Primerjava eno-in dvodimenzionalne analize nihanja tal pri potresni obtežbi

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Language:	Slovenian
Year of publishing:	2005
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[T. Melink]
UDC:	624.131.55(043.2)
COBISS:	2981729
Views:	1906
Downloads:	462
Average score:	0 (0 votes)
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Secondary language:	English
Secondary title:	Comparison between one- and two-dimensional analysis of the propagation of seismic waves
Secondary abstract:	The present work deals with the comparison between two computer programs for analysing the propagation of seismic waves, Shake and Plaxis. These two programs use different ways for solving seismic wave propagation problem. In the first part of my diploma work some comparisons of one-dimensional analysis of one-, two- and three-layer ground profiles with all possible combinations of the three types of soils with very different characteristics have been done. The soils were first modeled by linearelastic and then elasto-plastic material model. The results showed that the computer programs are comparative only for linear-elastic soil models. In the second part the comparison between one- and two-dimensional analysis of quite simplified model of Bovec basin and with the linear-elastic soil models was performed. I have analyzed the simplified 2D model based on the existing geo-electrical investigations of the chosen profile. Then I chose three typical sections on my 2D profile and I made 1D models for them. The effects of the second dimension were clearly seen in the comparison between one- and two-dimensional analysis. The shape of the basin caused in substantial majority of the observed points favourable effects on the ground-motion in the sense that the amplitude of the acceleration values of the points on the surface were smaller than in 1D models. Furthermore, the 2D models confirmed previously known basin effects, like the amplification of the ground-motion at the edges of the basin and that on the ground surface, besides horizontal also vertical components of the acceleration occured in spite of the input groundmotion which consisted only from horizontal accelerations.
Secondary keywords:	ground response to seismic load;computer programs Plaxis and Shake;linear-elastic and elasto-plastic soil models;one- and two- dimensional analysis
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. Ljubljana, Fakulteta za gradbeništvo in geodezijo, Oddelek za gradbeništvo, univerzitetni študij, konstrukcijska smer
Pages:	XVII, 92 str.
Type (ePrints):	thesis
Title (ePrints):	Comparison between one- and two-dimensional analysis of the propagation of seismic waves
Keywords (ePrints):	odziv tal na potresno obtežbo;računalniška programa Plaxis in Shake;linearno-elastični in elasto-plastični modeli zemljine;eno- in dvodimenzionalne analize
Keywords (ePrints, secondary language):	ground response to seismic load;computer programs Plaxis and Shake;linear-elastic and elasto-plastic soil models;one- and two- dimensional analysis
Abstract (ePrints):	Diplomsko delo obravnava primerjavo dveh računalniških programov za analizo širjenja potresnega valovanja v tleh, Shakea in Plaxisa, ki se reševanja problema lotevata različno. V prvem delu diplomske naloge so bile izvedene primerjave enodimenzionalne analize eno-, dvo- in troslojnih profilov tal vseh možnih kombinacij treh zemljin precej različnih lastnosti. Zemljine so bile najprej modelirane kot linearno-elastične in nato še kot elasto-plastične. Izkazalo se je, da sta programa primerljiva le za linearno-elastične modele zemljin. V drugem delu sledi primerjava eno- in dvodimenzionalne analize na precej poenostavljenem modelu Bovške kotline ter linearno-elastičnem modelu tal. 2D model sem oblikovala s s poenostavljenim profilom tal, ki je bil določen na podlagi izsledkov geoelektričnih raziskav, ki so bile izvedene na izbranem profilu. Na svojem 2D modelu sem nato izbrala tri karakteristične prereze in zanje naredila še 1D modele. Pri primerjavi eno- in dvodimenzionalne analize so bili lepo vidni učinki druge dimenzije. Oblika kotline je imela v veliki večini opazovanih točk ugoden učinek na gibanje tal v smislu, da so bile amplitude pospeškov na površju manjše v primerjavi z enodimenzionalnimi modeli. Prav tako so se pri 2D modelih pokazale določene osnovne zakonitosti vpliva oblike kotline, kot so ojačanje pospeškov tal ob robovih kotline in na površju, poleg horizontalnih, prisotnost tudi vertikalnih pospeškov kljub vzbujanju nihanja podlage le v horizontalni smeri.
Abstract (ePrints, secondary language):	The present work deals with the comparison between two computer programs for analysing the propagation of seismic waves, Shake and Plaxis. These two programs use different ways for solving seismic wave propagation problem. In the first part of my diploma work some comparisons of one-dimensional analysis of one-, two- and three-layer ground profiles with all possible combinations of the three types of soils with very different characteristics have been done. The soils were first modeled by linearelastic and then elasto-plastic material model. The results showed that the computer programs are comparative only for linear-elastic soil models. In the second part the comparison between one- and two-dimensional analysis of quite simplified model of Bovec basin and with the linear-elastic soil models was performed. I have analyzed the simplified 2D model based on the existing geo-electrical investigations of the chosen profile. Then I chose three typical sections on my 2D profile and I made 1D models for them. The effects of the second dimension were clearly seen in the comparison between one- and two-dimensional analysis. The shape of the basin caused in substantial majority of the observed points favourable effects on the ground-motion in the sense that the amplitude of the acceleration values of the points on the surface were smaller than in 1D models. Furthermore, the 2D models confirmed previously known basin effects, like the amplification of the ground-motion at the edges of the basin and that on the ground surface, besides horizontal also vertical components of the acceleration occured in spite of the input groundmotion which consisted only from horizontal accelerations.
Keywords (ePrints, secondary language):	ground response to seismic load;computer programs Plaxis and Shake;linear-elastic and elasto-plastic soil models;one- and two- dimensional analysis
ID:	8309331