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Vpliv lastnosti temeljnih tal in togosti temeljne plošče na statični izračun objekta
Klinc, Blaž (Author), Pulko, Boštjan (Mentor) More about this mentor... This link opens in a new window, Bratina, Sebastjan (Co-mentor)

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Abstract
V diplomski nalogi smo obravnavali interakcijo konstrukcije in temeljnih tal. Na podlagi standardov Evrokod smo določili dimenzije konstrukcije in velikost ter kombinacijo obtežb. Naredili smo več računskih analiz, pri tem pa spreminjali debelino temeljne plošče, lastnosti temeljnih tal in idealiziran računski model temeljnih tal. Obravnavali smo konstrukcijo s 25, 40, 55, 70 in 100 cm debelo temeljno ploščo. Analizirali smo dve vrsti temeljnih tal in sicer boljša temeljna tla, ki smo jim predpostavili povprečni posedek 1 cm, in slabša temeljna tla, ki se pod povprečno obtežbo posedejo za 10 cm. V računski analizi smo temeljna tla modelirali s tremi različnimi idealiziranimi modeli temeljnih tal. Prva dva modela sta enostavnejša in ju uvršamo med dvodimenzionalne enoparametrske mehanske modele. To sta Winklerjev model temeljnih tal s konstantnim koeficientom reakcije tal in psevdo-povezan koncept. Tretji uporabljen model temeljnih tal je tridimenzionalen in natančneje opiše napetostno in deformacijsko stanje v temeljnih tleh. Računske analize smo izvedli s programoma SAP2000 in Plaxis 3D, ki temeljita na metodi končnih elementov. Na podlagi primerjave rezultatov opravljenih računskih analiz smo poskušali ugotoviti podobnosti in razlike v razporeditvi posedkov in notranjih statičnih količin v konstrukciji, ter vpliv lastnosti temeljnih tal in natančnosti modela temeljnih tal na obremenitve v konstrukciji. Ugotovili smo, da se rezultati analiz, izvedenih z enostavnejšima modeloma razlikujejo od rezultatov računske analize, opravljene s 3D modelom temeljnih tal. Primerljivejše rezultate daje analiza z uporabo psevdo-povezanega koncepta.

Language:Slovenian
Keywords:interakcije temeljnih tal in konstrukcije, togost temeljne plošče, lastnosti temeljni tal, modeli temeljnih tal, Winklerjeva hipoteza s konstantnim koeficientom reakcije tal, psevdo-povezan koncept, 3D model temeljnih tal, SAP2000, Plaxis 3D
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2016
Publisher:[B. Klinc]
Place:Ljubljana
UDC:624.131.4(043.2)
COBISS.SI-ID:7488097 Link is opened in a new window
Views:1811
Downloads:591
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Secondary language

Language:English
Title:Influence of soil properties and mat foundation stiffness on the structural design
Abstract:
This thesis analyses soil-structure interaction for different foundation mat thicknesses, soil properties and subgrade models. Dimensions of foundation mat, loads and load combinations were determined based on Eurocode standards. Mat thicknesses of 25, 40, 55, 70 and 100 cm were analyzed for two characteristic types of soil: soil with a higher load-bearing capacity, for which an average settlement of 1 cm was assumed and soil with lower load-bearing capacity, for which an average settlement of 10 cm was assumed. Three different subgrade models were used: two different two-dimensional singleparameter mechanical models (Winkler´s hypothesis with constant coefficient of subgrade reaction model and a pseudo-coupled concept model) and a three-dimensional subgrade model, where the stress and strain conditions in the soil are more accurately modeled. Finite element method was used for all analyzed cases using SAP200 and Plaxis 3D computer programs. By comparing the results, the distribution of settlements, internal forces in the structure and the influence of different soil properties and subgrade models were analyzed. The comparisons show that results for a two-dimensional singleparameter mechanical subgrade model with constant coefficient of subgrade reaction differ substantially from the three-dimensional subgrade model results, whereas the results using a pseudo-coupled concept are comparable to the results from a full three-dimensional subgrade model.

Keywords:Soil-structure Interaction, mat stiffness, subgrade characteristisc, subgrade models, Winkler´s hypothesis with constant coefficient of subgrade reaction, pseudo-coupled concept, 3D subgrade models, SAP2000, Plaxis 3D

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