Multi-Physics Analyses of Selected Civil Engineering Concrete Structures

Kruis, Jaroslav; Koudelka, Tomáš; Krejcˇí, T.

doi:10.4208/cicp.031110.080711s

Cited by 25 publications

(5 citation statements)

References 19 publications

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“…The thermal and the mechanical behaviors are coupled in a weak sense. For the thermo-mechanical coupling problem, there are two primary unknowns, namely, the mechanical displacement u and the temperature Θ, thus the generalized weak form of the balance equation is defined as (Hain, 2007; Kruis et al , 2012): …”

Section: Numerical Simulation Of the Damage Process Of Concrete Based On Thermo-mechanical Coupling Methodsmentioning

confidence: 99%

Multi-scale numerical simulation analysis for influence of combined leaching and frost deteriorations on mechanical properties of concrete

Hu¹

2016

MMMS

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Purpose The multi-scale numerical simulation method, able to represent the complexity of the random structures and capture phase degradation, is an effective way to investigate the long-term behavior of concrete in service and bridges the gap between research on the material and on the structural level. However, the combined chemical-physical deterioration mechanisms of concrete remain a challenging task. The purpose of this paper is to investigate the degradation mechanism of concrete at the waterline in cold regions induced by combined calcium leaching and frost damage. Design/methodology/approach With the help of the NIST’s three-dimensional (3D) hydration model and the random aggregate model, realistic 3D representative volume elements (RVEs) of concrete at the micro-, the meso-, and the macro-scales can be reconstructed. The boundary problem method is introduced to compute the homogenized mechanical properties for both sound and damaged RVEs. According to the damage characteristics, the staggering method including a random dissolution model and a thermo-mechanical coupling model is developed to simulate the synergy deterioration effects of interacted calcium leaching and frost attacks. The coupled damage procedure for the frost damage process is based on the hydraulic pressure theory and the ice lens growth theory considering the relationship between the frozen temperature and the radius of the capillary pore. Finally, regarding calcium leaching as the leading role in actual engineering, the numerical methodology for combined leaching and frost damage on concrete property is proposed using a successive multi-scale method. Findings On the basis of available experimental data, this methodology is employed to explore the deterioration process. The results agree with the experimental ones to some extent, chemical leaching leads to the nucleation of some micro-cracks (i.e. damage), and consequently, to the decrease of the frost resistance. Originality/value It is demonstrated that the multi-scale numerical methodology can capture potential aging and deterioration evolution processes, and can give an insight into the macroscopic property degradation of concrete under long-term aggressive conditions.

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Section: Numerical Simulation Of the Damage Process Of Concrete Based On Thermo-mechanical Coupling Methodsmentioning

confidence: 99%

Multi-scale numerical simulation analysis for influence of combined leaching and frost deteriorations on mechanical properties of concrete

Hu¹

2016

MMMS

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“…e.g. [28]. Remark 3.5 (A general treatment of swelling or thermal expansion) Some models would rather need, instead of (1.1), a more general form…”

Section: Example 33 (Magnetic and Hydride Transformations In Intermementioning

confidence: 99%

Thermomechanics of damageable materials under diffusion: modelling and analysis

Roubíček

Tomassetti

2015

Z. Angew. Math. Phys.

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We propose a thermodynamically consistent general-purpose model describing diffusion of a solute or a fluid in a solid undergoing possible phase transformations and damage, beside possible visco-inelastic processes. Also heat generation/consumption/transfer is considered. Damage is modelled as rate-independent. The applications include metalhydrogen systems with metal/hydride phase transformation, poroelastic rocks, structural and ferro/para-magnetic phase transformation, water and heat transport in concrete, and, if diffusion is neglected, plasticity with damage and viscoelasticity, etc. For the ensuing system of partial differential equations and inclusions, we prove existence of solutions by a carefully devised semi-implicit approximation scheme of the fractional-step type.

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“…Similar situation occurs in coupling of mechanics with heat transfer. The one way coupling is acceptable in the case of elastic, visco-elastic, plastic and visco-plastic behavior [1]. In these cases, material is assumed to be continuous without voids or cracks.…”

Section: Introductionmentioning

confidence: 99%