Numerical simulation of the load-carrying behavior of RC tunnel structures exposed to fire

Feist, Christian; Aschaber, Matthias; Hofstetter, Günter

doi:10.1016/j.finel.2009.09.010

Cited by 31 publications

(12 citation statements)

References 11 publications

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“…elevation [53,49], on the thermophysical properties of concrete. In recent years, various researchers have implemented experimental tests and numerical simulations [54,40,[55][56][57][58][59][60][61][62][63][64][65][66] to probe the relationships between the temperature-induced stress field and the explosive spalling of both HSC (high-strength concrete) and HPC (high-performance concrete) during heating processes. Fumie [67] carried out experiments and mathematical calculations and captured the concrete crack sound before spalling.…”

Section: Introductionmentioning

confidence: 99%

On the thermal spalling mechanism of reactive powder concrete exposed to high temperature: Numerical and experimental studies

Liu

et al. 2016

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

On the thermal spalling mechanism of reactive powder concrete exposed to high temperature: Numerical and experimental studies

Liu

et al. 2016

International Journal of Heat and Mass Transfer

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“…Obviously, the uneven temperature and stress fields after heating are considered as the causes for the spalling of concrete, although these mechanisms offer different explanations on the internal driving forces for explosive spalling. In recent years, some researchers have adopted experimental tests and numerical simulations [17,18,21,29,31,35,[56][57][58][59][60][61][62][63][64] to probe the relationships between the temperature-stress field and explosive spalling of HSC and HPC during the heating process. The calculation model considering the coupled thermal-mechanical effect in the process of concrete hydration was proposed.…”

Section: Introductionmentioning

confidence: 99%

Investigation on thermophysical properties of reactive powder concrete

Liu

et al. 2011

Sci. China Technol. Sci.

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The thermophysical properties, such as thermal conductivity, thermal diffusivity, specific heat capacity and linear thermal expansion of reactive powder concrete (RPC) with different steel fiber volumetric fractions are investigated by means of high temperature tests. The thermophysical characteristics of RPC with different fiber volumes under different temperatures are analyzed and compared with those of the common high-strength concrete and high-performance concrete. The empirical relationships of thermophysical properties with temperature and fiber volume are identified. By the heat transfer and solid physics methods, the microscopic physical mechanism of heat transfer process and heat conduction properties of RPC are investigated, and the theoretical formulas of specific heat capacity and thermal expansion coefficient are derived, respectively. The effects of temperature and steel fibers on the specific heat capacity and the thermal expansion coefficient are quantitatively analyzed and the discriminant conditions are provided. It is shown that the experimental results are consistent with the theoretical prediction. reactive powder concrete (RPC), thermophysical properties, high temperature, fiber reinforcement, heat conduction, specific heat capacity, thermal expansion coefficient Citation: Ju Y, Liu H B, Liu J H, et al. Investigation on thermophysical properties of reactive powder concrete.

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“…where S ir is the irreducible saturation degree of the liquid phase, below which there is no flow of the liquid phase (sometimes assumed as S ir = 0), S cr is the critical saturation degree of the pore liquid phase, above which there is no flow of the gas mixture phase (sometimes assumed as S cr = 1), and A w and A g are the constants with the values in the range [1,3] [10,33] .…”

Section: Flow Modelmentioning

confidence: 99%

“…indicate that fires in tunnels not only endanger lives of tunnel users, but also cause damage of lining structures, loss of loadcarrying capacity and stability, and even cave-in collapse of tunnel vaults [1][2][3] . It is commonly known that all the above serious hazards relate to the performance of concrete structures at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Coupled thermo-hygro-mechanical damage model for concrete subjected to high temperatures

Liu

2012

Appl. Math. Mech.-Engl. Ed.

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Based on the theory of mixtures, a coupled thermo-hygro-mechanical (THM) damage model for concrete subjected to high temperatures is presented in this paper. Concrete is considered as a mixture composed of solid skeletons, liquid water, water vapor, dry air, and dissolved air. The macroscopic balance equations of the model consist of the mass conservation equations of each component and the momentum and energy conservation equations of the whole medium mixture. The state equations and the constitutive model used in the model are given. Four final governing equations are given in terms of four primary variables, i.e., the displacement components of soil skeletons, the gas pressure, the capillary pressure, and the temperature. The processes involved in the coupled model include evaporation, dehydration, heat and mass transfer, etc. Through the process of deformation failure and the energy properties, the mechanics damage evolution equations are established based on the principle of conversation of energy and the Lemaitre equivalent strain assumption. Then, the influence of thermal damage on the mechanical property is considered.

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Numerical simulation of the load-carrying behavior of RC tunnel structures exposed to fire

Cited by 31 publications

References 11 publications

On the thermal spalling mechanism of reactive powder concrete exposed to high temperature: Numerical and experimental studies

On the thermal spalling mechanism of reactive powder concrete exposed to high temperature: Numerical and experimental studies

Investigation on thermophysical properties of reactive powder concrete

Coupled thermo-hygro-mechanical damage model for concrete subjected to high temperatures

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