Study on the Fire induced Structural Collapse

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Progressive collapse analysis of a typical super-tall reinforced concrete frame-core tube building exposed to extreme fires Fire Technology, 2016 Download
A case study on a fire-induced collapse accident of a reinforced concrete frame-supported masonry structure Fire Technology, 2015 Download
Numerical models of fire induced progressive collapse analysis for reinforced concrete frame structures Engineering Mechanics, 2012 Download
Effect of spalling on the progressive collapse resistance of reinforced concrete frame structures Journal of Railwal Science and Engineering, 2010 Download
Nonlinear analysis of multi-story concrete frames under fire with fiber beam model, Journal of Building Structures, 2009 Download
Numerical analysis and simulation of space concrete frames under fire Journal of Natural Disasters, 2007 Download
Fiber beam element model for the collapse simulation of concrete structures under fire Proc. Int. Symp. on Computational Mechanics (ISCM2007) Download

Numerical models of fire induced progressive collapse analysis for reinforced concrete frame structures,
Engineering Mechanics, 2012, 29(4): 96-103.

Abstract: Progressive collapse is the global behavior of the whole structural system. In order to investigate the fire induced progressive collapse of reinforced concrete (RC) frame structures, a fiber beam model for RC beam and column and a multilayer shell model for RC slab are established. For elemental-scale, the sections at integration points are divided into some fibers or layers. Different material properties are assigned to various fibers or layers to consider the contributions of steel reinforcement and concrete. The relationship between the deformations of the elements and the strains of the fibers or layers is defined according to the assumption that section remains plane. For material-scale, temperature-stress coupled loading path is discretized into sub-increments. The various strains of fibers or layers, induced by coupled action of temperature and stresses, are calculated within each sub-increment. The accuracy and efficiency of the models in simulating the RC beams, columns and slabs in fire are validated through a series of fire tests. In order to simulate the discontinuous displacement field during the procedure of structure collapse, the failure criterion and the deactivation of the structural elements are introduced to the model. Therefore, the influence of internal force redistribution induced by element failure on the mechanical response of whole structure is taken into consideration. At last, a frame structure is analyzed to study the failure mechanism of its fire induced collapse via the proposed numerical models.
Keywords: concrete frame structure, fire induced collapse, numerical model, fiber beam, multi-layer shell, failure

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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

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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

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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

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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

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