Recent Advances in Fire-Structure Analysis.
Recent Advances in Fire-Structure Analysis.
(777 K)
Duthinh, D.; McGrattan, K. B.; Khaskia, A.
Technical Memorandum of PWRI 4075;
Wind and Seismic Effects. U.S./Japan Natural Resources
Development Program (UJNR). Joint Meeting, 39th.
Technical Memorandum of PWRI 4075. Proceedings. May
14-16, 2007, Tsukuba, Japan, 310-319 pp, 2007.
Keywords:
wind effects; seismic design; structures; surface
temperature; insulation; thermometers; structural
analysis; thermal analysis; ASTM E 119; fire tests;
equations; experiments; temperature transfer;
deflection; fire simulation; test methods; beams
Abstract:
One of the recommendations of the National Construction
Safety Team for the Federal Building and Fire Safety
Investigation of the World Trade Center Disaster (NIST
NCSTAR 1, 2005) is to enhance the capability of
available computational software to predict the effects
of fires in buildings, for use in the design of fire
protection systems and the analysis of building response
to fires. This paper presents two new interfaces in
fire-thermal-structural analysis. The first interface
uses adiabatic surface temperatures to provide an
efficient way of transferring thermal results from a
fire simulation to a thermal analysis. It assigns these
temperatures to surface elements of structural members
based on proximity and directionality. The second
interface allows the transfer of temperature results
from a thermal analysis modeled with solid elements to a
structural analysis modeled with beams and shells. The
interface also allows the reverse, namely the geometric
updating of the thermal model with deflections and
strains obtained from the structural analysis. This last
step is particularly useful in intense fires of long
duration, where significant deflections and strains
could cause damage to insulation and displace the
structure to a different thermal regime. The procedures
can be used for a variety of fire simulation, thermal
and structural analysis software.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899