 |  Redni profesor dr. Kravanja Stojan, univ.dipl.ing.grad.
Kabinet J1-310
Telefon: +386 (0)2 2294 348
HABILITACIJA
Redni profesor za predmetni področji Jeklene konstrukcije in Računanje konstrukcij
PEDAGOŠKO DELO
Univerzitetni študijski program Gradbeništvo
Obvezni predmeti: Jeklene konstrukcije, Kovinske konstrukcije,
Nelinearna analiza konstrukcij
Izbirni predmeti: Izbrana poglavja iz jeklenih konstrukcij, Optimizacija konstrukcij
Univerzitetni študijski program Gospodarsko inženirstvo, smer Gradbeništvo
Obvezni predmeti: Jeklene konstrukcije
Univerzitetni študijski program Arhitektura
Obvezni predmeti: Statika I, Statika II, Jeklene konstrukcije
Visokostrokovni studijski program
Obvezni predmeti: Jeklene konstrukcije
Izbirni predmeti: Kovinske gradnje, Izbrana poglavja iz jeklenih konstrukcij
RAZISKOVALNO DELO
Znanstveno in strokovno obravnava tematike s področja gradbeništva, predvsem s podpodročja analize, optimiranja in sinteze jeklenih in sovprežnih konstrukcij:
Analiza konstrukcij
· Jeklene konstrukcije
· Sovprežne konstrukcije
Optimiranje konstrukcij
· Vrste konstrukcij
o večetažni jekleni okvirji
o jeklena paličja
o jeklene industrijske hale
o sovprežni stropni sistemi (sovprežni I nosilci, sovprežna paličja)
o konstrukcije hidromehanske opreme (zapornice, cevovodi)
· Optimizacijske metode
o zvezno optimiranje z nelinearnim programiranjem (NLP)
o diskretno/zvezno optimiranje z mešanim celoštevilskim nelinearnim programiranjem (MINLP)
o stroškovno optimiranje na podlagi definirane podrobne stroškovne namenske funkcije konstrukcije
Sinteza konstrukcij
· Sinteza in optimiranje realnih konstrukcij
o stroškov izdelave ali mase konstrukcije
o topologije (števila in razporeda konstrukcijskih elementov)
o diskretnih materialov (trdnosti betonov in jekel)
o standardnih dimenzij (jekleni profili, debeline pločevin, armaturno jeklo)
o zaokroženih dimenzij (vse nestandardne dimenzije so v izračunu zaokrožene na cele cm ali mm)
IZOBRAZBA
1981 - univ. dipl. inž. grad. Visoka tehniškna šola, Univerza v Mariboru
1985 - strokovni izpit Gospodarska zbornica Slovenije, Ljubljana
1991 - mag. tehn. znan. Tehniška fakulteta, Univerza v Mariboru
1996 - dr. tehn. znan. Fakulteta za gradbeništvo, Univerza v Mariboru
POLOŽAJ
1981-1984 statik Projekt Maribor
1984-1986 statik projektant Metalna Maribor
1986-1987 vodja projekta Artex, New York
1987-1989 statik projektant Metalna Maribor
1989-1996 mladi raziskovalec Tehniška fakulteta, Univerza v Mariboru
1996-2001 docent Fakulteta za gradbeništvo, Univerza v Mariboru
2001-2006 izredni profesor Fakulteta za gradbeništvo, Univerza v Mariboru
2006- redni profesor Fakulteta za gradbeništvo, Univerza v Mariboru
2007- prodekan Fakulteta za gradbeništvo, Univerza v Mariboru
POMEMBNI PROJEKTI
Znanstveno-raziskovalni projekti
Slovensko-francoski znanstveni projekt, PROTEUS št. 99019, Diskretno-zvezno optimiranje konstrukcij, vodja Stojan Kravanja (Slovenija) in Marc Sartor (Francija), MZT, 1998-2001
Sinteza inženirskih konstrukcij z optimizacijskimi metodami MINLP, vodja Stojan Kravanja, L2-0665 (B), MZT, 1998-2001
Raziskovalni program
Razvoj, modeliranje in optimiranje objektov in procesov v gradbeništvu in prometu, vodja Stojan Kravanja, P2-0129 (B), ARRS, 2004-2008, 2009-2011
Zaključno poročilo
Razvoj, modeliranje in optimiranje objektov in procesov v gradbeništvu in prometu, vodja Stojan Kravanja, P2-0129 (B), ARRS, 2009-2011
Prijava programa
Strokovni projekti (12 zanimivih referenc izvedenih objektov)
1. Kravanja, S., Hidroelektrarna HE Djale, Split, Hrvaška, hidromehanska oprema, turbinski vtok in iztok, talni izpust, analiza konstrukcij in design, Metalna Maribor, 1984-1987.
2. Kravanja, S., Baniea Hydel Plant, Gvineja, turbinski vtok in iztok, tablaste zapornice, analiza konstrukcij in design, Metalna Maribor, 1985.
3. Kravanja, S., Playas Hidroelectrico Projecto, Kolumbija, tunelska zapornica, analiza konstrukcije in design, hidravlična analiza, Metalna Maribor, 1986.
4. Kravanja, S., Kouris Dam Project, Ciper, tlačni cevovod, jeklena lupina in obloga, regulacijska zapornica, vtočne konusne lupine, obešene tirnice žerjavov, analiza konstrukcij in design, Metalna Maribor, 1986-1988.
5. Kravanja, S., Hidroelektrarna HE Višegrad, Bosna in Hercegovina, turbinski vtok, tablasta zapornica, analiza konstrukcije in design, Metalna Maribor, 1986-1987.
6. Kravanja, S., Hidroelektrarna HE Dubrava na Dravi, Hrvaška, hišna turbina, jeklene zapornice, portalni žerjav, analiza konstrukcij in design, Metalna Maribor, 1986-1987.
7. Kravanja, S., Hidroelektrarna HE Vrhovo, Slovenija, turbinski vtok in iztok, tablaste zapornice, analiza konstrukcij in design, Metalna Maribor, 1987-1988.
8. Kravanja, S., Blanda Hydel Plant, Islandija, vtok in talni izpust, tablaste zapornice, segimentne zapornice, dvižni mehanizem, dvižne rešetke, analiza konstrukcij in design, Metalna Maribor, 1985-1990.
9. Kravanja, S., Jekleni samostoječi dimnik, Graz, Avstrija, analiza konstrukcije, IMP in TF Maribor, 1992.
10. Kravanja, S., Sultartangi Hydroelectric Project, Islandija, tunelske vtočne zapornice, turbinski iztok, sinteza konstrukcij in optimiranje z MINLP, Metalna ECCE, 1997-2000.
Objekti svetovnih referenc (spadajo med največje konstrukcije tega tipa na svetu)
11. Kravanja, S., Bekhme Power Project, Irak, tunel, tablasta kotalna zapornica, analiza konstrukcije in design, Metalna Maribor,1987-1989.
To je ena od najbolj obremenjenih globinskih zapornic na svetu: višina vode na pragu 164 m. Hidrostatična sila 137205 kN (13720 ton) in potresna sila 155612 kN (15561 ton) delujeta na površino zapornice 6,2 m x 14,1 m (celotni projekt je bil ustavljen zaradi Zalivske vojne).
12. Kravanja, S., Bedenik, B., Križanič, M., Barrage de Bou Hanifia, Alžirija, preliv, zaklopne zapornice, analiza konstrukcij in design, Metalna in TF Maribor, 1989-1990.
Te zapornice spadajo med največje zaklopne zapornice na svetu. Na preliv so bile vgrajene tri zaklopne zapornice dimenzij po 25 m x 6,2 m. Največji vodni pretok znaša 5500 m3/s, višina vode 11 m in dvižna sila 5300 kN na vsak hidravlični cilinder.
POMEMBNE FUNKCIJE
Predstavnik fakultete v EUCEET III (European Civil Engineering Education and Training), SOCRATES program
Fellow of Wessex Institute of Great Britain
Predstavnik fakultete v Združenju kovinske industrije, Gospodarska zbornica Slovenije
Predsednik komisije Gradbeništvo, arhitektura, mestni projekt Mladi za napredek Maribora, Maribor
Prodekan za mednarodne zadeve, Fakulteta za gradbeništvo, Univerza v Mariboru
Vodja Katedre za metalne konstrukcije, Fakulteta za gradbeništvo, Univerza v Mariboru
RAZNO
Na Fakulteti za gradbeništvo in geodezijo Univerze v Ljubljani predava skupaj s kolegom prof. dr. Markom Keglom predmet Optimizacija konstrukcij.
Sodelovanje pri nacionalnih projektih.
OBJAVE
Izvirni znanstveni članki (12 reprezentativnih člankov iz mednarodnih revij)
1. Kravanja, S., Bedenik, B., Križanič, M., Flap gates at Bou Hanifa, Int. Water Power Dam Constr., 47/ 8 , pp. 30-32, 1995.
2. Kravanja, S., Kravanja, Z., Bedenik, B., The MINLP optimization approach to structural synthesis, Part I, A general view on simultaneous topology and parameter optimization, Int. J. Numer. Methods Eng., 43, no. 2, pp. 263-292, 1998.
3. Kravanja, S., Kravanja, Z., Bedenik, B., The MINLP optimization approach to structural synthesis, Part II, Simultaneous topology, parameter and standard dimension optimization by the use of the linked two-phase MINLP strategy, Int. J. Numer. Methods Eng., 43, no. 2, pp. 293-328, 1998.
4. Kravanja, S., Kravanja, Z., Bedenik, B., The MINLP optimization approach to structural synthesis, Part III, Synthesis of roller and sliding hydraulic steel gate structures, Int. J. Numer. Methods Eng., 43, no. 2, pp. 329-364, 1998.
5. Kravanja, S., Optimization of the Sultartangi sliding gates in Iceland, The International Journal on Hydropower & Dams, vol. 9, iss. 2, pp. 42-45, 2002.
6. Kravanja, S., Šilih, S., Optimization based comparison between composite I beams and composite trusses, J. Constr. Steel Res., 59/ 5, pp. 609-625, 2003.
7. Kravanja, S., Soršak, A., Kravanja, Z., Efficient multilevel MINLP strategies for solving large combinatorial problems in engineering, Optimization and engineering, vol. 4, no. 1/2, pp. 97-151, 2003.
8. Šilih, S., Premrov, M., Kravanja, S., Optimum design of plane timber trusses considering joint flexibility, Engineering Structures, vol 27 /1, pp. 145-154, 2005.
9. Kravanja, S., Šilih, S., Kravanja, Z., The multilevel MINLP optimization approach to structural synthesis: the simultaneous topology, material, standard and rounded dimension optimization. Adv. eng. softw. (1992), vol. 36, iss. 9, pp. 568-583, 2005.
10. Klanšek, U., Kravanja, S., Cost estimation, optimization and competitiveness of different composite floor systems. Part 1, Self-manufacturing cost estimation of composite and steel structures. J. Constr. steel res., vol. 62, iss. 5, pp. 434-448, 2006
11. Klanšek, U., Kravanja, S., Cost estimation, optimization and competitiveness of different composite floor systems. Part 2, Optimization based competitiveness between the composite I beams, channel-section and hollow-section trusses. J. Constr. steel res., vol. 62, iss. 5, pp. 449-462, 2006.
12. Rep, K., Kompare, B., Roš, M., Kravanja, S., Cost optimization of integrated wastewater drainage and treatment systems. Water environ. res., vol. 80, no. 7, pp. 581-595, 2008.
Znanstvena monografija
Kravanja, S., Sinteza konstrukcij z mešanim celoštevilskim nelinearnim programiranjem, Fakulteta za gradbeništvo, Univerza v Mariboru, 2006.
ŽIVLJENJEPIS
Dr. Stojan Kravanja is professor and researcher at the Faculty of Civil Engineering, University of Maribor, Slovenia. He started his career twenty-five years ago when he obtained his diploma at the High Technical School, Maribor (1981). Stojan Kravanja was then employed as a structural engineer in the firm Projekt Maribor (1981-1984). There he mainly performed structural analyses for industrial buildings, houses, shops and sport buildings.
Dr. Kravanja gained perfect knowledge in the field of steel structures a couple of years later in the firm Metalna in Maribor, where he was employed as a structural engineer for hydropower equipment and dams, gates, penstocks, cranes and other steel buildings (1984-1989). In this period he calculated and designed various steel structures for several projects throughout the world, such as: hydro-mechanical equipment for the Hydropower Plant HE Djale, Split, Croatia, (1984-1987), turbine intake and outlet for the Baniea Hydel Plant, Guineia (1985), tunnel closure gates for Playas Hidroelectrico Projecto, Columbia (1986), steel pipe, linings, conical shells and gates for the Intakes Kouris Dam Project, Cyprus (1986-1988), turbine intake for the Hydropower Plant HE Višegrad, Bosnia and Herzegovina (1986-1987), gates and portal crane for the Hydropower Plant HE Dubrava on Drava river, Croatia, House Turbine (1986-1987), turbine intake and outlet for the Hydropower Plant HE Vrhovo, Slovenia (1987-1988), intake and bottom outlet for the Blanda Hydel Plant, Iceland (1985-1990), etc.
Stojan Kravanja also calculated and designed two structures recognised as world references. The first one is the roller hydraulic steel gate Closure Gate, Bekhme Dam Project, Iraq (1987-1989), loaded with one of the highest loads in the world: 164 m of water head and 155610 kN (15561 tons) of hydrostatic force. The second structure is one of the largest flap gates in the world: Barrage de Bou Hanifia in Algeria (1989-1990). The dam comprises three large flap gates 25 x 6.5 m in size. The greatest spilling of the water is 5500 m3/s and the load force acting on the hydraulic cylinder amounts to 5300 kN.
Stojan Kravanja was employed as a junior researcher at the Faculty of Technical Sciences, University of Maribor (1989-1996). He completed his MS studies in 1991 and obtained his PhD in 1996 at the Faculty of Civil Engineering, University of Maribor, where he was employed as Assistant Professor and later as Associate Professor. Dr. Stojan Kravanja became Full Professor in 2006. He holds lectures on Steel structures, Steel buildings, Selected topics on steel structures and Structural optimization at the undergraduate and graduate levels of study. He also teaches the subject Structural optimization at the Faculty of Civil Engineering and Geodesy, University of Ljubljana.
In the field of the research, Dr. Stojan Kravanja has specialized in steel structures, structural analysis and optimization. He performs continuous Non-linear Programming (NLP) as well as discrete-continuous Mixed-Integer Non-linear Programming (MINLP) optimisations of structures in civil engineering. The MINLP is a combined continuous-discrete optimization technique. It enables the optimization of a structural mass (or manufacturing costs), where a structural topology, discrete materials, standard sizes and rounded dimensions are obtained simultaneously. In this way, an optimal number and the configuration of structural elements, steel and concrete grades, standard steel sections, sheet-iron plate thickness and steel for the reinforcement are obtained; all the continuous dimensions are in the process of the optimization rounded automatically to the optimal discrete values in millimetres or centimetres.
Professor Dr. Stojan Kravanja is the vice-dean for international cooperation of the Faculty of Civil Engineering and head of the Centre for metal constructions. Dr. Stojan Kravanja is also head of the research program “Development, modelling and optimization of structures and processes in civil engineering and traffic”, financed by the Slovenian Research Agency. In recognition of his outstanding work, Dr. Stojan Kravanja was admitted as a Fellow of the Wessex Institute of Great Britain.
| |