Computational mechanics of materials and structures

Mang, Herbert A.; Eberhardsteiner, Josef; Hellmich, Christian; Hofstetter, Karin; Jäger, Andreas; Lackner, Roman; Meinhard, Klaus; Müllner, Herbert W.; Pichler, Bernhard; Pichler, Christian; Reihsner, R.; Stürzenbecher, Reinhard; Zeiml, Matthias

doi:10.1016/j.engstruct.2009.01.005

Cited by 9 publications

(7 citation statements)

References 60 publications

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“…(Gribniak et al 2007(Gribniak et al , 2008Kaklauskas et al 2009). Unfamiliarity of the behaviour of new materials and structures under real conditions can be gradually eliminated based on theoretical analysis of verified experimental research and modern methods of computational mechanics (Mang 2009;Mang et al 2009). Obtained results may be utilized in standards for design.…”

Section: Resultsmentioning

confidence: 99%

Stability Problems of Steel‐concrete Members Composed of High‐strength Materials

Kala

Puklický

Omishore

et al. 2010

Journal of Civil Engineering and Management

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Abstract. The presented paper deals with the stochastic analysis of the ultimate limit states of steel-concrete building members. The load carrying capacity of steel-concrete columns, comprising of steel profiles encased in high strength concrete, in compression is analyzed. The first part of the paper lists assumptions for the determination of the theoretical load carrying capacity of the column. Principles of elasticity and plasticity are used to determine stresses in the concrete and steel sections. Statistical characteristics of input material and geometrical imperfections are listed. Results of the theoretical analysis are then compared with results of experimental research. Statistical characteristics of obtained results of the theoretical analysis were verified using statistical characteristics obtained from experimental research. Numerical simulation LHS and Monte Carlo methods, which take into account the influences of variability of input imperfections, were employed. The influence of the utilization of the plastic reserve in the determination of the load carrying capacity of the analysed strut is shown. The influence of the initial geometric imperfections of initial strut curvature on the load carrying capacity is also presented.

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Section: Resultsmentioning

confidence: 99%

Stability Problems of Steel‐concrete Members Composed of High‐strength Materials

Kala

Puklický

Omishore

et al. 2010

Journal of Civil Engineering and Management

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“…The sensitivity analysis provides the steel manufacturers with valuable information on the necessity of the imperfections to be controlled, during the manufacturing process, with increased attentiveness and accurateness. The studies published here link up with the long-term theoretical and experimental research the results of which were published in [44][45][46][47][48][49][50][51][52][53].…”

Section: Sensitivity Analysis Resultsmentioning

confidence: 99%

Sensitivity Analysis of Stability Problems of Steel Structures using Shell Finite Elements and Nonlinear Computation Methods

Kala¹,

Kala²

2011

AIP Conference Proceedings

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The paper analyzes the influence of initial imperfections on the ultimate limit state of a slender strut, applying the ANSYS programme. The geometrical and material nonlinear finite element method was applied for the theoretical analysis. Modelling of the steel structure was performed using SHELL elements. The effect of input imperfections on the load-carrying capacity is evaluated by sensitivity analysis. This paper is devoted to a class of sensitivity analysis techniques that are known as the variance-based methods. Input imperfections are of random origin. The Sobol's sensitivity analysis was used to determine the sensitivity of load-carrying capacity of a strut with respect to the variance of initial imperfections. The sensitivity analysis results identify the imperfections the variability of which can influence the structure reliability. The Latin Hypercube Sampling method was applied for the evaluation of sensitivity indices. The computation model elaborated is unique with regard to its numerically demanding character.

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“…Macroscopic variables are defined typically as averages of microscopic variables over a REV. Literature is jamming of many recent treatises used the above argument [1][2][3][4][5][6], however, the difficulties associated with the measurement and the characterization of granular microstructure had prevented the identification of the size of REV in real media. In the absence of experimental measurements, the minimum dimensions of the REV are set by the grain size with the best guess being the REV is between 100 to 1000 grain diameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of representative elementary volume of sands using X-ray computed tomography

Hattamleh¹,

Razavi²,

Muhunthan³

2009

Computational Methods and Experiments in Materials Characterisation IV

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The concept of a representative elementary volume (REV) provides an effective means of developing macroscopic measures in the description of granular materials. However, due to the difficulties associated with the measurement and characterization of granular microstructure the existence and size of an REV has remained largely conjectural. This study presents a systematic method to examine the characteristics of the REV using X-ray computed tomography images. The 3-D images of Silica sand, and Ottawa sand have been characterized using advanced image processing techniques. The porosity variation of Silica sand and Ottawa sand showed three characteristic regions: an initial fluctuation region due to microscopic variations, a constant plateau region, and a region with a monotonic increase/decrease due to heterogeneity. The results show that for Silica sand composed mainly of elongated particles the REV is between 5 to 11 times of D50 and for Ottawa sand composed mainly of subrounded particles is between 9 to 16 times of D50.

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Computational mechanics of materials and structures

Cited by 9 publications

References 60 publications

Stability Problems of Steel‐concrete Members Composed of High‐strength Materials

Stability Problems of Steel‐concrete Members Composed of High‐strength Materials

Sensitivity Analysis of Stability Problems of Steel Structures using Shell Finite Elements and Nonlinear Computation Methods

Experimental determination of representative elementary volume of sands using X-ray computed tomography

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