Design and static analysis of arch dam using software SAP2000 : master thesis

Ghafoori, Yaser (author), Kryžanowski, Andrej (mentor), Zupan, Dejan (co-mentor)

Predmet obdelave v magistrski nalogi je izdelava statične analize ločne pregrade. V analizi smo izbrali hipotetični primer ločne pregrade, ki smo jo zasnovali po priporočilih za načrtovanje ločnih pregrad, ki so v uporabi v Združenih državah Amerike. V prvem delu naloge so podane osnovne definicije in pojmi v povezavi z ločnimi pregradami. Sledi splošni opis osnovnih izhodišč in kriterijev za načrtovanje ločnih pregrad in izdelavo statično-stabilitetne analize. V drugem delu naloge je prikazan opis zasnove ločne pregrade na hipotetični lokaciji, ki po vseh projektnih parametrih ustreza postavitvi ločne pregrade. Sledi prikaz izdelave izhodiščnega modela v grafičnih okoljih AutoCad in SketchUp. Statična analiza je izdelana v programskem okolju SAP2000, ki temelji na metodi končnih elementov. Za analizo so bili uporabljeni že vgrajeni tridimenzionalni končni elementi. Materialni parametri so bili določeni na podlagi izbranih priporočenih vrednostih iz literature, ker z dejanskimi vrednostim nismo razpolagali. V sklopu statične analize smo obravnavali obtežni primer glavne obtežbe, ki jo predstavlja lastna teža pregrade in hidrostatični tlak zaradi akumulirane vode. V računu je upoštevanih več obtežnih kombinacij osnovnih dveh obtežb z največjo frekvenco pojavljanja v obdobju eksploatacije pregrade. V nalogi je obravnavan tudi primer vpliva osončenja na zračno lice pregrade - zgolj s predstavitvijo osnovnih podatkov o tipičnih porazdelitvah temperatur in temperaturnih spremembah v telesu pregrade. V računskem modelu smo upoštevali dva načina kontakta konstrukcije pregrade s temeljno podlago. Prvi način predvideva podprtje pregrade s togimi podporami, v drugem načinu pa je predpostavljeno, da je pregrada vpeta v elastično podlago, ki je v modelu opisana s ploskovno porazdeljenimi elastičnimi vzmetmi. Togost vzmeti je določena glede na privzete materialne lastnosti osnovne podlage. Rezultat statične analize so grafični prikazi pomikov in porazdelitve napetosti po telesu pregrade za izbrane obtežne primere in načina izvedbe kontakta pregrade s temeljno podlago.

• Language: English
• Keywords: civil engineering, master of science thesis, arch dam, static analysis, stress, deformation
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [Y. Ghafoori]
• Year: 2016
• Number of pages: X, 62 str.
• PID: 20.500.12556/RUL-85743
• UDC: 627.8.01(043.3)
• COBISS.SI-ID: 7613793
• Publication date in RUL: 27.09.2016

Secondary language

• Language: Slovenian
• Title: Zasnova in statična analiza ločne pregrade z uporabo programskega orodja SAP2000

Abstract

This thesis presents the layout and the analysis of an arch dam. The dam was layout and designed at an optional location. We followed two US manuals for design of arch dams and designed our dam accordingly. These two manuals are published by United States Army Corps of Engineer (USACE) and Interior Department of United States Bureau of Reclamation (USBR). The thesis starts with some basic information about arch dams. A review of references which are used in thesis is provided in chapter two. The static analysis of arch dam and the description of the selection procedures are presented with a brief description about finite element method (FEM) and its application. Layout and initial modeling of the dam were done by two graphical software; AutoCad and SketchUp. Analysis of the dam is based on FEM as implemented in SAP2000 software. 3D solid elements are used to model the dam. The material properties are defined based on typical values which are chosen on the recommendations found in literature. Two load cases were studied; hydrostatic pressure and concrete self-weight and various load combinations were applied to the structure. Some basic description about the temperature distribution and temperature load are also discussed, but they are not included into the finite element method. Special attention is dedicated to modeling of boundary conditions. In the first case the foundation is assumed to be rigid and in the second case elastic springs are used to model the foundation and part of dam body which is under abutment rocks. The stiffness of spring is defined on the bases of typical properties of foundation rocks. The results of analysis are presented by diagrams of displacements and stresses. We show, compare and discuss the response of both models under various load combinations.

• Keywords: gradbeništvo, magistrska dela, ločne pregrade, statična analiza, deformacija