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On the added value of multi-scale modeling of concrete

Frontiers of Structural and Civil Engineering 2022年第1期16卷 1-23页

作者： Jiaolong ZHANG Eva BINDER Hui WANG mehdi aminbaghai Bernhard LA PICHLER Yong YUAN Herbert A MANG College of Civil Engineering Tongji UniversityShanghai 200092China Department of Building Technology Linnaeus UniversityVaxjo 35195Sweden School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute for Mechanics of Materials and Structures TU WienVienna 1040Austria

This review of the added value of multi-scale modeling of concrete is based on three representative *** first one is concerned with the analysis of experimental data,taken from four high-dynamic *** structural nature of the high-dynamic strength increase can be explained by using a multi-scale *** accounts for the microstructure of 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 *** third example deals with multi-scale structural analysis of a real-scale test of a segmental tunnel *** 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 ***,it is concluded that multi-scale models have indeed a significant added ***,its degree varies with these *** 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.

关键词： experiments multi-scale analysis conventional structural analysis concrete reinforced concrete

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A Matrix-Vector Operation-Based Numerical Solution Method for Linear m-th Order Ordinary Differential Equations:Application to Engineering Problems

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Advances in Applied Mathematics and Mechanics 2013年第3期5卷 269-308页

作者： M.aminbaghai M.Dorn J.Eberhardsteiner B.Pichler Institute for Mechanics of Materials and Structures Vienna University of Technology(TU Wien)Karlsplatz 13/202A-1040 ViennaAustria Linnaeus University Department of Building and Energy TechnologyL¨uckligs Plats 1S-35195 V¨axj¨oSweden

Many problems in engineering sciences can be described by linear,inhomogeneous,m-th order ordinary differential equations(ODEs)with variable *** this wide class of problems,we here present a new,simple,flexible,and robust solution method,based on piecewise exact integration of local approximation polynomials as well as on averaging local *** method is designed for modern mathematical software providing efficient environments for numerical matrix-vector operation-based *** on cubic approximation polynomials,the presented method can be expected to perform(i)similar to the Runge-Kutta method,when applied to stiff initial value problems,and(ii)significantly better than the finite difference method,when applied to boundary value ***,we use the presented method for the analysis of engineering problems including the oscillation of a modulated torsional spring pendulum,steady-state heat transfer through a cooling web,and the structural analysis of a slender tower based on second-order beam *** convergence studies provide insight into the satisfying characteristics of the proposed solution scheme.

关键词： Numerical integration polynomial approximation ODE variable coefficients initial conditions boundary conditions stiff equation

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