Strengthening of a Pointed Masonry Arch
| Autor: | Cukarić, Matei |
|---|---|
| Přispěvatelé: | Šćulac, Paulo, Smolčić, Željko, Grandić, Davor |
| Jazyk: | chorvatština |
| Rok vydání: | 2022 |
| Předmět: | |
| Popis: | Tema ovog diplomskog rada je pojačanje zidanih lukova i svodova. Pojačanje postojećih zidanih građevina tema je koja se istražuje diljem svijeta s ciljem produženja uporabnog vijeka i očuvanja povijesnih građevina i spomenika. Današnje teme istraživača baziraju se na istraživanjima metoda koje koriste čelična, karbonska ili staklena vlakna u sustavu PAV (polimeri armirani vlaknima) i TAM (tkaninom armirani mort), te pojačanja čeličnim zategama ili drugim vlaknastim materijalima koji se mogu koristiti kao pojačanje zidanih lukova. U uvodu ovog rada dan je kratki pregled i usporedba učinkovitosti različitih tehnika pojačanja lučnih i svođenih konstrukcija. Zatim je prikazano eksperimentalno istraživanje provedeno na umanjenim drvenim modelima šiljastih lukova. Provedena su ispitivanja na modelima bez pojačanja te s pojačanjem na ekstradosu ili intradosu luka, opterećenim koncentriranom silom u četvrtini raspona. Pokazano je kako se mehanizmi sloma modela pojačanih na ekstradosu ili intradosu razlikuju od modela bez pojačanja. Uz to, provedena su i ispitivanja na potresnom stolu, te nagibni test kao pojednostavljena zamjena za dinamičko ispitivanje. Naposljetku je provedena i numerička analiza, gdje je principom virtualnog rada određena granična vrijednost sile pri kojoj se luk pretvara u labilni mehanizam. This final year project deals with strengthening of masonry arches and vaults. Strengthening of existing masonry buildings is a topic that is being researched all over the world with the aim of extending the design working life and preserving historical buildings and monuments. At present, researches are mostly dealing with methods that use steel, carbon or glass fibers in FRP (fiber- reinforced polymers) and TRM (textile-reinforced mortar) systems, as well as steel ties or other fibrous materials that can be used as strengthening material for masonry arches. First, a brief overview of various techniques for strengthening of arches and vaulted structures and a comparison of their effectiveness is given. It is then followed by an experimental research conducted on scaled pointed arch models made of timber. Tests were carried out on unreinforced models and on models with reinforcement at the extrados or at the intrados of the arch, loaded with a pointed force at quarter span. It is shown that the collapse mechanisms of models reinforced at the extrados or at the intrados differ from models without reinforcement. In addition, shaking table tests were also conducted as well as tilt tests, as a simplified replacement method for dynamic testing. Finally, a numerical analysis was carried out, where using the principle of virtual work the limit value of the loading at which the arch turns into a mechanism was determined. |
| Databáze: | OpenAIRE |
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