dc.creator | Stevanović, Boško D. | |
dc.date.accessioned | 2019-11-22T13:32:01Z | |
dc.date.available | 2019-11-22T13:32:01Z | |
dc.date.issued | 2003 | |
dc.identifier.uri | https://grafar.grf.bg.ac.rs/handle/123456789/1792 | |
dc.description.abstract | U okviru ove disertacije prikazana su teorijska i eksperimentalna istraživanja u oblasti
spregnutih nosača od drveta i betona. Eksperimentalnim istraživanjima obuhvaćene su tri
međusobno povezane grupe ispitivanja:
- ispitivanje fizičkih i mehaničkih karakteristika materijala ugrađenih u spregnute nosače
drvo-beton (drvo, beton, sredstva za sprezanje);
- određivanje modula pomerljivosti između drveta i betona za različite tipove veza,
odnosno sprezanja;
- ispitiyanje spregnutih nosača drvo-beton izvedenih različitim tipovima mehaničkih
spojnih sredstava.
Cilj ispitivanja bio je praćenje ponašanja spregnutih nosača pri eksploatacionom i
graničnom opterećenju, odnosno, utvrđivanje njihovog naponskog i deformacijskog stanja
za različite faze opterećenja sve do loma. U tu svrhu ispitano je osam spregnutih nosača
sistema proste grede, raspona 4,0 m, sa armiranobetonskom pločom (b/d=60/7 cm) i
gredom od lepljenog lameliranog drveta (b/h= 10/20 cm). Međusobna veza betonske ploče i
drvene grede ostvarena je mehaničkim spojnim sredstvima (ekserima E50/150 i zavrtnjima
фЮ/150) sa četiri načina (tipa) veze drvo-beton. Ispitivanje je izvršeno u posebnom
čeličnom ramu, opterećenje je nanošeno hidrauličkom presom, a deformacije su merene
ugibomerima i memim trakama.
Prikazano je i eksperimentalno određivanje modula pomerljivosti za primenjene tipove
veza i dat predlog modela za njegovo ispitivanje.
Pored eksperimentalnog istraživanja data je i analitička metoda proračuna po teoriji
elastičnog sprezanja, kao i numerička analiza nosača primenom metode konačnih
elemenata i poređenje dobijenih rezultata.
Prikazan je pregled dosadašnjih teorijsko-eksperimentalnih istraživanja u oblasti sprezanja
drveta i betona, kao i primena spregnutih nosača u konstrukcijama mostova, stambenih i
drugih objekata.
Rad rezultira preporukama za osavremenjavanje važeće tehničke regulative iz oblasti
drvenih i spregnutih konstrukcija, a saglasno izrazitoj aktuelnosti i strucnoj opravdanosti
tematike, prezentirani su i mogući pravci za dalji naučno-istraživački rad u ovoj oblasti. | sr |
dc.description.abstract | The dissertation presents theoretical and experimental research of composite wood and
concrete beams. Experimental study comprise three inter-related groups of investigation:
- physical and mechanical characteristics of built-in materials in composite wood-concrete
beams (wood, concrete, fasteners for composite action);
- estimation of slip modulus between wood and concrete for different types of connectors
in composite action;
- experimental testing of composite wood-concrete beams with different types of
connections. _
The goal of the study was the investigation of the behaviour of composite beams under
service and ultimate load, with evaluation of stresses and deformations for different phases
under the load up to the complete failure. Therefore, eight simple-supported composite
beams, with the span of 4.0 m with reinforced concrete slab (b/d = 60/7 cm) and glulam
beam (b/h = 10/20 cm) were tested. The composite action was achieved with mechanical
fasteners (nails E50/150 and bolts ф10/150), with four different types of a wood-concrete
connection. Testing was performed in a separate steel frame, loading was accomplished
with a hydraulic press, while deformations were measured with dial-gauges and strain-
gauges.
Also, experimental evaluation of slip modulus was performed for all types of connections,
resulting in a proposal of a model for its experimental determination.
Beside the experimental results presented, analytical method for design according to the
elastic theory is given, as well as numerical analysis of a composite beam with the use of
Finite Element Analysis, together with the comparison of the results. Literature review
covers up-to-date theoretical and experimental research studies-as-welbas applications of
composite beams in bridges, residential and other structures.
Research study results in recommendations for innovation of current standards for wooden
and composite structures. In accordance with distinct relevance of the topic and huge
potential for the structural application, possible avenues for further research studies for
composite wood-concrete beams are given. | en |
dc.language.iso | sr | sr |
dc.rights | openAccess | sr |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.subject | wood | sr |
dc.subject | concrete | sr |
dc.subject | nail | sr |
dc.subject | bolt | sr |
dc.subject | connection | sr |
dc.subject | composite beam | sr |
dc.subject | shear connectors | sr |
dc.subject | slip modulus | sr |
dc.title | Ponašanje spregnutih nosača tipa drvo-beton izvedenih mehaničkim spojnim sredstvima pri eksploatacionom i graničnom opterećenju | sr |
dc.type | doctoralThesis | sr |
dc.rights.license | BY-NC-ND | sr |
dc.identifier.fulltext | https://grafar.grf.bg.ac.rs/bitstream/id/6851/bitstream_6851.pdf | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_grafar_1792 | |
dc.type.version | publishedVersion | sr |