OFFICE BUILDING WINDOWS INSIDE WORLD TRADE CENTER KEYGEN

OFFICE BUILDING WINDOWS INSIDE WORLD TRADE CENTER KEYGEN

Establishing the baseline performance of the towers began with the compilation and analysis of the procedures and practices used in the design, construction, operation, and maintenance of the structural, fire protection, and egress systems of the WTC towers. The baseline performance analysis also helped to estimate the ability of the towers to withstand the unexpected events of September 11, 2001. Establishment of the baseline performance of the WTC towers, i.e., estimating the expected performance of the towers under normal design loads and conditions.This guided the Investigation Team’s efforts to determine the condition of the buildings following the aircraft impact, the evolution of the fires, and the subsequent deterioration of the structure. With the assistance of the media, public agencies and individual photographers, NIST acquired and organized nearly 7,000 segments of video footage, totaling in excess of 150 hours and nearly 7,000 photographs representing at least 185 photographers. Accumulation of copious photographic and video material.

The scarcity of physical evidence that is typically available in place for reconstruction of a disaster led to the following approach: NIST and its contractors compiled and reviewed tens of thousand of pages of documents conducted interviews with over a thousand people who had been on the scene or who had been involved with the design, construction, and maintenance of the WTC analyzed 236 pieces of steel that were obtained from the wreckage performed laboratory tests that measured material properties, and performed computer simulations of the sequence of events that happened from the instant of aircraft impact to the initiation of collapse for each tower.Ĭooperation in obtaining the resource materials and in interpreting the results came from a large number of individuals and organizations, including The Port Authority of New York and New Jersey and its contractors and consultants, Silverstein Properties and its contractors and consultants, the City of New York and its departments, the manufacturers and fabricators of the building components, the companies that insured the WTC towers, the building tenants, the aircraft manufacturers, the airlines, and the media. In all, over 200 staff contributed to the investigation. To meet these goals, NIST complemented its in-house expertise with an array of specialists in key technical areas. Identify, as specifically as possible, areas in current building and fire codes, standards, and practices that warrant revision.Determine what procedures and practices were used in the design, construction, operation, and maintenance of WTC 1, 2, and 7.Determine why the injuries and fatalities were so high or low depending on location, including all technical aspects of fire protection, occupant behavior, evacuation, and emergency response and.Determine why and how WTC 1 and WTC 2 collapsed following the initial impacts of the aircraft and why and how WTC 7 collapsed.Recommended revisions to current codes, standards, and practices and.Improved tools and guidance for industry and safety officials.Improvements in the way buildings are designed, constructed, maintained, and used.To investigate the building construction, the materials used, and the technical conditions that contributed to the outcome of the WTC disaster after terrorists flew large jet-fuel laden commercial airliners into the WTC towers.The goals of the investigation of the WTC disaster were: 1 This WTC Investigation was then conducted under the authority of the National Construction Safety Team (NCST) Act, which was signed into law on October 1, 2002. NIST announced its building and fire safety investigation of the World Trade Center (WTC) disaster on August 21, 2002. I am pleased to appear today and testify on the building and fire safety investigation of the World Trade Center disaster carried out by the National Institute of Standards and Technology (NIST).

Chairman, and members of the Committee, I am William Jeffrey, Director of the National Institute of Standards and Technology.

Office building windows inside world trade center