Analiza metod za dimenzioniranje obročastih ojačitev jeklenih konstrukcij : diplomska naloga

Beltram, Matjaž (author), Sinur, Franc (mentor)

Diplomska naloga obravnava stabilnost jeklenih rezervoarjev. Ker imajo jekleni rezervoarji zelo veliko razmerje med radijem in debelino stene, je potrebno poseben poudarek nameniti kontroli stabilnosti. Ta je najbolj kritična v primeru praznega rezervoarja in delovanja vetrne obteţbe. Da povečamo uklonsko odpornost rezervoarja, mu lahko dodamo obročne ojačitve. Predstavili in med seboj primerjali smo standarde in priporočila za kontrolo stabilnosti rezervoarjev (API650 in EN14015, ter Evropska priporočila ECCS 5th Edition). Primerjavo smo izvedli na dejanskem rezervoarju v začetnem in trenutnem stanju, kjer se je debelina zaradi korozije občutno zmanjšala. Opravljene so bile tudi numerične LBA, GMNA in GMNIA analize za potrebe kontrole standardov. Z GMNIA analizo smo preverili odpornost rezervoarja, GMNA analiza pa nam je sluţila kot kontrola zajema začetnih nepopolnosti v GMNIA analizi. Te smo določili s pomočjo LBA analize, s katero smo poiskali tudi optimalna mesta ojačitev in jih primerjali z mesti dobljenimi po standardih. Glavna ideja diplomske naloge je bila izdelava računalniškega programa, ki bi poenostavil in skrajšal kontrolo stabilnosti rezervoarjev. V ta nam smo izdelali program »BuckleTank«, ki omogoča tako projektiranje novega kot kontrolo obstoječega rezervoarja po zgoraj naštetih standardih. Dodatno omogoča tudi generiranje vhodnih podatkov in zagon numerične analize v programu SIMULIA Abaqus FEA.

• Language: Slovenian
• Keywords: gradbeništvo, diplomska naloga, UNI, jeklene konstrukcije, standardi, stabilnost
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Beltram]
• Year: 2014
• Number of pages: XIV, 166 str.
• PID: 20.500.12556/RUL-32500
• UDC: 624.014.2(043.2)
• COBISS.SI-ID: 6834529
• Publication date in RUL: 10.07.2015

Secondary language

• Language: English
• Title: Methods for stability design of ring stiffened steel tanks

Abstract

The diploma thesis deals with design of steel tanks. Since the steel tanks are very slender (high ratio between the radius and plate thickness), special attention should be given to stability check. The most critical load situation to stability loss is when the wind load acts on the empty tank. To increase the buckling resistance of the steel tank the ring stiffeners are applied. Within the framework of the thesis the international design specification for buckling design of ring stiffened steel tanks (API650 and EN 14015 Standard and European recommendations ECCS 5th Edition) are given and compered. The design recommendations were used and compered on the already-built tank, for the built and current state, where the plates thicknesses were reduced due to steel corrosion. Additionally the LBA, GMNA and GMNIA numerical analysis of the tank were performed and compared to the results obtained by the design specifications. The GMINA analysis was used to compare numerically obtained resistance to design specifications, while the LBA analysis was used to find the optimal position of the ring stiffener and to reproduce initial imperfection shape for GMNIA analysis. One of the main ideas of the diploma thesis was to build a computer program that would perform stability design of ring stiffened tanks. To this end the program “BuckleTank”, which allows for buckling design of new as well as existing tanks in accordance to above mentioned design specifications was build. In addition the program also allows the generation and execution of python file which performs required analysis (FEA, GMNA, GMNIA) in program SIMULIA Abaqus FEA.

• Keywords: graduation thesis, civil engineering, steel structures, steel tanks, codes, recommendations