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Efficient Tools for Managing Uncertainties in Design and Operation of Engineering Structures
Authors: J. Menčík
Abstract:Actual load, material characteristics and other quantities often differ from the design values. This can cause worse function, shorter life or failure of a civil engineering structure, a machine, vehicle or another appliance. The paper shows main causes of the uncertainties and deviations and presents a systematic approach and efficient tools for their elimination or mitigation of consequences. Emphasis is put on the design stage, which is most important for reliability ensuring. Principles of robust design and important tools are explained, including FMEA, sensitivity analysis and probabilistic simulation methods. The lifetime prediction of long-life objects can be improved by long-term monitoring of the load response and damage accumulation in operation. The condition evaluation of engineering structures, such as bridges, is often based on visual inspection and verbal description. Here, methods based on fuzzy logic can reduce the subjective influences.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1327630Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1437
 IEC 61025. Fault Tree Analysis. 2006.
 IEC 60812. Analysis techniques for system reliability - Procedure for failure mode and effects analysis (FMEA). 2006.
 G. Taguchi, Taguchi on Robust Technology Development. ASME Press, New York, 1993.
 W. Y. Fowlkes, and C. M. Creveling, Engineering methods for robust product design. (Using Taguchi methods in technology and product development.) Addison-Wesley, New York, 1995.
 D. Nov├ík, B. Tepl├¢, and N. Shiraishi, Sensitivity Analysis of Structures: A Review. Proc. Int. Conf. CIVIL COMP'93, August 1993, Edinburgh, Scotland, pp. 201-207.
 J. Men─ì├¡k, Reliability-based parameter optimization and tolerancing in structural design. In: Structural Safety and Reliability (ICOSSAR '01, Newport Beach). Editors: R.B. Corotis, G.I. Schu├½ller, and M. Shinozuka. A.Balkema Publishers, Lisse, 2001. Abstract: p.188, full text CD-ROM.
 P. Marek, M. Gu┼ítar, and T. Anagnos, Simulation-Based Reliability Assessment for Structural Engineers, CRC Press, Inc., Boca Raton, Florida, 1995.
 P. Marek and M. Gu┼ítar, Ant-Hill and M-Star programs for Monte Carlo simulations, Prague, 1995 - 2006. www.noise.cz/sbra .
 D. Nov├ík et al., FREET - Feasible Reliability Engineering Efficient Tool, Program documentation. Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics/─îervenka Consulting, Prague, 2002 - 2009. www.freet.cz .
 VaP - Variable Processor, software. Petschacher Consulting, Feldkirchen, Austria, 2003.
 R. L. Iman and W. J. Conover, "Small sample sensitivity analysis technique for computer models, with an application to risk assessment." Communications in Statistics A9-(17), pp. 1749- 1874, 1980.
 A. Florian, Modern numerical simulation methods - an overview. Stavebn├¡ obzor 7, 1998, No. 2, pp. 60-64.
 A. H. S. Ang and W. H. Tang, Probabilistic concepts in engineering planning and design. John Wiley & Sons, New York, 1975.
 ISO 12491. Statistical methods for quality control of building materials and components. 1997.
 J. Men─ì├¡k, The use of Bayesian methods for quality and reliability assessment in civil engineering. Proc. III. Int. Sci. Conf. Quality and Reliability in Building Industry. Levo─ìa, October 22-24, 2003. Technical University of Ko┼íice, 2003, pp. 379 - 384.
 L. Beran, Reliability and load carrying capacity of existing steel railway bridge structures. PhD thesis. University of Pardubice, Pardubice, 2004.
 B. Culek, Jr. and B. Culek, Probabilistic assessment of the lifetime of the railway steel bridge across river Labe. 24th Danubia-Adria Symposium on Developments in Experimental Mechanics. Sibiu, 19-22 September 2007. University Lucian Blaga, Sibiu, 2007, pp. 59 - 60.
 J. Men─ì├¡k, H. ┼áertler, L. Beran, and B. Culek, jr., Methods for improved assessment of load-carrying kapacity and fatigue life of existing steel bridges In: G. Augusti, G. I. Schueller, and M. Ciampoli (editors): Safety and Reliability of Engineering Structures and Systems (ICOSSAR 2005), Rome. Millpress, Rotterdam, 2005, p. 126 + CD ROM.
 Fuzzy Logic Toolbox User's Guide. The MathWorks, Inc., 2008. http://www.mathworks.com/access/helpdesk/help/pdf_doc/fuzzy/fuzzy.p df
 Z. Kala, Fuzzy-random analysis of steel structures. Engineering Mechanics, 14, 2007, No. 1, pp. 1-12.
 B. Möller and M. Beer, Fuzzy randomness: uncertainty in civil engineering and computational mechanics. Springer Verlag, Berlin - Heidelberg, 2004.
 P. Rudolf, Reliability and service life of existing bridges and their assessment using modern computational tools. PhD thesis, University of Pardubice, Pardubice, 2009.