Study on the Fire Behavior of Concrete Frames
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DownloadNumerical
modeling of reinforced concrete slabs subjected to fire
Engineering Mechanics, 2008, 25(3): 107-112.
Abstract: Based on the degenerated
shell theory, a finite element numerical model is proposed to analyze
the behavior of the reinforced concrete slabs exposed to fire. The non-uniform
temperature distribution across the section of the slab is considered.
The temperature dependent thermal-elastic plastic material model is
introduced in each layer through the layered model. The geometric nonlinearity
due to large displacement is taken into consideration through Total
Lagrange approach. The proposed model is validated by a fire experimental
test on a reinforced concrete slab and the effects of parameters including
the ratio of reinforcement and the thickness of the concrete cover are
analyzed. The results show that the predictions agree well with the
experimental results and the proposed model can be used to analyze the
response of the reinforced concrete slabs under fire.
Key words: reinforced concrete slab; fire response; layered model;
membrane action; nonlinear analysis
Numerical
analysis and simulation of space concrete frames under fire
Journal of Natural Disasters, 2007, 6(6):88-92.
Abstract: Based on the fiber element
model and layered shell element model developed and validated by the
authors, this paper establishes the numerical model for space concrete
frames under fire. The connection relationship between the both elementmodels
is also considered and the overall analysis p rocess of space concrete
frames under fire is accomp lished by a system (RCFire) developed for
analyzing the overall behavior of structures under fire. To consider
the non2uniform temperature distribution and material nonlinearity,
the across2sections of the both elements are subdivided into many small
fibers or layers. Finally, a concrete frame structure under fire is
analyzed and the response regularity is investigated. The results can
be used as the reference for the fire safety design of building structures
under fire.
Keywords: fire response; space concrete frame; elementmodel;
numerical simulation
Fiber
beam element model for the collapse simulation of concrete structures
under fire,
Proc. International Symposium on Computational Mechanics
(ISCM2007), Yao ZH & Yuan MW (eds.), Beijing: Tsinghua University
Press & Springer, July 30-August 1, 2007, Beijing, China, 288 &
CDROM.
Abstract: In order to analyze and
simulate the collapse of reinforced concrete (RC) elements under fire,
a novel numerical model based on the fiber beam model is proposed in
this paper. By dividing the cross section of beam element into many
small concrete and steel fibers and assigning different materials to
each fiber, this model can consider the non-uniform temperature distribution
across the section and simulate the behavior of cracking or crushing
for concrete and yielding for steel. The explicit tangential stiffness
matrix is deduced for proposed fiber beam with Total Lagrangian (TL)
description, and the incremental equilibrium equations are also established.
Finally, the proposed fiber model is validated by comparing with various
experimental results.
Key words: fiber model, beam element, fire, collapse, nonlinearity