Final Reports of the Federal Building and Fire
Investigation of the World Trade Center Disaster
NIST NCSTAR 1-1: Design,
Construction, and Maintenance of Structural and Life Safety Systems
The collapse of World Trade Center (WTC) 1, 2, and 7 resulted from
structural damage from direct and indirect effects of aircraft impact and
the ensuing fires. Thus, for collapse analyses of these buildings, knowledge
of the physical state of the structural and fire safety systems prior to the
aircraft impact is essential. To obtain information for the collapse
analysis of the buildings, National Institute of Standards and Technology
reviewed design and construction documents, correspondence, and memoranda
related to the building projects; interviewed individuals involved in the
design, construction, and maintenance of the buildings; obtained information
from regulatory and emergency services agencies of New York City; and
reviewed books and published journal and magazine articles related to the
WTC building projects.
Information obtained from various sources are synthesized and summarized
in this report. Specifically, this report presents (1) provisions used to
design and construct the structural, fire protection and egress systems of
the buildings; (2) tests performed to support the design of these systems;
(3) criteria that governed the design of the structural and fire protection
systems; (4) methods used to proportion structural members and other
components of the buildings; (5) innovative features, technologies and
materials that are incorporated in design and construction of the structural
and fire protection systems; (6) details of deviations to the contract
documents granted by Port Authority of New York and New Jersey; (7)
fabrication and inspection requirements at the fabrication yard; and (8)
inspection protocols during construction.
This report also documents the fuel system for the diesel generators that
supplied emergency power to many of the tenants in WTC 7. Findings
from the synthesis of the information collected and resulting issues are
presented.
- NIST NCSTAR 1-1: Design,
Construction, and Maintenance of Structural and Life Safety Systems
- NIST NCSTAR 1-1A: Design
and Construction of Structural Systems
- NIST NCSTAR 1-1B: Comparison
of Building Code Structural Requirements
- NIST NCSTAR 1-1C: Maintenance
and Modifications to Structural Systems
- NIST NCSTAR 1-1D: Fire
Protection and Life Safety Provisions Applied to the Design and
Construction of World Trade Center 1, 2, and 7 and Post-Construction
Provisions Applied after Occupancy
- NIST NCSTAR 1-1E: Comparison
of Codes, Standards, and Practices in Use at the Time of the Design
and Construction of World Trade Center 1, 2, and 7
- NIST NCSTAR 1-1F: Comparison
of the 1968 and Current (2003) New York City Building Code Provisions
- NIST NCSTAR 1-1G: Amendments
to the Fire Protection and Life Safety Provisions of the New York
City Building Code by Local Laws Adopted while World Trade Center
1, 2, and 7 Were in Use
- NIST NCSTAR 1-1H: Post-Construction
Modification to Fire Protection and Life Safety Systems of the
World Trade Center Towers
- NIST NCSTAR 1-1I: Post-Construction
Modifications to Fire Protection, Life Safety, and Structural
Systems of World Trade Center 7
- NIST NCSTAR 1-1J: Design, Installation, and Operation of Fuel
Systems for Emergency Power in World Trade Center 7
The reports provided here are presented in .pdf format. To read these files, you can download
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latest version of Adobe Acrobat Reader free. If you have difficulty
reading pdf files, you may need to update
your version of Acrobat reader to the latest version. These 14 pdf
files for Project 1-1 may also be downloaded as a group within a
WINZIP (.zip) file. (Note: this
file is very large - 115 MB)
