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Nosilnost tal - primerjava rezultatov analitične enačbe in numeričnih analiz : diplomska naloga
ID Kogovšek, Ema (Author), ID Logar, Janko (Mentor) More about this mentor... This link opens in a new window

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Abstract
V diplomski nalogi so predstavljeni izračuni nosilnosti tal pod plitvimi pasovnimi temelji, različnih širin in globin temeljenja, pri različnih obtežnih primerih. Predstavljeni in primerjani so rezultati analitičnih enačb iz Evrokoda 7 (SIST EN 1997-1) ter rezultati numeričnih analiz v programu Plaxis, ki temelji na metodi končnih elementov. Velik pomen pri rezultatih, dobljenih s programom Plaxis, ima gostota mreže končnih elementov. Pri določenih kombinacijah parametrov in zelo gosti mreži KE se pri numerični analizi ne aktivira enak mehanizem porušitve kot ga opisuje analitična enačba. Temelj se v teh primerih zgolj ugrezne v tla. Izračunana mejna stanja v tleh pri numerični analizi so v večini primerov večja kot izračunana nosilnost tal po analitičnih enačbah, ni pa pri vseh modelih tako. To pomeni, da z računom nosilnosti tal z uporabo analitične enačbe nismo vedno na varni strani. Pri primerjavi rezultatov obeh analiz smo ugotovili, da manjša kot je širina temelja, večje je odstopanje rezultatov. Prav tako do večjega odstopanja pri rezultatih analitične in numerične analize pride pri nedreniranih pogojih pri večji obremenjenosti s horizontalno obtežbo H ter pri dreniranih pogojih pri večjem razmerju horizontalne in vertikalne obtežbe H/V. Pri ekscentrično obremenjenem temelju, je odstopanje rezultatov analiz mnogo večje kot pri temelju, ki ni ekscentrično obremenjen.

Language:Slovenian
Keywords:nosilnost tal, mejna stanja nosilnosti, analitična enačba, Plaxis, numerična analiza, metoda končnih elementov, plitvi pasovni temelji
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Place of publishing:Ljubljana
Publisher:[E. Kogovšek]
Year:2021
PID:20.500.12556/RUL-130579 This link opens in a new window
UDC:624.131.524:004(497.4)(043.2)
COBISS.SI-ID:77404675 This link opens in a new window
Publication date in RUL:16.09.2021
Views:1782
Downloads:165
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Secondary language

Language:English
Title:Bearing capacity - comparison of results of analytical equations and numerical analyses : graduation thesis
Abstract:
The Graduation Thesis presents calculations of soil bearing capacity under shallow strip foundations of different widths and depths of foundations and various load cases. The results of analytical equations from Eurocode 7 (SIST EN 1997-1) and the results of numerical analyses in the Plaxis program, which is based on the finite element method, are presented and compared. Significant impact on the results obtained by the Plaxis program has the density of the finite element mesh. For certain combinations of parameters and very fine finite elements mesh in numerical analyses, the same failure mechanism is not activated as the one described by analytical equation. In these cases the foundation just punches into the soil. The calculated limit states in the soil in numerical analyses are in most cases higher than the calculated bearing capacity according to analytical equations, but this is not the case in all models. This means that we are not always on the safe side by calculating the bearing capacity of the soil using the analytical equation. When comparing the results of both analyses, we found that the smaller the width of the foundation, the greater the deviation of the results. There is also a larger deviation in the results of analytical and numerical analyses in undrained conditions with bigger horizontal load H and in drained conditions with higher ratio of horizontal and vertical load H/V. With an eccentrically loaded foundation, the deviation of the analyses is much larger than with a foundation that is not eccentrically loaded.

Keywords:bearing capacity, ultimate limit state, analytical equation, Plaxis, numerical analysis, finite element method, shallow strip foundations

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