Study on the Fire induced Structural Collapse
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DownloadSimulation
for fire-induced progressive collapse of an 8-storey RC frame structure,
Proc. 19th National Conference on Structural Engineering,
Nov. 2010, Jinan, China: 67-74.
Abstract: High efficient numerical
models that can simulate the behaviors of entire structural system are
very important to the study on fire-induced progressive collapse of
RC frame structures. A fire-induced collapse simulation program is developed
which is based on the fiber beam model and the multi-layer shell model.
The constitutive models of materials at high temperature that are adopted
in the program are discussed. And the accuracy of the program in simulating
RC members in fire is verified by test results. At last, the progressive
collapse of an 8-storey frame in fire is simulated and the mechanism
of collapse is discussed.
Keywords: RC frame structure, fire-induced progressive collapse,
numerical simulation, fiber beam model, multi-layer shell model
Effect
of spalling on the progressive collapse resistance of reinforced concrete
frame structures,
Journal of Railwal Science and Engineering, 2010, 7(sup.):
154-157.
Abstract: In order to understand
the effect of spalling on the progressive collapse resistance of reinforced
concrete frame structures, an existing simplified spalling model is
employed in the numerical model for collapse analysis of whole structures
in fire. And then the collapse process of an 8-storey frame structure
is simulated. The result indicates that the influence of spalling is
unremarkable on collapse resistance of the whole structure when fire
area is small. Base on the conclusion, some advices for the simulation
of whole structure in fire are proposed.
Keywords: concrete frame structure, spalling, fire-induced collapse
Nonlinear
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
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