Concrete pavements subjected to hail showers: A semi-analytical thermoelastic multiscale analysis

Hui, Wang; Höller, Raphael; Aminbaghai, Mehdi; Hellmich, Christian; Yuan, Yong; Mang, Herbert A.; Pichler, Bernhard

doi:10.1016/j.engstruct.2019.109677

Cited by 15 publications

(23 citation statements)

References 55 publications

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“…Thus, the eigencurvature results in thermal stresses of the plate. These stresses, however, turn out to be negligible relative to the thermal stresses resulting from the nonlinear part of the eigenstrains [4]. This nonlinear part of the eigenstrains can be interpreted as an eigendistortion of the generators of the plates.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 97%

“…The homogenized thermomechanical properties of concrete [22] are used as input for the structural analysis of a pavement plate subjected to solar heating, followed by a suddenly starting hail shower [4]. The thickness of the plate amounts to 25 cm, the homogenized Young's modulus of concrete to 32 GPa, and the homogenized coefficient of thermal expansion to 11.5 × 10 −6 / • C. At first, heat conduction in the thickness direction is analyzed.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 99%

“…The described thermal loading results in transient heat conduction. This problem can be solved based on existing series solutions [4], providing quantitative access to the time-dependent and spatially nonlinear distributions of the temperature. The resulting thermal eigenstrains of concrete are equal to the product of the temperature changes and the homogenized thermal expansion coefficient.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 99%

“…The thermal stresses of the pavement plate are quantified using the theory of thin plates [4]. It is based on Kirchhoff's normal hypothesis.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 99%

“…the internal relative humidity [2]. At the macrostructural scale, thermal eigenstrains, resulting from transient heat conduction, were analyzed [3,4]. Herein, the question is discussed whether or not it is possible to define equivalent temperature gradients, such that a structural analysis can be carried out with commercial simulation software, such as recommended by the state-of-the-art guideline [5].…”

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confidence: 99%

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Application-oriented fundamental research on concrete and reinforced concrete structures: selected findings from an Austro-Chinese research project

et al. 2020

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In this paper, the significance of application-oriented fundamental research on concrete and reinforced concrete structures for progress regarding practical applications to structural design is addressed based on four examples. They were treated in a joint research project of Vienna University of Technology and Tongji University. The first topic refers to sudden heating or cooling of concrete structures, the second one to highdynamic strength of specimens made of cementitious materials, the third one to structural analysis of segmental tunnel rings used in mechanized tunneling, and the fourth one to serviceability and ultimate limit states of concrete hinges used in integral bridge construction. The first two topics deal with exceptional load cases. Results from the fundamental research call for improvements of state-of-the-art simulation approaches used in civil engineering design. The last two topics refer to reinforced concrete hinges used in mechanized tunneling and integral bridge construction, respectively. Integrative research has led to progress regarding the verification of serviceability and ultimate limit states. In all four examples, results from fundamental research are used to scrutinize state-of-the-art approaches used in practical structural design of civil engineering structures. This allows for identifying interesting directions for the future development of design guidelines and standards.

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Section: Results From Recent Fundamental Researchmentioning

confidence: 97%

Section: Results From Recent Fundamental Researchmentioning

confidence: 99%

Section: Results From Recent Fundamental Researchmentioning

confidence: 99%

“…The thermal stresses of the pavement plate are quantified using the theory of thin plates [4]. It is based on Kirchhoff's normal hypothesis.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 99%

mentioning

confidence: 99%

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Application-oriented fundamental research on concrete and reinforced concrete structures: selected findings from an Austro-Chinese research project

et al. 2020

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A dehydration kinetic model of calcium silicate hydrates at high temperature

Wang

Chen

Yang

et al. 2022

Structural Concrete

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Dehydration of calcium silicate hydrates, the primary binding phase of cement paste, contributes significantly to the degradation of cementitious materials at high temperatures. Kinetics of the dehydration process is usually parameterized as the product of the classic Arrhenius equation and a kinetic expression, calibrating the influence of the temperature and the reaction degree, respectively. By means of the Exp-function approximation, an improved kinetic expression is proposed and the differential equation is solved by utilizing the Mean-value Theorem for integrals. The established dehydration model is validated by comparing with independent experimental measurements, concerning different heating regime and molar ratios of calcium-to-silicon. Both the temperature history and the calcium-to-silicon molar ratios influence the kinetics and the final status of the dehydration process. The established model provides access to further investigation of the microstructural evolution of heated concrete, containing supplementary cementitious materials.

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On the added value of multi-scale modeling of concrete

Zhang

Binder

Wang

et al. 2022

Front. Struct. Civ. Eng.

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This review of the added value of multi-scale modeling of concrete is based on three representative examples. The first one is concerned with the analysis of experimental data, taken from four high-dynamic tests. The structural nature of the high-dynamic strength increase can be explained by using a multi-scale model. It accounts for the microstructure of the specimens. The second example refers to multi-scale thermoelastic analysis of concrete pavements, subjected to solar heating. A sensitivity analysis with respect to the internal relative humidity (RH) of concrete has underlined the great importance of the RH for an assessment of the risk of microcracking of concrete. The third example deals with multi-scale structural analysis of a real-scale test of a segmental tunnel ring. It has turned out that multi-scale modeling of concrete enables more reliable predictions of crack opening displacements in tunnel segments than macroscopic models taken from codes of practice. Overall, it is concluded that multi-scale models have indeed a significant added value. However, its degree varies with these examples. In any case, it can be assessed by means of a comparison of the results from three sources, namely, multi-scale structural analysis, conventional structural analysis, and experiments.

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Concrete pavements subjected to hail showers: A semi-analytical thermoelastic multiscale analysis

Cited by 15 publications

References 55 publications

Application-oriented fundamental research on concrete and reinforced concrete structures: selected findings from an Austro-Chinese research project

Application-oriented fundamental research on concrete and reinforced concrete structures: selected findings from an Austro-Chinese research project

A dehydration kinetic model of calcium silicate hydrates at high temperature

On the added value of multi-scale modeling of concrete

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