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Potresni odziv armiranobetonskih povezanih sten : doktorska disertacija
ID Janevski, Antonio (Avtor), ID Isaković, Tatjana (Mentor) Več o mentorju... Povezava se odpre v novem oknu, ID Gams, Matija (Komentor), ID Fischinger, Matej (Član komisije za zagovor), ID Kolozvari, Kristijan (Član komisije za zagovor), ID Polese, Maria (Član komisije za zagovor)

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Izvleček
This dissertation presents an analysis of the response mechanism of RC walls coupled by slabs without coupling beams. Special attention was devoted to the variable interaction between the slabs and walls and its role in overall seismic behaviour. Adequate numerical models are essential for accurately capturing the interaction between slabs and walls. This dissertation employs the MVLEM numerical model, developed at UL FGG, to describe the response of walls. The MVLEM model was complemented by existing numerical models of RC beams, columns, and beam–column joints. The capabilities of these models were validated by simulating the response of a U-shaped core wall tested at UCLouvain and by two full-scale 10-storey RC buildings tested on the world’s largest shaking table in the E-Defense centre in Japan. The basic response mechanism of RC walls and important parameters influencing this response, particularly the roles of the flexural stiffness and capacity of coupling slabs, were investigated through analysis of the experiments conducted within the HORIZON 2020 SERA-TA project ‘Influence of floorto-wall interaction on the seismic response of coupled wall systems’. Shaking table tests were not conducted as part of the work for this dissertation. However, a numerical simulation of the observed response and an extensive sensitivity study were performed. Previously validated numerical models were used. The test was simulated successfully. The sensitivity study produced valuable information about the influence of the interaction between the slabs and walls and its role in the overall seismic behaviour of RC walls coupled with slabs. To generalise the observations of the shaking table experiment and post-experimental study, an extensive parametric study was conducted on buildings with different configurations (e.g. varying slabto-wall strength ratios, different wall aspect ratios, and subjected to different sets of accelerograms, etc.). The results of the parametric study confirmed the experimental findings. It was shown that for specific wall configurations, the coupling provided only by slabs is not negligible. In cases in which interaction between the slabs and walls is important, the response of the walls is different from that predicted in the design. A study on the inelastic shear force amplification in RC walls coupled only by slabs was conducted. Simple equations for reliable estimation of the demand were proposed. The proposed equations were validated across all buildings considered in the parametric study. Relatively accurate estimates of the shear forces were obtained. Finally, based on the knowledge gained, a simple and efficient pushover-based method for the seismic design of RC walls coupled only by slabs was proposed. The responses of structures designed according to the proposed method were improved in comparison to those obtained for traditionally designed structures.

Jezik:Angleški jezik
Ključne besede:Built environment, doctoral thesis, reinforced concrete walls, reinforced concrete slabs, level of coupling, response mechanism, nonlinear analysis, numerical modelling, parametric study, inelastic shear force amplification, pushover-based design, seismic response
Vrsta gradiva:Doktorsko delo/naloga
Tipologija:2.08 - Doktorska disertacija
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
Kraj izida:Ljubljana
Založnik:[A. Janevski]
Leto izida:2024
Št. strani:XXXVIII, 274 str., [108] str. pril.
UDK:624.012.45:624.042.7(043.3)
COBISS.SI-ID:212786435 Povezava se odpre v novem oknu
Datum objave v RUL:24.10.2024
Število ogledov:82
Število prenosov:38
Metapodatki:XML DC-XML DC-RDF
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Sekundarni jezik

Jezik:Slovenski jezik
Naslov:Seismic response of reinforced concrete coupled walls : doctoral dissertation
Izvleček:
V disertaciji je predstavljena analiza mehanizma odziva AB sten povezanih s ploščami brez gred. Osredotočili smo se na spremenljivo interakcijo med ploščami in stenami ter njenem vplivu na globalen potresni odziv. Za modeliranje omenjene interakcije je treba implementirati ustrezne numerične modele. V okviru disertacije smo za modeliranje sten uporabili numerični model MVLEM, razvit na UL FGG. Slednji je bil dopolnjen z obstoječimi numeričnimi modeli AB stebrov, gred in vozlišč. Ustreznost numeričnih modelov smo preverili s simulacijo odziva AB jedra, preizkušenega na UCLouvain ter dveh 10-etažnih AB stavb, ki sta bili v naravnem merilu preizkušeni na največji potresni mizi na svetu E-Defense na Japonskem. Osnovne mehanizme odziva armiranobetonskih sten, pomembne parametre, ki vplivajo na ta odziv, še zlasti vlogo upogibne nosilnosti in togosti medetažnih plošč smo raziskali s pomočjo analize eksperimentalnih raziskav, izvedenih v okviru projekta HORIZON 2020 SERA-TA ‘Influence of floorto-wall interaction on the seismic response of coupled wall systems’. Omenjeni preizkusi niso bili opravljeni v sklopu te disertacije, izvedena pa je bila numerična simulacija odziva in obsežna občutljivostna analiza. Uporabili smo predhodno verificirane numerične modele. Simulacija se je izkazala za uspešna, rezultati občutljivostne analize pa so podali natančnejši vpogled v interakcijo med ploščami in stenami ter njenem vplivu na globalen potresni odziv AB sten, povezanih s ploščami brez gred. Da bi posplošili opažanja iz eksperimentov in posteksperimentalnih analiz, je bila izvedena obsežna parametrična študija, ki je vključevala stavbe z različnimi konfiguracijami (t.j. različnimi razmerji med nosilnostjo plošč in sten, ter različno geometrijo sten, analiziranih z različnimi nabori akcelerogramov ipd.). Rezultati so potrdili opažanja iz eksperimentov, da je pri določenih konfiguracijah povezanost, ki jo zagotavljajo le plošče brez gred, pomembna. Kjer je prišlo do znatne interakcije med ploščami in stenami, je bil odziv sten drugačen od predvidenega v fazi projektiranja. Opravljena je bila študija povečanih strižnih sil v nelinearnem območju v AB stenah, povezanih s ploščami brez gred. Predlagali smo enostavne enačbe za zanesljivo oceno potresnih zahtev, ki temeljijo na potisni analizi. Izraze smo validirali za vse stavbe, obravnavane v parametrični študiji in dosegli razmeroma natančno oceno strižnih sil. Na podlagi pridobljenega znanja smo predlagali enostavno in učinkovito metodo za potresno odporno projektiranje AB sten, povezanih s ploščami brez gred, ki temelji na potisni analizi. Odzivi tako projektiranih konstrukcij so bili boljši od tistih, ki so bili dobljeni v primeru, ko so bile stavbe projektiranje na podlagi tradicionalnih pristopov, ki temeljijo na metodi sil.

Ključne besede:Grajeno okolje, disertacije, armiranobetonske stene, armiranobetonske plošče, stopnja povezanosti, mehanizem odziva, nelinearna analiza, numerično modeliranje, parametrična študija, povečanje strižnih sil v nelinearnem območju, zasnova na podlagi potisne analize, potresni odziv

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