★ The Twin Towers ★

◆ Andy Echeverria ◆

The Twin Tours

The Twin Towers

Location - New York City.

Height - 110 stories tall .

Date completed - December 23

Engineer or architect - Port Authority

materials - External Walls , Interior Floors Tubes .

Destroyed - September 11

Engineering challenges and solution

It had to be hold from wind or other weather .

Burj khalifa

Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010

Engineer or architect

Adrain Smith was the builder of the Burj Khalifa

primary building materials

Burj Khalifa required 330,000 cubic meters of concrete .

31,400 metric tons of steel rebar were used to reinforce the concrete.

other major materials used are glass, silicone, and aluminum .

Petronas Tower

Petronas Tower

The towers were designed by Argentine American architect Cesar Peli . postmodern style to create a 21st-century icon for Kuala Lumpur. Planning on the Petronas Towers started on 1 January 1992 simulations of wind and structural loads on the design. Seven years of construction followed, beginning on 1 March 1993, which involved moving 500 truckloads of earth every night to dig down 30 metres (98 ft) below the surface .

Empire State Building

The site of the Empire State Building was first developed as the John Thompson Farm in the late 18th century. At the time, a stream ran across the site, located a block away. Beginning in the late 19th century, the block was occupied by the Waldorf-Astoria Hotel, frequented by The Four Hundred, the social elite of New York.

Engineer or Architect

Main contractor -Starrett Brothers and Eken

Sony Tower

The Sony Tower, formerly the AT&T Building, is a 647 feet tall, 37-story highrise skyscraper located at 550 Madison Avenue between 55th Street and 56th Street in the New York City borough of Manhattan.

Height

647' (197 m) tall

Architect

John Burgee & Philip Cortelyou Johnson

The Chrysler Building

The Chrysler Building is an Art Deco style skyscraper in New York City, located on the east side of Manhattan in the Turtle Bay area at the intersection of 42nd Street and Lexington Avenue.

Height

1,046' (319 m)

Architects

William Van Alen, Walter Chrysler

Sears Tower

Sears Tower is a 108-story, 1,451-foot skyscraper in Chicago, Illinois. At the time of its completion in 1973, it was the tallest building in the world, in New York .

Height

1,451' (442 m)

Architect :Bruce Graham

Owners: Joseph Chetrit

Singer Building

The Singer Building or Singer Tower at Liberty Street and Broadway in Manhattan, was a 47-story office building completed in 1908 as the headquarters of the Singer Manufacturing Company. It was the tallest building in the world from 1908-1909.

Height

612' (187 m)

Architect

Ernest Flagg

Demolished

1968