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Projects / Programmes source: ARIS

Mehanika konstrukcij (Slovene)

Periods
Research activity

Code Science Field Subfield
2.05.00  Engineering sciences and technologies  Mechanics   
2.01.00  Engineering sciences and technologies  Civil engineering   

Code Science Field
T220  Technological sciences  Civil engineering, hydraulic engineering, offshore technology, soil mechanics 
T210  Technological sciences  Mechanical engineering, hydraulics, vacuum technology, vibration and acoustic engineering 
Evaluation (rules)
source: COBISS
Researchers (20)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  20157  PhD Bojan Čas  Civil engineering  Researcher  2004 - 2008  152 
2.  08432  PhD Igor Dobovšek  Mechanics  Researcher  2004 - 2008  103 
3.  16142  PhD Rado Flajs  Civil engineering  Researcher  2004 - 2008  62 
4.  24339  PhD Matija Gams  Civil engineering  Junior researcher  2005 - 2008  204 
5.  00959  PhD Mladen Houška  Mechanics  Researcher  2005 - 2008  76 
6.  25423  PhD Tomaž Hozjan  Civil engineering  Junior researcher  2005 - 2008  301 
7.  10424  PhD Pino Koc  Mechanics  Researcher  2005 - 2008  258 
8.  25422  Nana Krauberger  Civil engineering  Junior researcher  2005 - 2008  18 
9.  29320  PhD Aleš Kroflič  Civil engineering  Junior researcher  2008  30 
10.  28340  Mojca Markovič  Civil engineering  Junior researcher  2007 - 2008  14 
11.  05069  PhD George Mejak  Mechanics  Researcher  2004 - 2008  106 
12.  14507  PhD Igor Planinc  Civil engineering  Researcher  2004 - 2008  379 
13.  28380  PhD Urban Rodman  Civil engineering  Junior researcher  2007 - 2008  23 
14.  02189  PhD Miran Saje  Civil engineering  Head  2004 - 2008  484 
15.  23474  PhD Simon Schnabl  Civil engineering  Researcher  2004 - 2008  295 
16.  09217  PhD Stanislav Srpčič  Civil engineering  Researcher  2004 - 2008  178 
17.  27666  PhD Gregor Trtnik  Civil engineering  Junior researcher in economics  2006 - 2008  117 
18.  08437  PhD Goran Turk  Civil engineering  Researcher  2004 - 2008  524 
19.  19121  PhD Dejan Zupan  Civil engineering  Researcher  2004 - 2008  240 
20.  27673  PhD Eva Zupan  Mechanics  Junior researcher in economics  2006 - 2008  56 
Organisations (2)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0101  Institute of Mathematics, Physics and Mechanics  Ljubljana  5055598000  19,652 
2.  0792  University of Ljubljana, Faculty of Civil and Geodetic Engineering  Ljubljana  1626981  26,381 
Significance for science
The research group was successful in publishing its results in high-quality peer-reviewed international journals and in disseminating knowledge on national and international conferences. We wish to point out here those works that seem to us to undoubtedly contribute to the "development of science". ---Tools for numerical non-linear static and dynamic analysis of space structures. We have proposed a family of accurate, reliable and robust, and computationally efficient spatial beam finite elements, based on the interpolation of strain vectors. The improvement of the present-state beam finite elements has been made possible by introducing and implementating several new ideas, including: the point-wise satisfaction of consistency conditions; inconventional interpolation functions; quaternions; new energy-conserving time-integration scheme; the way the non-linear constitutive equations are solved to improve the global convergence. A parallel work has been focused on the development of a composite planar beam element, where slip at the contact between the beams takes place. They provide tools for a reliable analysis of behaviour of engineering structures, as shortly described in the sequel. ---Behaviour of structures in fire. It is essential to be able to predict behaviour of engineering structures in fire without doing experiments. Our numerical tools described above have been modified to include time-dependent temperature loading and realistic material laws that are capable of behaviour of material during high temperature. A systematic analyses have been performed to assess the effect of a number of parameters on simple structures. ---Composite structures. Here our objective is to assess the effect of slip between the layers of equal or different materials, with the connections being either perfectly or imperfectly glued, welded, nailed or screwed, on ductility and the bearing capacity of the composite structure. Although being small, slip may largely affect ductility. As composite timber structures are prone to delamination, their effect onto the critical load and post-buckling behavior should not be neglected. The delamination often triggers the buckling failure at a considerably reduced force. It is thus very important to study different types of single and multiple delaminations regarding their effects on both buckling and post-buckling behavior. ---Material properties and behaviour in hardening concrete. Here our concern are adiabatic temperature curves due to hydration of cement, the setting time in a cement paste and the variation of strength of concrete with time. We managed to develop a neural networks-based computational algorithm that is capable of predicting adiabatic curves for a rather general concrete mix. The setting time and the increase of strength during initial phase of hardening of concrete depend on various parameters including temperature of concrete. A simple, ultrasonic-based non-destructive procedure to obtain the setting time of cement paste has been developed and validated. The third method combines ultrasonic experiments and artificial neural networks to predict current concrete strength. These new methods are simple to use and are thus not only a scientific achievement. ---Timber strength grading. Simulation methods such as Monte Carlo method must be applied to analyze the accuracy and reliability of strength timber grading. There are several steps that are of a significant scientific value: the generation of sample of non-normally distributed correlated random variables; characteristic value determination in the case of small samples; and the automatization of the grading procedure and determination of optimal goal function for the optimum grading and machine setting determination.
Significance for the country
The period 2004-2008 appears to be successful for the Structural mechanics group particularly in terms of its scientific production. This proves its high scientific level comparable to the level in good international universities. This is of a prime importance for our faculty, students and slovenian universities in keeping pace with the international academic community. The research group follows its own theoretical concepts and combines them with the ideas found in recent literature. The primary aim of the group is the production of its own mathematical models and research computer programs, although commercial computer programs are not fully ignored. Hence it operates as an independent research unit with a profound knowledge of both theory and computational techniques. This is an advantage in solving non-standard professional and scientific problems. The characteristic problems of this kind, also important for Slovenia, are fire safety of structures (e.g. of tunnels), timber strength grading (sawmills), and behaviour of fresh hardening concrete (with regard to the optimal technology of construction of large buildings, e.g. hydro power plants on the river Sava).
Most important scientific results Final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Final report, complete report on dLib.si
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