Potresna analiza in analiza ojačitvenih ukrepov za grad Golnik : diplomska naloga

Ošterbenk, Jure (author), Bosiljkov, Vlatko (mentor), Kržan, Meta (co-mentor)

V diplomskem delu je narejena seizmična analiza gradu Golnik in primerjalna študija ojačitvenih ukrepov, s katerimi povečujemo potresno odpornost obravnavane konstrukcije. Po začetnem kronološkem opisu stavbe sledi opis zasnove objekta in opis stanja poškodovanosti nosilnih elementov, ki temelji zgolj na vizualnem pregledu konstrukcije. V teoretičnem delu naloge je sprva na kratko predstavljeno obnašanje zidanih stavb med delovanjem potresa in opis različnih porušnih mehanizmov zidovja. Sledi opis postopka preverjanja potresne odpornosti, kot ga navaja standard Evrokod 8-3 za obstoječe zidane stavbe. Predstavljena in razloţena je mnoţica sanacijskih in ojačitvenih ukrepov, s katerimi lahko zidanim stavbam izboljšamo obnašanje med delovanjem potresnega vpliva. Računska analiza je bila opravljena s programom za nelinearno seizmično analizo obstoječih in novih zidanih konstrukcij 3Muri. V ta namen je podan kratek opis programskega orodja in poenostavljene nelinearne N2 metode. V praktičnem delu diplomske naloge je sprva opravljena potresna analiza osnovnega – izhodiščnega modela konstrukcije, ki sluţi kot osnova za kasnejšo primerjalno analizo. V nadaljevanju so analizirani modeli z različnimi ojačitvenimi ukrepi, kot so vgradnja zidnih vezi, zamenjava podajnih lesenih stropov s togimi, utrditev zidovja z armiranim ometom, injektiranjem in polimernimi FRP trakovi ter vgradnja armiranobetonskih okvirjev. Vsak ukrep je bil izbran na podlagi študije različnih rezultatov predhodnih analiz in predvidevanja o morebitnem odzivu konstrukcije. Izkaţe se, da glavno teţavo predstavlja nepravilna zasnova konstrukcije, saj je odziv stavbe na potresni vpliv zaradi neenakomerne razporeditve sten po tlorisu izrazito neugoden (torzijski zasuk). Rezultati kaţejo, da več ojačitvenih ukrepov pripomore k izpolnjevanju zahtev sodobnih standardov o potresni varnosti, a le z vgradnjo armiranobetonskih okvirjev na JZ delu doseţemo primeren odziv konstrukcije.

• Language: Slovenian
• Keywords: gradbeništvo, UNI, grad Golnik, sanacije, utrditev, zidane stavbe, push-over analiza, potresna odpornost
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [J. Oštrbenk]
• Year: 2012
• Number of pages: XXI, 103 str.
• PID: 20.500.12556/RUL-32595
• UDC: 624.042.7:624.07(043.2)
• COBISS.SI-ID: 6061409
• Publication date in RUL: 10.07.2015

Secondary language

• Language: English
• Title: Seismic analysis and analysis of strengthening measures for the Golnik castle

Abstract

This thesis contains the seismic analysis of the Golnik castle and the comparative study of strengthening measures to increase the seismic resistance of the investigated structure. In the introduction chronological description of the development of the building is presented, followed by description of the building design and the condition of the structural elements based solely on visual inspection. In the theoretical part, the performance of the masonry buildings during the seismic action and characteristic masonry failure modes are briefly introduced. The assessment of the seismic resistance according to the Eurocode 8-3 standard for the existing masonry buildings follows. A comprehensive set of retrofitting and strengthening measures for the improvement of the seismic performance is presented and explained. The seismic analysis was made by 3Muri programme – a software for non-linear seismic analysis of existing and new masonry buildings. The thesis also contains a brief description of the programme and brief explanation of the simplified N2 method. In the empirical part, the seismic analysis of the structure in existing state was made and it served as a reference for the comparative study later on. Models with different strengthening measures were analysed, as for example incorporation of the tie rods, substitution of the flexible wooden floors with the rigid ones, strengthening of masonry with jacketting, grout injections and FRP stripes as well as strengthening of the building with introduction of reinforced concrete frames. Each measure was chosen on the basis of the preliminary analysis study and according to the anticipation of the possible structure response. According to the results of the analysis, main problem is irregular layout of the structure, since the irregular wall distribution in the ground plan causes an explicitly harmful response on the seismic load (torsion twist). The results also indicate that contemporary standard demands for seismic safety can be achieved with various strengthening measures; however, the appropriate building response can only be attained by introducing the reinforced concrete frames in the SW part of the castle.