Relevant bibliographies by topics / Concrete construction – Mathematical models

Academic literature on the topic 'Concrete construction – Mathematical models'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Concrete construction – Mathematical models"

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Zayed, Tarek M., and Ibrahim A. Nosair. "Cost management for concrete batch plant using stochastic mathematical models." Canadian Journal of Civil Engineering 33, no. 8 (August 1, 2006): 1065–74. http://dx.doi.org/10.1139/l06-051.

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Assessing productivity, cost, and delays are essential to manage any construction operation, particularly the concrete batch plant (CBP) operation. This paper focuses on assessing the above-mentioned items for the CBP using stochastic mathematical models. It aims at (i) identifying the potential sources of delay in the CBP operation; (ii) assessing their influence on production, efficiency, time, and cost; and (iii) determining each factor share in inflating the CBP concrete unit expense. Stochastic mathematical models were designed to accomplish the aforementioned objectives. Data were collected from five CBP sites in Indiana, USA, to implement and verify the designed models. Results show that delays due to management conditions have the highest probability of occurrence (0.43), expected value of delay percent (62.54% out of total delays), and relative delay percent. The expected value of efficiency for all plants is 86.53%; however, the average total expense is US$15.56/m3 (all currency are in US$). In addition, the expected value of effective expenses (EE) is $18.03/m3, resulting in extra expenses (XE) of $2.47/m3. This research is relevant to both industry practitioners and researchers. It develops models to determine the effect of delays on concrete unit cost. They are also beneficial to the CBP management.Key words: concrete batch plant, delays, management conditions, cost models, cost management, stochastic mathematical models.
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Folic, Radomir, Damir Zenunovic, and Nesib Residbegovic. "Strength of connections in precast concrete structures." Facta universitatis - series: Architecture and Civil Engineering 9, no. 2 (2011): 241–59. http://dx.doi.org/10.2298/fuace1102241f.

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The available experimental and numerical results of many studies of behavior of reinforced concrete connections for different stages of loading, up to fracture loading, are presented and analyzed in this paper. The problem of beam-column connection (or plate-wall connection) in prefabricated monolithic structures is emphasized. Fracture mechanisms of RC structures, the theoretical basis for their analysis, and the use of fracture mechanics in RC structures were also considered, as well as the mathematical models of prefabricated connections. In order to formulate an adequate mathematical model for calculating the connections, the dominant parameters influencing the behaviour of these connections were analyzed. A failure model for the prefabricated wall - monolithic RC plate connection was formulated. In building the model, the results of implemented experimental and numerical research of prefabricated connection in the MMS system from 2007 were used. Experiences with the implementation of the aforementioned construction system in structures in Tuzla, in the 1980's last century, were additionally used. The proposed mathematical models provide a sufficiently accurate failure assessment of prefabricated reinforced concrete connections.
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Murashkin, Vasily G. "Features of Nonlinear Deformation of Concrete." Scientific journal “ACADEMIA. ARCHITECTURE AND CONSTRUCTION”, no. 1 (March 18, 2019): 128–32. http://dx.doi.org/10.22337/2077-9038-2019-1-128-132.

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In most studies, when the problem of determining a nonlinear model of deformation of structural concrete in normal environment, or experienced a variety of destructive (aggressive, temperature, etc.) exposure, using individual mathematical apparatus and software. The main criterion in these works for the construction of the deformation model of concrete was a unique relationship "strength - modulus of elasticity". Apply the developed model for another type of concrete or experienced a destructive impact was erroneous. However, not all features of concrete deformation in the construction of models were taken into account. In particular, the gentle nature of deformation in the initial stage of loading was not taken into account. Similarly, models of nonlinear deformation of concrete in normative materials of different countries are constructed. Especially there are problems in the inspection of structures operated for along time. It is not rational to create individual models based on the algorithm created earlier. In recent studies, a number of works have noted the need to take into account the features of the initial stage ofloading of concrete and the fact that concrete from the beginning ofloading has macro and micro cracks and structural defects. But even in these works the possibility of creating a nonlinear deformation model based on experimentally obtained data when testing prototypes of generalized model was not considered. This article discusses the possibility of constructing a concrete extracted from the structure. The possibility of replacing the individual deformation models with the proposed one is shown. In the generalized model of deformation "strength and modulus of elasticity" may not coincide with the normative characteristics and it can serve as a basis for determining the stress state in the survey of operated structures and, if necessary, for the design of new ones.
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Vojtasik, Karel, Eva Hrubesova, Marek Mohyla, and Lukáš Duris. "Design and Evaluation of a Subterranean Work Lining from Layers of Shotcrete and Steel Arch." Advanced Materials Research 1020 (October 2014): 347–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.347.

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A steel concrete lining is today the common ground massive retaining structure implemented shortly after the excavation of an opening. The constituent elements of the steel concrete lining are layers of shotcrete and steel arch frames. This simple structure has many unique features which set it apart from the conventional reinforced concrete constructions. Without simplification these features doesn’t allow to carry out design and evaluation of steel concrete lining by relevant design and evaluation methods convenient to the conventional reinforced concrete constructions. The main differences are construction process, yielding curve of structure and determination of external load. In the case of a steel concrete lining its external load is product of mutual work of both the ground massive and the lining. The value of load depends on the yielding curves of the lining and the ground massive. The yielding curve of a ground massive is objective and conditioned on strength strain properties of ground massive and primary stress state. The yielding curve of a steel concrete lining relates lining design specification. The process of construction affects the value of load too. The article analyzes the steel concrete lining focusing the influence of lining design parameters on its yielding curve. It looks for a way to control the ground massive behavior and as well as to engage it more in an effort with lining to stabilize subterranean work. The themes of the analysis are: static and deformation parameters of the cross-section of the steel concrete lining with regard to the construction stage and dependency of hardening shotcrete; interaction between of steel concrete lining and ground massive based on yielding curves; assessment of a stress state across the steel concrete lining section in the steel concrete lining constituent elements. The analysis is carried out on mathematical models that combine analytical and numerical methods.
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Ouahmane, Issam, Rachid El Alaiji, Mohammed Sallaou, and Larbi Lasri. "General Mathematical Model for Analysing the Bending Behaviour of Rectangular Concrete Beams with Steel, Fibre-Reinforced Polymers (FRP) and Hybrid FRP–Steel Reinforcements." Buildings 12, no. 11 (November 12, 2022): 1964. http://dx.doi.org/10.3390/buildings12111964.

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The design guidelines available in building codes for steel and fibre reinforced polymer (FRP) reinforced concrete (RC) beams have been developed on the basis of empirical models. While these models are successfully used for practical purposes, they require continuous improvements with more experimental data. This paper aims to develop a general mathematical model derived from the intrinsic material properties of concrete and certain reinforcements to analyse the bending behaviour of reinforced concrete beams. The proposed model takes into account the effects of non-linearity and ductility on the real behaviour of concrete under compression as well as the concrete tension stiffening. The model focused on analysing the flexural behaviour of rectangular steel, FRP and hybrid FRP–steel RC beams, using the moment–curvature relationship. A general static equilibrium equation was developed and mathematically solved with precise methods to establish a moment–curvature relationship. The effective flexural stiffness (EFS) is therefore calculated by the slope of the moment–curvature diagram, and then the load–deflection response is immediately deduced according to the loading conditions. The present model results were compared with numerous test data reported by various researchers. The comparisons reveal a good accuracy for predicting the EFS and load–deflection response for either steel, FRP, and hybrid reinforced concrete beams, with an error average less than 10%.
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Velichkin, Vladimir, Vladimir Zavyalov, Elena Solodovnikova, and Elena Filippova. "Mathematical descriptions of heat-mass-exchange processes in construction industry at control automation." E3S Web of Conferences 97 (2019): 06021. http://dx.doi.org/10.1051/e3sconf/20199706021.

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The paper covers matters arising in building mathematical model of processes at thermal treatment of construction materials. On the basis of analysis of heat energy and moisture flows in intermittent steam chamber and continuous tunnel drying chamber, analytic and structure models of heat-mass-exchange processes in processing vessels are drawn. The structural model of heat-mass-exchange processes allowed to evaluate the relationship of heat energy and moisture flows at heat treatment processes for gypsum and reinforced-concrete articles. The resulting system of interrelated differential equations is based on a structural model. Analytical studies showed that the considering heat treatment units are characterized by non-stationary, non-linear, stochastic and distributed technological parameters. An experimental study of technological devices has shown that in a limited time range, the processes of heat-mass-exchange can be characterized by a system of linear differential equations with constant coefficients with sufficient accuracy for practice. Acceptable allowances and simplifying assumptions at analytical description of heat-mass-exchange processes in processing vessels are considered. As a result of performed research, various mathematical forms (differential equation system, matrix and operator forms) of mathematical models of processing vessels are obtained. The built mathematical models may be applied for constructing the processing vessels with preset dynamic properties, as well for control-system designing by those vessels.
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Ye, Zheng Mao, Lian Cong Zheng, Li Hua Wan, and Xin Cheng. "Application of Second Law of Fick in NaCl Attack of Sulphoaluminate Cement." Advanced Materials Research 306-307 (August 2011): 1038–41. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1038.

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The standard diffusion calculating model is one of the models widely used to predict the concrete construction life in chloride environment. According to test results, the surface concentration and the initial concentration of chloride ion on sulphoaluminate cement sample was analyzed by mathematical method. Life prediction model in chloride environment was built. According to the model, the sulphoaluminate cement construction life will be 51.5 years when the thickness of cement protective layer is 40mm.
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Kovačević, Miljan, Nenad Ivanišević, Dragan Stević, Ljiljana Milić Marković, Borko Bulajić, Ljubo Marković, and Nikola Gvozdović. "Decision-Support System for Estimating Resource Consumption in Bridge Construction Based on Machine Learning." Axioms 12, no. 1 (December 24, 2022): 19. http://dx.doi.org/10.3390/axioms12010019.

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The paper presents and analyzes the state-of-the-art machine learning techniques that can be applied as a decision-support system in the estimation of resource consumption in the construction of reinforced concrete and prestressed concrete road bridges. The formed database on the consumption of concrete in the construction of bridges, along with their project characteristics, was the basis for the formation of the assessment model. The models were built using information from 181 reinforced concrete bridges in the eastern and southern branches of Corridor X in Serbia, with a value of more than 100 million euros. The application of artificial neural network models (ANNs), models based on regression trees (RTs), models based on support vector machines (SVM), and Gaussian processes regression (GPR) were analyzed. The accuracy of each model is determined by multi-criterion evaluation against four accuracy criteria root mean square error (RMSE), mean absolute error (MAE), Pearson’s linear correlation coefficient (R), and mean absolute percentage error (MAPE). According to all established criteria, the model based on GPR demonstrated the greatest accuracy in calculating the concrete consumption of bridges. According to the study, using automatic relevance determination (ARD) covariance functions results in the most accurate and optimal models and also makes it possible to see how important each input variable is to the model’s accuracy.
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RYAZANOVA, Galina N., Irina O. KOROTYCH, and Anastasia Yu PROKOPYEVA. "MATHEMATICAL AND TECHNOLOGICAL MODELING FOR SOLVING OF PROBLEMS OF THE TECHNOLOGY OF CONSTRUCTION OF ENVELOPES FROM NO-FINE EXPANDED-CLAY CONCRETE IN A PERMANENT FORM." Urban construction and architecture 7, no. 1 (March 15, 2017): 30–35. http://dx.doi.org/10.17673/vestnik.2017.01.5.

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The article views the problems of construction of envelope structures from no-fi ne expanded-clay concrete in a permanent form made from cement-bonded boards and due to the complexity of the technological problems associated with the processes of mixing and laying of light concrete mixture into the form that are solved by methods of mathematical modeling. The main technological challenges in the construction of structures made of no-fi ne expanded-clay concrete are considered. Specifi c volumes of aggregates and cement glue and their mass are theoretically and numerically determined. Control parameters and functions are studied to calculate the saturation depth of the aggregate grains. The links of relative depth impregnation dR / R of eff ective porosity of diff erent structures are derived. The conclusions about further implementation of the models and their research are made.
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Dvorkin, Leonid, and Vitalij Marchuk. "Dry mixes on the basis of reactive-powder concrete." Zastita materijala 63, no. 3 (2022): 309–17. http://dx.doi.org/10.5937/zasmat2203309d.

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This article presents the results of experimental studies of mortars based on dry mixes using reactive-powder concrete (RPC). This type of concrete can serve not only as the structural material in the construction of buildings and structures, but also as a semi-finished product for obtaining dry building mixes for various purposes. Redispersed polymer powder as well as fly ash according to the results of the conducted research can be used as additional components for the preparation of various dry building mixes. For development of compositions of dry mixes used the statistical models received by means of mathematical planning of experiments.
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Dissertations / Theses on the topic "Concrete construction – Mathematical models"

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Hon, Alan 1976. "Compressive membrane action in reinforced concrete beam-and-slab bridge decks." Monash University, Dept. of Civil Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/5629.

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Liu, Chi-hong, and 廖志航. "Time-dependent behaviour of concrete structures with special referenceto podium and frame structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38674245.

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Lam, Wai-yin, and 林慧賢. "Plate-reinforced composite coupling beams: experimental and numerical studies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37311797.

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Ng, Pui-lam, and 吳沛林. "Constitutive modelling and finite element analysis of reinforced concrete structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B3897566X.

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Choi, Joonho. "Concurrent fire dynamic models and thermomechanical analysis of steel and concrete structures." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26679.

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Thölken, Denise. "Efeito da rigidez de pilar parede no comportamento sísmico de edifício de concreto armado." Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/962.

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Este trabalho tem como objeto o estudo do efeito da rigidez de pilar parede no comportamento estrutural de edifícios de concreto armado submetidos a sismos. Foram consideradas as premissas da norma brasileira ABNT NBR15421:2006, que apresenta os critérios para projeto de estruturas resistentes a sismo. A análise linear com emprego dos métodos da norma - método das forças horizontais equivalentes, método espectral e histórico de aceleração no tempo - foi aplicada em edifícios com dois tipos de sistemas estruturais, sendo eles pórtico de concreto e sistema dual pórtico de concreto e pilar parede. Os resultados foram analisados nos pórticos de extremidade das estruturas nos sentidos longitudinal (x) e transversal (y), comparando-se os deslocamentos de cada pavimento e esforços cortantes, momento fletor e normal nas bases dos pilares. A comparação foi realizada entre os três métodos aplicados e os sistemas estruturais analisados.
The aim of this work is to study the stiffness effect of wall columns on structural behavior of reinforced concrete buildings subjected to seismic action. The premises of the Brazilian standard ABNT NBR14521:2006 were considered, which presents criteria for earthquake resistant design of structures. The linear analysis employed the methods of the Brazilian standard - equivalent static load method, response spectrum analysis and time history method - were applied to buildings with two types of structural systems, namely concrete frame and dual system concrete frame and wall columns. The results were analyzed in edge frames structures in the longitudinal and transverse directions, comparing the displacement of each floor and shear, bending moment and axial forces on the bases of the columns. A comparison was made between the three methods applied and the structural systems analyzed.
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Destrebecq, Jean-François. "Modele d'endommagement d'elements de structures en beton soumis a des sollicitations de fatigue." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF21070.

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A partir d'une etude bibliographique, elaboration d'un modele de comportement a la fatigue, base sur la theorie de l'endommagement, pour chacun des materiaux constitutifs du beton arme. Resolution numerique apres discretisation des equations d'equilibre une section de poudre fissuree endommagee, equations ramenees a celles d'une section fictive elastique homogene. Sous forme adimensionnelle, le modele permet d'obtenir les courbes s-n de sections flechies ne dependant que du pourcentage d'armatures dans la section: influence de ce pourcentage
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Wares, Arsalan Jones Graham A. Cottrill James F. "Middle school students' construction of mathematical models." Normal, Ill. Illinois State University, 2001. http://wwwlib.umi.com/cr/ilstu/fullcit?p3064487.

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Thesis (Ph. D.)--Illinois State University, 2001.
Title from title page screen, viewed March 30, 2006. Dissertation Committee: Graham A. Jones, James Cottrill (co-chairs), Linnea Sennott. Includes bibliographical references (leaves 107-111) and abstract. Also available in print.
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Khadka, Chandra. "PENALIZED REGRESSION MODELS FOR CONCRETE STRENGTH ESTIMATION." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/theses/2818.

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Concrete compressive strength is one of the most important material properties affectingthe design of concrete structures. Strength that will be achieved once the concrete sets should be correctly predicted prior to pouring the concrete. Regression techniques can be used to calculate the 28-day concrete strength with a level of certainty. This thesis deals with the data modelling and analysis of 28-day compressive strength of high-performance concrete. Historical data on various mix compositions of high-performance concrete was obtained from University of California, Irvine repository. The data had 8 predictors and 1 response variable. In this thesis, three penalized regression approaches, namely, ridge, lasso, and elastic net were used to create a predictive model for compressive strength, and the performance of these model were compared to the traditional multiple linear regression model. Holdout sets from 2% to 40% at an increment of 2% were taken. Every regression algorithm was designed to conduct regression on 30 sets of randomly partitioned data. The performance of models was assessed using coefficient of multiple determination, RMSE, and residual plots. All regression techniques were able to predict the concrete strength with about 75% accuracy level.
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Keenan, David Wayne 1955. "BLOCK PLAN CONSTRUCTION FROM A DELTAHEDRON-BASED ADJACENCY GRAPH." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/292025.

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Books on the topic "Concrete construction – Mathematical models"

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Concrete and concrete structures: Numerical modelling and applications. London: Elsevier Applied Science, 1989.

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Dynamic behavior of concrete structures. Amsterdam: Elsevier, 1994.

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Lazić, Vera B. Mathematical theory of composite and prestressed structures. Beograd: Matematički institut SANU, 2003.

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A, Pimanmas, and Okamura Hajime 1938-, eds. Nonlinear mechanics of reinforced concrete. New York: Spon Press, 2003.

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Tetsuya, Ishida, and Kishi Toshiharu 1955-, eds. Multi-scale modelling of structural concrete. London: Taylor & Francis, 2008.

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Tekkin konkurīto kōzō no sekkei. Tōkyō: Morikita Shuppan, 2001.

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IABSE Colloquium (1987 Delft, Netherlands). Computational mechanics of concrete structures: Advances and applications : report. Zürich, Switzerland: IABSE, 1987.

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(undifferentiated), Walter Kaufmann. Strength and deformations of structural concrete subjected to in-plane shear and normal forces. Basel: Birkhäuser Verlag, 1998.

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Grasty, R. L. The design, construction, and application of concrete models for calibrating borehole gamma-ray spectrometers. Ottawa, Canada: Geological Survey of Canada, 1993.

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USSD Committee on Earthquakes. Numerical models for seismic evaluation of concrete dams: Review, evaluation and interpretation of results. Denver, CO: U.S. Society on Dams, 2008.

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Book chapters on the topic "Concrete construction – Mathematical models"

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Prodan, Emil. "Electron Dynamics: Concrete Physical Models." In SpringerBriefs in Mathematical Physics, 11–24. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55023-7_2.

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Baldwin, John T. "The Construction of Many Nonisomorphic Models." In Perspectives in Mathematical Logic, 283–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-07330-8_14.

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Zalamea, Fernando. "The Dialectics Archetypes/Types (Universal Categorical Constructions/Concrete Models) in the Work of Alexander Grothendieck." In Model and Mathematics: From the 19th to the 21st Century, 267–75. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97833-4_8.

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AbstractWe present two basic directions that Grothendieck explores in the transit between archetypes (universal categorical constructions) and types (concrete models): (1) projecting archetypes to types in the 1950s (around the Tôhoku and Riemann-Roch), (2) embedding types into archetypes in the 1980s (around Pursuing Stacks and Dérivateurs). We also discuss (3) his general remarks about “models” in Récoltes et semailles.
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Kalashnikov, V. V., and S. T. Rachev. "Simplification and Approximation of Probability Models." In Mathematical Methods for Construction of Queueing Models, 348–97. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1475-2_8.

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Sannella, Donald, and Andrzej Tarlecki. "Mind the gap! Abstract versus concrete models of specifications." In Mathematical Foundations of Computer Science 1996, 114–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-61550-4_143.

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Kalashnikov, V. V., and S. T. Rachev. "Characterization of the Components of Queueing Models." In Mathematical Methods for Construction of Queueing Models, 125–201. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1475-2_4.

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Bergan, Pål G., Arne Arnesen, and Olav Fyrileiv. "Computational Applications of Alternative Mathematical Models for Reinforced Concrete." In Computational Mechanics ’95, 2334–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79654-8_388.

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Kalashnikov, V. V., and S. T. Rachev. "Substantive Formulation of the Problem of Queueing Model Construction." In Mathematical Methods for Construction of Queueing Models, 1–16. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1475-2_1.

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Kalashnikov, V. V., and S. T. Rachev. "The Concept of Characterization as a General Mathematical Schema for Constructing Queueing Models." In Mathematical Methods for Construction of Queueing Models, 17–47. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1475-2_2.

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Kalashnikov, V. V., and S. T. Rachev. "Probability Metrics." In Mathematical Methods for Construction of Queueing Models, 48–124. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1475-2_3.

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Conference papers on the topic "Concrete construction – Mathematical models"

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Goncalves, D. E., J. D. Sanjuan, S. E. Di´az, and M. Pacheco. "Experimental Construction of Reduced Mathematical Models of Rotating Equipments in Operation." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38753.

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An experimental method is proposed to obtain simplified mathematical models of rotating equipment systems. The Instrumental Variable Filter (IVF) method is applied to estimate mass, damping and stiffness force coefficients within a frequency range, through experimental measurements. This method is based on the least squares approximation technique and it uses analytical weight functions to reduce the effect of noise in the measurements. The experimental data is obtained for different configurations of rotating equipments, which consist of rigid wheels, a flexible shaft supported by bushing bearings, an electrical motor, a base-plate, and a concrete foundation. Frequency response functions (FRF) were obtained by impact excitation techniques. In the tests, the unbalanced response measurements were compared with the ones predicted by the IVF model. The method allows the study of mass, damping and stiffness force coefficients as a function of excitation frequency. Linearities and non-linearities of phenomena are identified, and the method sums up all the individual components into a definition for the system. The tests were conducted by operating, or not, the motor, in order to evaluate the IVF method in both cases. The high correlation between the IVF (FRF, and unbalance responses) and the actual measurements of the FRF and unbalance responses, shows that the method generates useful mathematical models of dynamic systems, that can have industrial applications. Modal analysis methods were used to compare the natural frequencies and the damping ratios, obtained by dynamic coefficients estimation.
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Wang, Zhongjie, Shaoqiang Zhang, Yangxun Ou, Gaojie Zhong, Ao Wang, Zongkai Zhang, and Limin Sun. "Study on temperature field effects on RC high-pier bridge." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.0376.

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<p>Temperature is one of the essential factors that cause dynamic characteristics changes in concrete bridges. However, the study of temperature-induced structural frequency changes relies on a large number of measured data to establish a frequency-temperature mathematical model. The selection of temperature variables is arbitrary. This paper takes a concrete high-pier rigid-framed bridge under construction in China as the research object. Based on the continuous 120-day measured weather data at the bridge site, the finite element method (FEM) is used to simulate the bridge's temperature and frequency history without considering the crack and other damage conditions. A regression analysis model of frequency and temperature variables was established. The study found that the selection of temperature variables and mathematical models influences the frequency-temperature mathematical relationship; for high-pier bridges. Establishing a multiple linear regression model with air temperature and point temperature of the main girder and piers as variables can obtain an ideal fitting result.</p>
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Wang, Zhongjie, Shaoqiang Zhang, Yangxun Ou, Gaojie Zhong, Ao Wang, Zongkai Zhang, and Limin Sun. "Study on temperature field effects on RC high-pier bridge." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.0376.

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<p>Temperature is one of the essential factors that cause dynamic characteristics changes in concrete bridges. However, the study of temperature-induced structural frequency changes relies on a large number of measured data to establish a frequency-temperature mathematical model. The selection of temperature variables is arbitrary. This paper takes a concrete high-pier rigid-framed bridge under construction in China as the research object. Based on the continuous 120-day measured weather data at the bridge site, the finite element method (FEM) is used to simulate the bridge's temperature and frequency history without considering the crack and other damage conditions. A regression analysis model of frequency and temperature variables was established. The study found that the selection of temperature variables and mathematical models influences the frequency-temperature mathematical relationship; for high-pier bridges. Establishing a multiple linear regression model with air temperature and point temperature of the main girder and piers as variables can obtain an ideal fitting result.</p>
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Tortoriello, Miguel A., Luis J. Lima, Ana C. Cobas, and Renso A. Cichero. "Timber bodies strength of materials: Fundamental principles, test specimens proposal." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.1112.

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<p>To reduce the economic cost of a Timber Structure, the first condition is to have a “rational” Structural Code, that is, a Code supported by research and a specific theory. To establish a rational Structural Timber Code, a specific theoretical support is needed. The objective of this paper is to cooperate in the construction of this theoretical support. To design timber structures, it is necessary to have mathematical models able to reproduce the resistance of timber bodies under different solicitations. In this paper, a “road map” to arrive to a specific Strength of Materials of Timber Bodies is proposed. This theory will be the tool needed to develop the mathematical models whose quantification will be obtained by testing “basic test specimens” obtained from timber of any particular timber building (like in concrete or soil mechanics). Finally, a “basic test specimen” for practical application of the theory is proposed. In this case, the experimental support is referred to “willow” wood.</p>
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Séquin, Carlo H. "Interactive construction of 3D mathematical visualization models." In Symposium on Interactive 3D Graphics and Games. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/1944745.1944786.

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Haldar, Malay, Gagandeep Singh, Saurabh Prabhakar, Basant Dwivedi, and Antara Ghosh. "Construction of concrete verification models from C++." In the 45th annual conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1391469.1391707.

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Apandi, Nazirah Mohd, Chau-Khun Ma, Abdullah Zawawi Awang, and Wahid Omar. "Compressive strength models of repaired concrete structures." In PROCEEDINGS OF THE 3RD INTERNATIONAL CONFERENCE ON CONSTRUCTION AND BUILDING ENGINEERING (ICONBUILD) 2017: Smart Construction Towards Global Challenges. Author(s), 2017. http://dx.doi.org/10.1063/1.5011491.

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Contreras-Nieto, Cristian, Phil Lewis, and Yongwei Shan. "Developing Predictive Models of Superstructure Ratings for Steel and Prestressed Concrete Bridges." In Construction Research Congress 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784479827.087.

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Lankin, A., S. Gladkikh, and N. Narakidze. "Construction of Mathematical Models for Predictive Diagnostics of Electromagnetic Drives." In 2021 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM). IEEE, 2021. http://dx.doi.org/10.1109/icieam51226.2021.9446368.

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Afsari, Kereshmeh, and Charles Eastman. "Consolidated Exchange Models for Implementing Precast Concrete Model View Definition." In 33th International Symposium on Automation and Robotics in Construction. International Association for Automation and Robotics in Construction (IAARC), 2016. http://dx.doi.org/10.22260/isarc2016/0127.

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Reports on the topic "Concrete construction – Mathematical models"

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He, Rui, Na (Luna) Lu, and Jan Olek. Development of In-Situ Sensing Method for the Monitoring of Water-Cement (w/c) Values and the Effectiveness of Curing Concrete. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317377.

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As the most widely used construction material, concrete is very durable and can provide long service life without extensive maintenance. The strength and durability of concrete are primarily influenced by the initial water-cement ratio value (w/c), and the curing condition during the hardening process also influences its performance. The w/c value is defined as the total mass of free water that can be consumed by hydration divided by the total mass of cement and any additional pozzolanic material such as fly ash, slag, silica fume. Once placed, field concrete pavements are routinely cured with liquid membrane-forming compounds. For laboratory study, concrete samples are usually cured in saturated lime water or a curing room with a relative humidity (RH) value higher than 95%. Thus, the effectiveness of curing compounds for field concrete needs to be studied. In this study, the dielectric constant value of plastic concrete was measured by ground penetrating radar (GPR). The w/c value of the plastic concrete was calculated by a mathematical model from the measured dielectric constant value. The calculated w/c value was compared with the microwave oven drying measurement determined result in AASHTO T318. A modified coarse aggregate correction factor was proposed and applied in microwave oven drying measurement to determine the w/c value of plastic concrete in AASHTO T318. The effectiveness of curing compound was evaluated by field concrete slabs by GPR measurement. It was found that GPR can be a promising NDT method for In this study, the dielectric constant value of plastic concrete was measured by ground penetrating radar (GPR). The w/c value of the plastic concrete was calculated by a mathematical model from the measured dielectric constant value. The calculated w/c value was compared with the microwave oven drying measurement determined result in AASHTO T318. A modified coarse aggregate correction factor was proposed and applied in microwave oven drying measurement to determine the w/c value of plastic concrete in AASHTO T318. The effectiveness of curing compound was evaluated by field concrete slabs by GPR measurement. It was found that GPR can be a promising NDT method for w/c determination of plastic concrete and curing effectiveness evaluation method for hardened concrete.
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Grasty, R. L., and Y. B. Blanchard. The design, construction, and application of concrete models for calibrating borehole gamma-ray spectrometers. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193320.

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DeSantis, John, and Jeffery Roesler. Longitudinal Cracking Investigation on I-72 Experimental Unbonded Concrete Overlay. Illinois Center for Transportation, February 2022. http://dx.doi.org/10.36501/0197-9191/22-002.

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A research study investigated longitudinal cracking developing along an experimental unbonded concrete overlay (UBOL) on I-72 near Riverton, Illinois. The project evaluated existing literature on UBOL (design, construction, and performance), UBOL case studies, and mechanistic-empirical design procedures for defining the mechanisms that are contributing to the observed distresses. Detailed distress surveys and coring were conducted to assess the extent of the longitudinal cracking and faulting along the longitudinal lane-shoulder joint. Coring over the transverse contraction joints in the driving lane showed stripping and erosion of the dense-graded hot-mix asphalt (HMA) interlayer was the primary mechanism initiating the longitudinal cracks. Cores from the lane-shoulder joint confirmed stripping and erosion was also occurring there and leading to the elevation difference between the driving lane and shoulder. Field sections by surrounding state departments of transportation (DOTs), such as Iowa, Michigan, Minnesota, Missouri, and Pennsylvania, with similar UBOL design features to the I-72 section were examined. Site visits were performed in Illinois, Michigan, Minnesota, and Pennsylvania, while other sections were reviewed via state DOT contacts as well as Google Earth and Maps. Evidence from other DOTs suggested that HMA interlayers, whether dense graded or drainable, could experience stripping, erosion, and instability under certain conditions. An existing performance test for interlayers, i.e., Hamburg wheel-tracking device, and current models reviewed were not able to predict the distresses on I-72 eastbound. Adapting a dynamic cylinder test is a next step to screen HMA interlayers (or other stabilized layers) for stripping and erosion potential. To slow down the cracking and faulting on I-72 eastbound, sealing of the longitudinal lane-shoulder joint and driving lane transverse joints is suggested. To maximize UBOL service life, an HMA overlay will minimize water infiltration into the interlayer system and significantly slow down the HMA stripping and erosion mechanism that has led to longitudinal cracking and lane-shoulder faulting.
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Hlushak, Oksana M., Svetlana O. Semenyaka, Volodymyr V. Proshkin, Stanislav V. Sapozhnykov, and Oksana S. Lytvyn. The usage of digital technologies in the university training of future bachelors (having been based on the data of mathematical subjects). [б. в.], July 2020. http://dx.doi.org/10.31812/123456789/3860.

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This article demonstrates that mathematics in the system of higher education has outgrown the status of the general education subject and should become an integral part of the professional training of future bachelors, including economists, on the basis of intersubject connection with special subjects. Such aspects as the importance of improving the scientific and methodological support of mathematical training of students by means of digital technologies are revealed. It is specified that in order to implement the task of qualified training of students learning econometrics and economic and mathematical modeling, it is necessary to use digital technologies in two directions: for the organization of electronic educational space and in the process of solving applied problems at the junction of the branches of economics and mathematics. The advantages of using e-learning courses in the educational process are presented (such as providing individualization of the educational process in accordance with the needs, characteristics and capabilities of students; improving the quality and efficiency of the educational process; ensuring systematic monitoring of the educational quality). The unified structures of “Econometrics”, “Economic and mathematical modeling” based on the Moodle platform are the following ones. The article presents the results of the pedagogical experiment on the attitude of students to the use of e-learning course (ELC) in the educational process of Borys Grinchenko Kyiv University and Alfred Nobel University (Dnipro city). We found that the following metrics need improvement: availability of time-appropriate mathematical materials; individual approach in training; students’ self-expression and the development of their creativity in the e-learning process. The following opportunities are brought to light the possibilities of digital technologies for the construction and research of econometric models (based on the problem of dependence of the level of the Ukrainian population employment). Various stages of building and testing of the econometric model are characterized: identification of variables, specification of the model, parameterization and verification of the statistical significance of the obtained results.
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FINITE ELEMENT SIMULATION FOR ULTRA-HIGH-PERFORMANCE CONCRETE-FILLED DOUBLE-SKIN TUBES EXPOSED TO FIRE. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.263.

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Ultra-high-performance concrete (UHPC) or ultra-high-strength concrete (UHSC) are alternatively used to reduce construction materials, thereby achieving more sustainable constructions. Moreover, engaging the advantages of concrete cores and outer steel tubes in concrete-filled steel tubes (CFST) or ductile concrete-filled double-skin tubes (CFDST) is of great interest for the better performance of such members under fire. Nevertheless, current design provisions do not provide design models for UHPC-filled double-skin tubes under fire, and existing finite-element (FE) methodologies available in the literature may not accurately simulate the behaviour of CFDST exposed to fire. Therefore, this paper develops a comprehensive FE protocol implementing the scripting technique to model CFDST members for heat transfer and coupled (simultaneously or sequentially) thermal-stress analyses. Various modelling parameters incorporated in the proposed FE routine include the cross-sectional geometry (circular, elliptical, hexagonal, octagonal, and rectangular), the size (width, diameter, and wall thickness), interactions, meshing, thermal- and mechanical-material properties, and boundary conditions. The detailed algorithm for heat transfer analysis is presented and elaborated via a flow chart. Validations, verifications, and robustness of the developed FE models are established based on extensive comparison studies with existing fire tests available in the literature. As a result, and to recognize the value of the current FE methodology, an extensive parametric study is conducted for different affecting parameters (e.g., nominal steel ratio, hollowness ratio, concrete cylindrical strength, yield strength of metal tubes, and width-to-thickness ratio). Extensive FE results are used for optimizing the fire design of such members. Consequently, a simplified and accurate analytical model that can provide the axial load capacity of CFDST columns under different fire ratings is presented
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