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Building the World Trade Center

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Jeannette Latoria
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« Reply #30 on: December 25, 2009, 01:13:23 am »

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Jeannette Latoria
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« Reply #31 on: December 25, 2009, 01:13:48 am »

Modifications

Over time, numerous structural modifications were made to suit the needs of tenants in the Twin Towers. Modifications were made in accordance with the Port Authority's Tenant Alteration Review Manual and were reviewed by the Port Authority to ensure the changes did not compromise structural integrity of the buildings. In many instances, openings were cut in the floors to accommodate new stairways to connect tenant floors. Some steel beams in the core were reinforced and strengthened to accommodate heavy live loads, such as large amounts of heavy files that tenants had on their floors.

Repairs to structural elements on the lower levels of 1 WTC [North Tower] were made following the 1993 World Trade Center bombing. The greatest damage occurred on levels B1 and B2, with significant structural damage also on level B3. Primary structural columns were not damaged, but secondary steel members experienced some damage. Floors that were blown out needed to be repaired to restore the structural support they provided to columns. The slurry wall was in peril following the bombing and loss of the floor slabs which provided lateral support to counteract pressure from Hudson River water on the other side. The refrigeration plant on sublevel B5, which provided air conditioning to the entire World Trade Center complex, was heavily damaged and replaced with a temporary system for the summer of 1993. The fire alarm system for both towers needed to be replaced, after critical wiring and signaling in the original system was destroyed in the 1993 bombing. Installation of the new system took years to complete, and replacement of some components was still underway at the time of the September 11, 2001 attacks.
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Jeannette Latoria
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« Reply #32 on: December 25, 2009, 02:26:20 am »

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« Reply #33 on: December 25, 2009, 02:29:46 am »

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« Reply #34 on: December 25, 2009, 02:31:17 am »

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Jeannette Latoria
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« Reply #35 on: December 25, 2009, 02:32:31 am »

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Michelle Jahn
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« Reply #36 on: December 28, 2009, 05:36:14 am »



Photo, World Trade Center construction, train tubes and foundations.  · World Trade Center - More Images · New York, New York
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Michelle Jahn
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« Reply #37 on: December 28, 2009, 05:37:17 am »



Photo, World Trade Center construction, tower base and cranes.  · World Trade Center - More Images · New York, New York
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Michelle Jahn
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« Reply #38 on: December 28, 2009, 05:38:18 am »



Photo, World Trade Center construction, tower base with facade structure.  · World Trade Center - More Images · New York, New York
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Michelle Jahn
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« Reply #39 on: December 28, 2009, 05:39:15 am »



Photo, World Trade Center construction, towers rising.  · World Trade Center - More Images · New York, New York
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Michelle Jahn
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« Reply #40 on: December 28, 2009, 05:40:41 am »



Photo, World Trade Center construction, core and structural perimeter of tower.  · World Trade Center - More Images · New York, New York
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Michelle Jahn
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« Reply #41 on: December 28, 2009, 05:41:24 am »



Photo, World Trade Center construction, rising towers at dusk.  · World Trade Center - More Images · New York, New York
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Michelle Jahn
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« Reply #42 on: December 28, 2009, 05:42:18 am »



Photo, skyline from Brooklyn with World Trade Center towers.  · World Trade Center - More Images · New York, New York
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