The Manhattan West North-East tower is a high rise office building located in Midtown Manhattan, New York City, one of densest and busiest business hubs in North America, and part of a larger parcel of land encompassing extensive areas of active railroad tracks. The rapid growth in this area necessitated the development of engineering designs and construction methods that could enable building over tracks and exploiting air space. In this particular case, a creative engineering solution has been implemented in order to kick the majority of the perimeter columns back to the concrete core, and therefore avoid the existing train traffic running below. This paper will delve into the challenges and specifics of this innovative structural system and all the related design optimizations. The 35 Hudson Yards is a 71 story mixed-use building located over the railroad yard below at the southeast corner of 33rd Street and 11th Avenue in Midtown Manhattan, New York City. The building height is approximately 1010 feet above the Platform level and an additional 35 feet above the railroad tracks. 35 Hudson Yards as a point tower incorporates 1.05 million square feet of mixed-use program consisting of retail, health club, office, hotel, and residential. Above the railroad tracks at roughly the elevation of the surrounding streets, a structural steel Platform will be constructed to cover the tracks and to support the Tower above. The Platform supporting columns and walls have been located between the railroad tracks using specified clearances required by Amtrak and MTA guidelines. Typical spacing of vertical supports to which the tower core wall and perimeter columns are aligned and transferred is approximately 50 feet in the north-south direction. Caissons supporting the vertical platform columns and walls will be drilled into bedrock throughout much of the site. The tower above consists of a reinforced concrete core wall system supplemented by buttress walls from the core out to the perimeter. Four (4) reinforced concrete buttress walls in the north-south direction and two (2) reinforced concrete buttress walls in the east-west direction extended from the core wall system out to the perimeter of the building. In addition, concrete belt walls at three levels are utilized to resist lateral loads. The floor framing system for office, hotel and residential consists of reinforced concrete flat plate supported by perimeter reinforced concrete columns and core/buttress walls. The design of tall buildings over the railroad yard requires not only structural design challenge for the design team but also provides significant opportunity converting air rights to build tall buildings in New York City.
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