STRUCTURE Construction on the Citicorp building started in

STRUCTURE Construction on the Citicorp building started in 1974 and was finished in 1977. It is located in New York City, New York. The purpose of this building is an office building. It is 915 feet tall. The columns were 114 feet high. The architectural style of it is postmodern. It is one of the first major Post Modern buildings in New York. The main architect was Hugh Stubbins. It cost 195 million dollars to build it. 50 million was spent on the terrain. The materials were steel, aluminum, and reflective glass. They were used because steel was strong, aluminum was light, and reflective glass was shiny and made it look good.

ARCHITECT Photo here The architect of the Citicorp building is Hugh Stubbins. He was born on January 19, 1912. He lived in Birmingham, Alabama. He attended Georgia Institute of Technology and Harvard University. He also earned a Master’s degree. He built the Loeb Drama Center, the New Quad, Veteran's Stadium, and many other buildings. He was on the faculty at Harvard until 1972. He also formed Hugh Stubbins and Associates. He died on July 5, 2006. http: //1. bp. blogspot. com/_brqu. JTtr_s. Y/TI 4 w. Br 56 j. JI/AAA AAAAAAp. A/DGw. D 0 t. Xh 9_o/s 1600/Stubbins. jpg

Interesting Facts 1) There was a flaw with the bolted joints. They were supposed to be welded together. The flaw was that the bolted joints were too weak to withstand 70 mph winds. They fixed the problem by welding one piece of metal onto the two bolted pieces. 2) That incident was hidden from the public for almost 20 years. 3) The Citicorp building was built on 4 columns positioned at the center of each side, so a new church could be built on the corner. 4) Citicorp was the first building in the US to have a tuned mass damper. 5) Hurricane Ella was heading for New York when the joints were still being fixed, but then it changed course. 6) Citicorp has 59 floors in all.

CHALLENGES One of the challenges of constructing the Citicorp Center was that St. Peter's Evangelical Lutheran Church was occupying the northwest corner of the building site. The church allowed Citicorp to demolish the old church on one condition. They had to have a new church built on the same corner with no connection to the Citicorp building and they could not have any columns passing through it. To solve this problem, Citicorp built it on four huge columns, but instead of putting them on all four corners, they put them on the center of each side.

SAFETY FEATURES In the Citicorp Building, Citicorp used a tuned mass damper to keep people safe. It is a 400 -ton block that they used it so it would counteract the swaying motions on the building from wind. It worked well. In 2002 Citicorp also installed blastresistant shields of copper as well as steel bracing to protect the building because there was a possibility of a terrorist attack.

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