Study on the Fire Behavior of Concrete Structures
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analysis of multi-story concrete frames under fire with fiber beam model,
Journal of Building Structures, 2009, 30(6): 44-53.
Abstract: In order to analyze and
simulate the response and collapse of multi-story reinforced concrete
frames 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, this model can consider the
non-uniform temperature distribution across the section and simulate
the behavior of material nonlinearity and geometry nonlinearity. Then,
the fiber model proposed in this paper is validated by comparing with
experimental results from a one-story, one-bay frame fire test. Finally,
the response and collapse process of a multi-story reinforced concrete
structure is analyzed and the influence of different fire scenarios
is discussed.
Key words: fire response, fiber model, beam element, collapse,
multi-story structures
Fiber
beam element model for the collapse simulation of concrete structures
under fire
Chinese Journal of Computational Mechanics, 2009, 26(1):
72-79.
Abstract: In order to analyze and
simulate the collapse of reinforced concrete 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 Lagrange description,
and the incremental equilibrium equations are also established. Finally,
the fiber model proposed in this paper is validated by comparing with
various experimental results.
Key words: fiber model, beam element, fire, nonlinearity
Simulation
for concrete structures under various disasters: model development and
engineering application
Proc. 2nd Int. Forum on Advances in Structural Engineering,
Oct. 2008, Dalian: 653-660.
Abstract: Engineering structures
could be destroyed by disaster loads, such as earthquake, fire, blast
et al. In concrete structures, frames, shear walls and slabs are major
structural elements, and therefore accurate simulation for the nonlinear
behavior of them in various disasters is the key problem for the researches
on disaster resistance of concrete structures. The Department of Civil
Engineering in Tsinghua University developed fiber beam model and multi-layer
shell model for the ultimate analysis of structures. These models could
accurately simulate the nonlinear failure process of concrete structures
in earthquake, fire, blast, progressive collapse et al. And with the
high efficiency of these models, they can be used in the whole process
simulation of real large-scale complicated RC structures under various
disasters. This paper presents the principles of the models and their
typical applications in researches and practices.
Keywords: disaster simulation; fiber model; multi-layer shell
model; dynamic large deformation computation; thermal-mechanical coupled
computation
Numerical
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