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Title:VPLIV MODELIRANJA STAVBE NA VELIKOST PROJEKTNIH TORZIJSKIH UČINKOV
Authors:Horvat, Urška (Author)
Skrinar, Matjaž (Mentor) More about this mentor... New window
Peruš, Iztok (Co-mentor)
Files:.pdf UN_Horvat_Urska_2016.pdf (4,03 MB)
 
Language:Slovenian
Work type:Undergraduate thesis (m5)
Typology:2.11 - Undergraduate Thesis
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:Bistvo diplomskega dela je bila primerjava računskih modelov konstrukcije, predvsem v smislu opazovanja vpliva modeliranja konstrukcije na velikost projektnih torzijskih učinkov. Zanimalo nas je, kako modeliranje torzije vpliva na izračun nihajnih časov, ter posledično na izračun projektnih potresnih sil in posledično tudi pomikov. Analizo z različnimi modeli in primerjavo rezultatov smo izvedli na primeru enostavne dvoetažne stavbe. Aktualni standard EN 1998-1:2006 pri potresni analizi objekta dovoljuje poenostavitve, ki so odvisne od pravilnosti konstrukcije (tlorisna pravilnost konstrukcije in pravilnost po višini). Tako je za tlorisno pravilne konstrukcije, kot je bila obravnavana konstrukcija, dovoljena uporaba poenostavljenih ravninskih modelov, kjer s posrednim načinom (faktor ) modeliramo učinke torzije. Poleg ravninskega modela smo zaradi primerjave rezultatov izvedeli še analize za dva prostorska modela. Primerjava vseh period ravninskih in prostorskih modelov direktno ni možna, saj pri prostorskih dodatno nastopijo nihajni časi, ki pripadajo torzijskemu nihanju (pri ravninskih jih ni), zato smo primerjave rezultatov omejili na prva dva direktno primerljiva nihajna časa. Odstopanja med modeli (predvsem pri pomikih) so posledica različnih načinov modeliranja. Pomembna ugotovitev, ki sledi iz rezultatov, se nanaša na premik masnega središča, za katerega nam EC8 predpisuje, da ga moramo premakniti za naključno ekscentričnost. Rezultati so namreč pokazali, da premik masnega središča ne vpliva bistveno na nihajni čas, temveč predvsem na nihajne oblike. Tako v modelu za določitev nihajnih časov ni potrebno modelirati ekscentričnosti ampak zgolj v modelu za določitev posledic sile F_b.
Keywords:potresno inženirstvo, potresna odpornost, Evrokod 8, torzija stavb, pravilne konstrukcije, ravninski model, tridimenzionalni model, toga diafragma, SAP2000
Year of publishing:2016
Publisher:[U. Horvat]
Source:Maribor
UDC:624.042.7:699.841(043.2)
COBISS_ID:20439574 Link is opened in a new window
NUK URN:URN:SI:UM:DK:WKVSLFNL
Views:1189
Downloads:75
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Categories:KTFMB - FG
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Secondary language

Language:English
Title:THE INFLUENCE OF BUILDING MODELLING ON THE TORSIONAL DESIGN EFFECTS
Abstract:The prime goal of the Diploma thesis was to compare the computational models of the structure, with the emphasis on observation of influences of structural’s modelling on the magnitude of the design torsional effects. The main question was how torsion’s modeling impacts the calculation of the periods, and consequently the calculation of the design seismic forces, and further, also displacements. The analysis of the various models and comparison of the results was performed on a simple two storey building. Current European Standard EN 1998-1: 2006 allows simplification within seismic analysis of structures, and those are dependent on the structure’s regularity (regularity in plan, and regularity in elevation). Thus, for the structures, regular in plan, as our considered structure, EC8 allows for implementation of simplified plane models, where the effects of torsion are taken into the account by the indirect method (factor ). To obtain a common platform for the model comparison we further analyzed the considered structure by two spatial model. A direct comparison of all periods from planar and spatial models is not possible, since the spatial model further offers periods that to belong to the torsional oscillations (and are not available from the plane model). Therefore, so we limited the comparison of results to the two first directly comparable periods. Discrepancies between the models’ results (especially in displacements) are the result of different ways of modeling. An important conclusion that follows from the obtained results refers to the displacement of the centre of mass, which is prescribed by EC8 to take into account accidental torsional effects. The results have namely shown that the displacement of the center of gravity does not significantly affect the periods, but primarily the eigenshapes. Thus, is not necessary to model the displacement of the centre of mass in the model for determining the periods, but exclusively in the model where the effects of force Fb are determined.
Keywords:torsion of buildings, seismic engineering, earthquake resistance, Eurocode 8, regular building, planar model, spatial model, rigid diaphragms, SAP2000


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