Numerical simulation and analysis of the temperature effect on the fission of concrete

Liu, Guangcheng

doi:10.2298/tsci181209184l

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…In conclusion, we have the following: (1) e temperature distribution law and the variation process of schemes 1 and 2 are consistent with the understanding of relevant literatures [1,15]. (2) When the element type is the same, if the mesh size is too large, the surface temperature range of concrete is small, and the calculated value of temperature influence depth is large.…”

Section: Sensitivity Analysis Of Element Type and Mesh Sizesupporting

confidence: 86%

“…In summary, the following conclusions could be drawn: (1) Air temperature changes in winter had greater influence on the thermal field of concrete; in other words, the concrete had sensitive temperature changes to temperature drop, a similar conclusion was obtained in reference [15]. (2) e longer the action time of the temperature difference, the greater depth of concrete affected by the temperature, but to be kept unchanged after reaching a certain depth.…”

Section: Results Analysis Of Ermal Fieldsupporting

confidence: 69%

“…To date, lots of achievements [3] related to thermal stress and temperature cracks of concrete dams mainly are focused on the influence of the diurnal temperature variation during the construction [8,9], and the annual temperature [10], seasonal temperature variations [4,11,12], solar radiation [13,14], and water temperature variations [1] during the operation. e results show that the cold wave or the diurnal temperature variation will affect the thermal field within a certain range below the concrete surface and lead to the surface cracks [15].…”

Section: Introductionmentioning

confidence: 92%

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FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

et al. 2021

Advances in Civil Engineering

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In order to make clear the cracking reasons in arch dam of Xiaowan Hydropower Station during operation period, the approach to combine ANSYS with finite element program COCE-3D is adopted. Firstly, the influence by element type and mesh size for the temperature field simulation result is analyzed. Subsequently, the three typical dam segments cut from Xiaowan arch dam are selected and the relevant finite element model is established; the effect of the measured diurnal air temperature on temperature field and temperature stress of arch dam is analyzed thoroughly. The results indicate that the temperature gradient in mass concrete becomes lower, whereas the affecting depth becomes deeper when the mesh size is too large. Therefore, it is advisable to use smaller size mesh to study the influence of the measured diurnal air temperature on the surface temperature distribution in mass concrete. The temperature of downstream zone in arch dam is significantly affected by air temperature; the changing laws of temperature field and temperature stress with the air temperature are basically consistent, which is sensitive to lower temperature. When the temperature sharply decreased, the temperature stress in the downstream zone is mainly in tensile stress state. The calculated results are basically consistent with the measured results, and the temperature stress induced by the day-night temperature difference is the important reason for the horizontal cracks on the downstream surface. The submodel analysis method is an important alternative approach to study the changing laws of temperature field of arch dam. The research results not only provide an evidence for temperature control and crack prevention of Xiaowan arch dam but also provide a reference for temperature field simulation of similar projects.

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Section: Sensitivity Analysis Of Element Type and Mesh Sizesupporting

confidence: 86%

Section: Results Analysis Of Ermal Fieldsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

et al. 2021

Advances in Civil Engineering

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“…Equation (1) can be easily solved by a numerical method (Li and He, 2019; Alizadeh et al , 2018; Liu, 2019; Pirmohammadi, 2019; Bilige and Han, 2018), and it can be solved by many analytical methods, for example, the variational method, the variational iteration method (He and Latifizadeh, 2020; Anjum and He, 2019; He et al , 2014), the homotopy perturbation method (Yu et al , 2019; Ren et al , 2019; Ban and Cui, 2018; Wu and He, 2018) and Taylor series method (He and Ji, 2019b; He et al , 2019; He, 2019a; Khan, 2018). In this paper, we will apply the exp-function method (He, 2012; He, 2013; He and Wu, 2006; Jia et al , 2015) to study the solution properties at different scales.…”

Section: Kdv – Burgers Equation and Its Solution Propertymentioning

confidence: 99%

Difference equation vs differential equation on different scales

Sedighi

2020

HFF

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Purpose The purpose of this paper is to demonstrate that the numerical method is not everything for nonlinear equations. Some properties cannot be revealed numerically; an example is used to elucidate the fact. Design/methodology/approach A variational principle is established for the generalized KdV – Burgers equation by the semi-inverse method, and the equation is solved analytically by the exp-function method, and some exact solutions are obtained, including blowup solutions and discontinuous solutions. The solution morphologies are studied by illustrations using different scales. Findings Solitary solution is the basic property of nonlinear wave equations. This paper finds some new properties of the KdV–Burgers equation, which have not been reported in open literature and cannot be effectively elucidated by numerical methods. When the solitary solution or the blowup solution is observed on a much small scale, their discontinuous property is first found. Originality/value The variational principle can explain the blowup and discontinuous properties of a nonlinear wave equation, and the exp-function method is a good candidate to reveal the solution properties.

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“…The relevant parameters are listed in Table 5. Based on previous research and available literature, the numerical calculation method based on equivalent age proposed in this study has higher accuracy than the traditional numerical calculation method [21,37], which does not consider the influence of hydration heat on the heat transfer parameters of concrete. As for a traditional model, it is established by the traditional numerical calculation method, which does not consider the influence of the hydration reaction on the heat transfer parameters of concrete.…”

Section: Model Validationmentioning

confidence: 99%

Evolution and Parametric Analysis of Concrete Temperature Field Induced by Electric Heating Curing in Winter

Han,

Liu,

Zuo

et al. 2023

Sustainability

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Electric heat treatment is a widely used concrete curing method during the winter. Through direct and indirect heat exchange, the electric heating system tracks and controls the temperature of the heating medium based on a positive temperature coefficient (PTC) effect. In this study, to standardize the application of this treatment in the winter curing of concrete, the thermal energy conversion of an electric heating system and the heat-transfer characteristics of concrete have been studied. Based on the theoretical derivation, a calculation model of the relationship between the thermal energy of the electric heating system and the temperature of the concrete is established. The model is verified using the concrete heating and curing test results. The numerical analysis program COMSOL is used to analyze the effects of various factors on the concrete temperature field, including the electric heating power (e.g., the surface temperature of the electric heating system), concrete casting temperature, thermal conductivity, and heat release coefficient. The results show that decreasing the surface exothermic coefficient and increasing the heating temperature will significantly increase the peak temperature of the concrete. When the heat source temperature increases by 20 °C, the peak temperature could increase by approximately 13 °C. When the heating stops, the concrete volume increases temporarily, particularly in the region where the heating cable is buried. Consequently, an excessive heating power increase may cause cracks on the concrete surface. Compared with the factors of thermal conductivity and surface exothermic coefficient, the ambient temperature has the most significant effect on the concrete cooling rate when the heating stops. When the ambient temperature decreases by −20 °C, the cooling rate of concrete increases by 0.72 °C/h. The role of concrete insulation materials needs to be strengthened to reduce cooling rates during power outages and form removal. The findings from the study provide industry practitioners with a comprehensive guide regarding the specific applications of the electric heating system in early-age concrete curing.

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Numerical simulation and analysis of the temperature effect on the fission of concrete

Cited by 5 publications

References 12 publications

FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

Difference equation vs differential equation on different scales

Evolution and Parametric Analysis of Concrete Temperature Field Induced by Electric Heating Curing in Winter

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