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Provides minimum structural integrity for framed and bearing
wall structures through continuity and tie-force requirements for buildings over 75 ft.
in height that represent a substantial hazard to human life in the event of failure (e.g.,
buildings with occupant loads exceeding 5,000) and essential facilities, such as
hospitals.) This code change is intended to enhance overall structural integrity but is
not intended to prevent progressive collapse in structures.
Increased by one hour the fire-resistance rating of structural
components and assemblies in buildings 420 feet and higher. This change was
approved and included in the 2004 supplement to the IBC and later in the 2006 IBC
(section 403.3.1, Item 1)
(National Electrical Code) Article 708 of the 2008 National Electrical Code
critical operations power supply. The article can be applied to any critical systems.
Increased bond strength for fireproofing (nearly three times
greater than currently required for buildings 75-420 feet in height and seven times
greater for buildings more than 420 feet in height). The increased fireproofing bond
strength is required to be "installed throughout the building."
Field installation requirements for fireproofing to ensure that:
installation complies with the manufacturer's instructions;
the substrates (surfaces being fireproofed) are clean and free of any condition
that prevents adhesion;
testing is conducted to demonstrate that required adhesion is maintained for
primed, painted or encapsulated steel surfaces; and
the finished condition of the installed fireproofing, upon complete drying or
curing, does not exhibit cracks, voids, spalls, delamination or any exposure of
Special field inspections of fireproofing to ensure that the as-installed thickness,
density and bond strength meet specified requirements, and that a bonding agent is
applied when the bond strength is less than required due to the effect of a primed,
painted or encapsulated steel surface. The inspections are to be performed after the
rough installation of mechanical, electrical, plumbing, sprinkler and ceiling systems.
(ASTM) ASTM E2584-07
"Standard Practice for Thermal
Conductivity of Materials Using a Thermal Capacitance (Slug) Calorimeter."
Explicit adoption of the "structural frame" approach to fire
resistance ratings that requires all members of the primary structural frame to have the
higher fire resistance rating commonly required for columns. The primary structural
frame includes the columns, other structural members including the girders, beams,
trusses, and spandrels having direct connections to the columns, and bracing members
designed to carry gravity loads. The definition of the primary structural frame was
broadened to include bracing members essential to vertical stability (e.g., floor systems
or cross bracing) whether or not they carry gravity loads.
(NFPA) The structural frame approach is mandated in the 2006 edition of NFPA 5000.
(NIST) Published “Best Practice Guidelines for Structural Fire
Resistance Design of Concrete and Steel Buildings,” (NIST TN 1681)
Requires greater reliability of sprinklers with a minimum of
two water supply risers for each sprinkler zone in buildings over 420 ft. in
height. Each riser is required to supply sprinklers on alternate floors. The sprinkler
risers are to be placed in stair enclosures which are remotely located.