet the deadline, one for each tower. Tower 1, the west tower (left in the top-right photograph) was built by a Japanese consortium led by the Hazama Corporation (JA Jones Construction Co., MMC Engineering Services Sdn Bhd, Ho Hup Construction Co. Bhd and Mitsubishi Corp) while Tower 2, the east tower (right in the top-right photograph) was built by a South Korean consortium led by the Samsung C&T Corporation (Kukdong Engineering & Construction and Syarikat Jasatera Sdn Bhd).

Early into construction a batch of concrete failed a routine strength test causing construction to come to a complete halt. All the completed floors were tested but it was found that only one had used a bad batch and it was demolished. As a result of the concrete failure, each new batch was tested before being poured. The halt in construction had cost US$700,000 per day and led to three separate concrete plants being set up on the site to ensure that if one produced a bad batch, the other two could continue to supply concrete. The sky bridge contract was completed by Kukdong Engineering & Construction. Tower 2 (Samsung C&T) became the first to reach the world's tallest building at the time.

When Tower 2 reached the 72nd floor, engineers discovered it was leaning about 25 millimeters off vertical – or nearly an inch. To correct the lean, the next 16 floors were slanted back 20 millimeters. Surveyors checked verticality twice a day until the building's completion.

Due to the huge cost of importing steel, the towers were constructed on a cheaper radical design of super high-strength reinforced concrete.¹³ 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 as a comparable steel building. Supported by 23-by-23 metre concrete cores¹⁴ and an outer ring of widely spaced super columns, the towers use a sophisticated structural system that accommodates its slender profile and provides 560,000 square metres of column-free office space.¹⁵ Below the twin towers is Suria KLCC, a shopping mall, and Petronas Philharmonic Hall, the home of the Malaysian Philharmonic Orchestra.

Notable events

• On 15 April 1999, Felix Baumgartner set the world record for BASE jumping (since broken) by jumping off a window cleaning crane on the Petronas Towers.¹⁶¹⁷
• Thousands of people were evacuated on 12 September 2001 after a bomb threat the day after the September 11 attacks destroyed the World Trade Center towers in New York City. Bomb disposal squads found no explosives in the towers, but they nevertheless evacuated the premises. Workers and shoppers were allowed to return three hours later, around noon. No one was hurt during the evacuation.¹⁸
• On the evening of 4 November 2005, a fire broke out in the cinema complex of the Suria KLCC shopping centre below the Petronas Towers, triggering panic among patrons. There were no reports of injuries. The buildings were largely empty, except the shopping mall, Suria KLCC, because of the late hour; the only people involved were moviegoers and some diners in restaurants.¹⁹
• On the morning of 1 September 2009, French urban climber Alain "Spiderman" Robert, using only his bare hands and feet and with no safety devices, scaled to the top of Tower Two in just under 2 hours after two previous efforts had ended in arrest.²⁰ In his first attempt on 20 March 1997, police arrested him at the 60th floor, 28 floors away from the "summit". His second attempt, on 20 March 2007, exactly 10 years later, was also stopped on the same floor, though on the other tower.²¹

Anchor tenants

Tower One is fully occupied by Petronas and a number of its subsidiaries and associate companies, while the office spaces in Tower Two are mostly available for lease to other companies.²² A number of companies have offices in Tower Two, including SapuraOMV Upstream (Sarawak) Inc., Huawei Technologies, AVEVA, Al Jazeera English, Carigali Hess, Bloomberg, Boeing, IBM, Khazanah Nasional Berhad, McKinsey & Co, WIPRO Limited, TCS, HCLTech, Krawler, Microsoft, The Agency (a modelling company) and Reuters.

Petronas Towers 1 & 2 Floorplan

(the given chart is the floor arrangement according to the level arrangement.)

Suria KLCC Mall Floorplan

Features

Suria KLCC

Main article: Suria KLCC

Suria KLCC is a 140,000 m2 (1,500,000 sq ft) upscale retail center at the foot of the Petronas Towers. It features mostly foreign luxury goods and high-street labels. Its attractions include an art gallery, an underwater aquarium and also a Science center. Boasting approximately 300 stores, Suria KLCC is touted as one of the largest shopping malls in Malaysia.²³ The Petronas Philharmonic Hall, also built at the base of the towers, is frequently associated with Suria KLCC's floorspace. During holidays or celebration days, Suria KLCC is the top spot to see the decorations especially at the main entrances and also in Centre Court. It also promotes the uniqueness and beauty of Malaysia's cultural diversity towards the visitors.

KLCC Park

Main article: KLCC Park

Spanning 17 acres (6.9 ha) below the building is the KLCC Park with jogging and walking paths, a fountain with incorporated light show, wading pools, and a children's playground.

Skybridge

The towers feature a double decker skybridge connecting the two towers on the 41st and 42nd floors, holding the record for the highest 2-story bridge in the world.²⁴ The skybridge also functions as a crucial design feature facilitating movement between the two towers during high winds.²⁵ The bridge is 170 m (558 ft) above the ground and 58.4 m (192 ft) long, weighing 750 tons.²⁶ The same floor is also known as the podium, since visitors going to higher levels have to change elevators here. Dynamic analyses were performed and iterated to support the final design by studying the structural behavior of the twin towers to time-varying loads such as earthquakes and wind.²⁷ The skybridge is open to all visitors, but tickets are limited to about 1,000 people per day, with around half available to be purchased online, and the other half obtained on a first-come, first-served basis. Petronas began selling tickets in 2010, eliminating free visits. Visitors can choose to opt for package one which is just a visit to the skybridge or go for package two to go to the skybridge and all the way to level 86.²⁸ Visitors are only allowed on the 41st floor as the 42nd floor can only be used by the tenants of the building.²⁹

The skybridge also acts as a safety device, so that in the event of a fire or other emergency in one tower, tenants can evacuate by crossing the skybridge to the other tower.³⁰ The total evacuation triggered by a bomb hoax on 12 September 2001 (the day after the September 11 attacks destroyed the twin towers of the World Trade Center in New York City) showed that the bridge would not be useful if both towers need to be emptied simultaneously, as the capacity of the staircases was insufficient for such an event.³¹ Plans thus call for the lifts to be used if both towers need to be evacuated, and a successful drill following the revised plan was conducted in 2005.

There is a two hinged arch that supports the skybridge with arch legs, each 51 metres (167 ft) long, that are bolted to level 29 of each of the towers.³² After being constructed on the ground, the skybridge was lifted into place on the towers over a period of three days³³ in July 1995.³⁴ Residing on the 41st and 42nd floors, the skybridge connects a conference room, an executive dining room and a prayer room.³⁵

Lift system

The main bank of lifts is located in the centre of each tower. All main lifts are double-decker with the lower deck of the lift taking passengers to even-numbered floors and upper deck to odd-numbered floors. To reach an odd-numbered floor from ground level, passengers must take an escalator to the upper deck of the lift.³⁶

There are 29 double-deck passenger elevators, but there are different sets that service certain floors of the towers, specifically two sets of six of these double-deck passenger elevators to floors 1–23 and 1–37 respectively. Another set of 5 passenger lifts transport passengers to the 41st and 42nd floors where they can switch lifts to reach the upper zones of the buildings, each double-deck passenger lift with the capacity of 52 passengers or, 26 passengers per deck. There are also 6 heavy-duty elevators for utility.

The lift system information of the Petronas Towers (does not include Suria KLCC Mall)

• PL7A-PL7D (Tower 1) & PL8A-PL8D (Tower 2) (Parking & Podium Passenger Lift): *P4,P3,P2,P1,C,G,1-4 (PL7A & PL8A non-stop at level 2M)*
• SL6 (Tower 1) & SL7 (Tower 2) (Parking & Podium Service Lift): P5-P1, 1, 2, 2M, 3–5 (SL7 non-stop at level 2M)
• PL14 (Tower 1) & PL15 (Tower 2) (Concert Passenger Lift): G,2,2M,3,4.
• A1-A6 (Tower 1) & A7-A12 (Tower 2) (Bank A Passenger Lift): G,M,8-23.
• B1-B6 (Tower 1) & B7-B12 (Tower 2) (Bank B Passenger Lift): G,M,23–37.
• CF1-CF2 (Tower 1) & CF3-CF4 (Tower 2) (Conference Shuttle Lift): 36,37,40–43.
• C1-C6 (Tower 1) & C7-C12 (Tower 2) (Bank C Passenger Lift): 41,42,44–61.
• D1-D3 (Tower 1) & D4-D6 (Tower 2) (Bank D Passenger Lift): 41, 42,61,69–83.
• E1-E3 (Tower 1) & E4-E6 (Tower 2) (Bank E Passenger Lift): 41,42,61–73.
• TE1-TE2 (Tower 1) & TE3-TE4 (Tower 2) (Upper Level Passenger Lift): 83,85,86.
• SH1-SH5 (Tower 1) & SH6-SH10 (Tower 2) (Shuttle Lift): G,41,42.
• S1-S2 (Tower 1) & S4-S5 (Tower 2) (Service Lift): P1,C,G,2–6,8–38,40–84.
• S3 (Tower 1) & S6 (Tower 2) (Lower Level Service Lift): P1,C,G,2–6,8–37.
• F1-F2 (Tower 1) & F3-F4 (Tower 2) (Fireman Service Lift): P1,C,CM,G,1–6,8–38,40–84,84M1,84M2,85,86. (F1 & F3 non-stop at Level 1)

Service building

The service building is to the east of the Petronas Towers and contains the chiller plant system and the cooling towers to keep the Petronas Towers at a comfortable temperature.

Ticketing system

In order to visit the Petronas Towers, visitors must first purchase tickets.

In popular culture

• The towers are prominently featured and mentioned by name in the 1999 film Entrapment, with numerous scenes filmed at the towers, with the climax set on the skybridge. CGI was used to add slums to the bottom of the towers.³⁷
• The towers appear in the first episode of the US TV series 24.
• Several scenes of the Bollywood film Don: The Chase Begins Again were also filmed in the Petronas Towers and its skybridge.
• In Part 1 of the Phineas and Ferb episode "Phineas and Ferb Save Summer!", the towers are visible during the musical number "Summer All Over the World".
• Eidos Interactive has twice used the towers for inspiration in their video games. In the 2002 Hitman 2: Silent Assassin, the Malaysia-based levels Basement Killing, The Graveyard Shift, and The Jacuzzi Job all take place in the Petronas Towers.³⁸ In 2010's Just Cause 2, the fictional Panau Falls Casino is based on the Petronas Towers.
• A 2002 episode of the animated series Jackie Chan Adventures titled "When Pigs Fly" (Season 3, Episode 6), features the towers.
• A 2002 episode of The Amazing Race 3 ("Why Did You Have to Take Your Pants Off?!") featured the Petronas Towers as part of a task in which the competing team had to have their photograph taken in front of the towers.³⁹ The towers were seen again 21 seasons later on an episode of The Amazing Race 24 ("Smarter, Not Harder").⁴⁰
• The towers made an appearance in the animated series Totally Spies! in an episode titled "Man or Machine".
• The opening of the 2010 film Fair Game had scenes with the twin towers along with the skyline of Kuala Lumpur.⁴¹
• A number of scenes for the 2012 Hong Kong-Chinese action film Viral Factor included shots of the twin towers.⁴²
• In the 2016 film Independence Day: Resurgence, the towers are dropped onto the London Tower Bridge by aliens, with a character commenting: "They like to get the landmarks".⁴³
• In the 2009 History Channel original program Life After People, the towers make an appearance in the episode titled "Bound and Buried", and it is stated that the towers would survive approximately 500 years without human maintenance, eventually collapsing from the weathering and erosion of Malaysia's tropical climate.
• The towers are seen on the cover of the 2005 album Controversy Loves Company by American pop punk band The Audition.
• The towers make an appearance in episode 46 of anime Jujutsu Kaisen as a means of shelter for Mei Mei and Ui Ui after escaping an offscreen battle with Kenjaku.
• The towers make an appearance in the 2020 film Bloodshot; Rising Spirit Technologies (RST) is stationed in Kuala Lumpur.

Gallery

See also

• Malaysia portal
• Architecture portal

• Petronas Tower 3
• The Exchange 106
• List of skyscrapers
• List of tallest buildings and structures in the world
• List of tallest buildings in Kuala Lumpur
• List of tallest buildings in Malaysia
• List of tallest freestanding structures in the world
• List of tallest twin buildings and structures
• Menara Telekom
• Merdeka 118
• Skyscraper Index
• Vanity height

External links

• Petronas Towers official website
• Petronas Tower 1 on CTBUH Skyscraper Center
• Petronas Tower 2 on CTBUH Skyscraper Center
• Petronas Towers at Structurae
• Introduction and Overview of the Petronas Towers
• Geographic data related to Petronas Towers at OpenStreetMap

References

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