Numerične analize padca velikega armirano betonskega zabojnika : magistrsko delo

Lavrenčič, Marko (author), Brank, Boštjan (mentor), Kramar, Miha (comentor)

V okviru priprav na gradnjo odlagališča nizko- in srednjeradioaktivnih odpadkov je bil zasnovan armirano betonski zabojnik, v katerem bodo shranjeni jedrski odpadki. Magistrsko delo obravnava analizo padca zabojnika na togo podlago. Izvedbo takega testa zahteva Zakon o prevozu nevarnega blaga, ki se sklicuje na evropski sporazum o mednarodnem cestnem prevozu nevarnega blaga (ADR). Za izvedbo analize smo uporabili računalniški program Abaqus/Explicit, ki enačbo dinamike konstrukcij rešuje z uporabo eksplicitne metode. V prvem delu dela so opisani numerični model, tip analize in uporabljeni materialni modeli. Preučili smo različne opise materialnega obnašanja betona, ki je zaradi razpokanja v nategu in plastifikacije v tlaku zelo kompleksen material. Uporabljen je konstitutivni model »Concrete damage plasticity«, ki je sposoben zajeti poškodovanost in plastifikacijo materiala in različno obnašanje v tlaku in nategu. Na preprostih primerih palice v tlaku in nategu in prostoležečega nosilca obremenjenega s tritočkovnim in štiritočkovnim upogibom, smo najprej preverili odziv materialnega modela pri preprostih obremenitvah. V drugem delu so za obravnavana scenarija padca zabojnika na vogal in zvrnitve zabojnika najprej predstavljeni rezultati analize obeh osnovnih modelov. V nadaljevanju so identificirani parametri modela, ki imajo vpliv na rezultat, nato pa je opravljena parametrična študija. Spremljali smo predvsem potek energijskih krivulj, na podlagi katerih smo ugotavljali kateri parametri imajo vpliv na rezultate. V zadnjem delu magistrskega dela smo identificirali pomembne parametre ter podali predloge za izboljšanje numeričnega modela.

• Language: Slovenian
• Keywords: numerična analiza, Abaqus, MKE, simulacija, zabojnik, jedrski odpadki, parametrična študija, »Concrete damage plasticity«
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: [M. Lavrenčič]
• Year: 2016
• PID: 20.500.12556/RUL-84881
• UDC: 519.63:624.07(043.3)
• COBISS.SI-ID: 7591777
• Publication date in RUL: 27.03.2019

LAVRENČIČ, Marko, 2016, Numerične analize padca velikega armirano betonskega zabojnika : magistrsko delo [online]. Master’s thesis. M. Lavrenčič. [Accessed 17 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=84881

Secondary language

• Language: English
• Title: Numerical analyses of impact of large reinforced concrete container : master thesis

Abstract

In the process of the construction of low- and intermediate-nuclear waste repository, a reinforced concrete container, in which the waste is going to be stored, was designed. In this thesis, the impact of the container with a rigid ground was analysed. Such a drop test is required by the Law on transportation of dangerous goods, which is referring to European Agreement Concerning the International Carriage of Dangerous Goods by Road (ADR). A finite element method code Abaqus/Explicit was used for analysis, solving the structural dynamic equation with an explicit method. In the first part, the numerical model, type of analysis and used material models are presented. Material model describing the behaviour of concrete was carefully selected, as concrete is one of the most complex materials, because of its anisotropic behaviour and nonhomogeneous composition. Concrete damage plasticity model, which is used, is capable of describing the damage in the material under load as well as the different behaviour in tension and compression. Simple tests on a rod and a three and four point bending beam were conducted to see material behaviour in such circumstances. In the second part, the results of analysis for both the model of impact on the corner and the tumble over one side of the container are first presented. A parametric study was conducted in which we changed the values of chosen parameters. Energy throughout the analysis is presented and based on the results the parameters that impact the results are identified. In the last part, influential parameters are recognised and some proposals on the improvement of the numerical model are given.

• Keywords: numerical analysis, Abaqus, FEM, simulation, container, nuclear waste, parametric study, Concrete damage plasticity