Dimenzioniranje nosilne konstrukcije prednapetega betonskega mostu čez reko Sotlo : magistrsko delo

Šušteršič, Matic (author), Lopatič, Jože (mentor)

Magistrsko delo obsega konstrukcijsko zasnovo in projektiranje cestnega mostu čez reko Sotlo v kraju Bistrica ob Sotli. Most predstavlja regionalno povezavo med krajema Bistrica ob Sotli in Kumrovec ter je hkrati mejni most med državama Slovenijo in Hrvaško. Za osnovo pri projektiranju je bila uporabljena Idejna zasnova nadomestne gradnje mostu čez Sotlo (Igor Potočan, 2017), ki je bila izdelana z namenom preučitve možnih variant premostitve reke Sotle. Pregledali smo obstoječo projektno dokumentacijo, jo analizirali in izbrali najbolj ustrezen tip mostu, pri tem pa smo upoštevali številne parametre, kot so trasa ceste, topografija terena, geološka sestava tal in regulacija reke Sotle. Izbrana konstrukcijska zasnova je prednapet armiranobetonski most z enim poljem dolžine 36,7 m in krajnima opornikoma, ki se pod naklonom spuščata po brežinah reke Sotle do trdne podlage. Definirali smo materiale, iz katerih bo grajena nosilna konstrukcija mostu in analizirali vse vplive na konstrukcijo. Na podlagi geometrije mostu smo s programom Sofistik naredili ustrezen računski model in statično analizo konstrukcije. Obravnavali smo mejno stanje nosilnosti (stalno in potresno projektno stanje), kot tudi mejno stanje uporabnosti konstrukcije. Določili smo potrebno število kablov za prednapetje, izračunali potrebno silo prednapetja ter ovrednotili reološke vplive tako v prednapetih kablih kot v betonu. Po izračunu notranjih statičnih količin v konstrukciji smo določili še potrebno količino mehke armature v kritičnih območjih konstrukcije. V mejnem stanju uporabnosti smo preverili napetosti v betonu, v prednapetih kablih in v mehki armaturi.

• Language: Slovenian
• Keywords: zasnova mostu, prednapet betonski most, analiza obtežb, armiran beton, dimenzioniranje
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: [M. Šušteršič]
• Year: 2019
• PID: 20.500.12556/RUL-108540
• UDC: 624.21.03:656.11(497.4)(043.3)
• COBISS.SI-ID: 8855393
• Publication date in RUL: 06.07.2019

ŠUŠTERŠIČ, Matic, 2019, Dimenzioniranje nosilne konstrukcije prednapetega betonskega mostu čez reko Sotlo : magistrsko delo [online]. Master’s thesis. M. Šušteršič. [Accessed 1 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=108540

Secondary language

• Language: English
• Title: Design of prestressed concrete bridge structure over the Sotla river : master thesis

Abstract

The master thesis consists of conceptual design, analysis and final design of a road bridge over the Sotla river in municipality Bistrica ob Sotli. The bridge forms regional connection between town of Bistrica ob Sotli and Kumrovec and it also serves as a border bridge between country of Slovenia and Croatia. For the basis and help at the design process, the Conceptual design of replacement bridge over Sotla river (Potočan 2017) was used. In this conceptual design, the possible solutions of crossing the river were studied. We examined the existing project documentation; we evaluated it and selected the most suitable bridge type. Within this process we have taken into account numerous parameters such as geometric road design, topography od terrain, geological composition of the soil and last but not least, regulation of Sotla river. The best design option was post-tensioned concrete bridge with only one span and length of 36,7 m. The abutments on each side of the bridge are descending under inclination corresponding to riverbank and they reach solid bedrock at the river bottom. We defined appropriate materials of which the load-bearing structure is made of and we analysed all the possible actions acting on the bridge in its lifetime. We made suitable calculation model based on bridge geometry and we carried out static analysis of the load-bearing structure. We discussed ultimate limit state (permanent and seismic actions) as well as serviceability limit state and we calculated corresponding element forces. We determined the required number of prestressing cables; we calculated necessary prestressing force and evaluated all instant and time dependent losses of prestress. After calculating all inner forces of abutment and superstructure, the required quantity of reinforcement in the critical cross sections of the structure were determined. We also checked that the stresses of the concrete and cables are within allowed limits according to serviceability limit states.

• Keywords: bridge design, prestressed concrete bridge, load analysis, reinforced concrete, reinforcement check