Multiscale structural analysis inspired by exceptional load cases concerning the immersed tunnel of the Hong Kong-Zhuhai-Macao Bridge

Wang, Hui; Binder, Eva; Mang, Herbert A.; Yuan, Yong; Pichler, Bernhard

doi:10.1016/j.undsp.2018.02.001

Cited by 29 publications

(25 citation statements)

References 34 publications

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“…8a. The high-dynamic strength values of the specimens made of mortar could be reproduced for = 0.74 h, see [3] and Fig. 8a.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 81%

“…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%

“…Fundamental research in this area is based on the theory of propagation of stress waves and cracks through linear-elastic, isotropic media. An engineering-mechanics approach was used to develop a model for the high-dynamic compressive and tensile strength of specimens made of cement pastes, mortars, and concretes [3,[6][7][8]. Herein, the question is discussed whether or not it is possible to analyze concrete structures subjected to dynamic loading by means of commercial simulation software for quasi-static analysis, simply by introducing higher values of the strength.…”

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confidence: 99%

“…Setup of split Hopkinson pressure bars for testing of high-dynamic strength: a compression, and b tension Results from quasi-static and high-dynamic testing of specimens made from cementitious materials: a compressive strength values[6,26,27], and b tensile strength values[28,29] DIF values as a function of the strain rate; points refer to experimental data taken fromFig. 7, solid lines to the developed engineering-mechanics model: a compression tests analyzed in[3,6,7], and b tension tests analyzed in[8] …”

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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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“…8a. The high-dynamic strength values of the specimens made of mortar could be reproduced for = 0.74 h, see [3] and Fig. 8a.…”

Section: Results From Recent Fundamental Researchmentioning

confidence: 81%

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confidence: 99%

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confidence: 99%

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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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“…One-dimensional heat conduction occurs in the top slab, the bottom slab, and the lateral walls, except in the immediate vicinity of the columns and the walls, see Figures A1 and A2. Notably, the one-dimensional heat transfer problems could also be solved in a semi-analytical fashion, following e.g., Wang et al [66]. • Two-dimensional heat conduction occurs in the columns (Figures 13 and 15) and in the vicinity of the connections of the slabs with the columns and the walls.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

Numerical Analysis of a Moderate Fire inside a Segment of a Subway Station

et al. 2018

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A 1:4 scaled fire test of a segment of a subway station is analyzed by means of three-dimensional Finite Element simulations. The first 30 min of the test are considered to be representative of a moderate fire. Numerical sensitivity analyses are performed. As regards the thermal boundary conditions, a spatially uniform surface temperature history and three different piecewise uniform surface temperature histories are used. As regards the material behavior of concrete, a temperature-independent linear-elastic model and a temperature-dependent elasto-plastic model are used. Heat transfer within the reinforced concrete structure is simulated first. The computed temperature evolutions serve as input for thermomechanical simulations of the fire test. Numerical results are compared with experimental measurements. It is concluded that three sources of uncertainties render the numerical simulation of fire tests challenging: possible damage of the structure prior to testing, the actual distribution of the surface temperature during the test and the time-dependent high-temperature behavior of concrete. In addition, the simulations underline that even a moderate fire represents a severe load case, threatening the integrity of the reinforced concrete structure. Tensile cracking is likely to happen at the inaccessible outer surface of the underground structure. Thus, careful inspection is recommended even after non-catastrophic fires.

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A dehydration kinetic model of calcium silicate hydrates at high temperature

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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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Multiscale structural analysis inspired by exceptional load cases concerning the immersed tunnel of the Hong Kong-Zhuhai-Macao Bridge

Cited by 29 publications

References 34 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

Numerical Analysis of a Moderate Fire inside a Segment of a Subway Station

A dehydration kinetic model of calcium silicate hydrates at high temperature

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