Construction industry is constantly facing new demands towards fast construction and smallest possibly quantity of work at the construction site. These increasing demands, in the field of composite construction of buildings and bridges, resulted in development of different types of prefabricated composite decks during decades and group arrangement of different types of shear connectors. Positioning of shear connectors into envisaged openings of prefabricated composite decks contributes to smaller quantity of concrete needed to infill openings of prefabricated composite decks. Composite action between steel profile and concrete decks can be achieved using X-HVB shear connectors with powder-actuated fasteners. Anchorage mechanisms developed between steel profile and fasteners during installation process of powder-actuated fasteners are resulting in composite action between steel and concrete. Relatively simple and fast installation process, without requirements for additional equipment and electrical power on the site is characteristic for this type of shear connectors. Experimental investigation of X-HVB shear connectors in prefabricated composite decks through standard push-out tests, according to EN 1994-1-1 is presented in this paper. Shear connectors are positioned at the envisaged openings of prefabricated composite decks at the minimal longitudinal and transversal distances, recommended by the manufacturer. Two different orientations of shear connectors, forward and backwards to shear force direction are experimentally investigated and presented in this paper. Experimentally obtained characteristic shear resistance are compared with recommendations given by manufacturer. Characteristic slip at failure obtained from experimental investigation is compared with requirements given in EN 1994-1-1 in order to determine if this type of shear connector is considered as ductile. Eight specimens in two series are experimentally investigated through standard push-out test. Different characteristic shear resistance and different failure modes are obtained for forward and backward orientation of shear connectors. Experimentally obtained results from standard push-out tests for different orientations of shear connectors are compared with results obtained from extensive numerical analysis performed in Abaqus.
European norms for civil engineering structures, well known as Eurocodes, are set of highly harmonized codes regarding structural issues. Main rules and recommendations for calculation of wind actions on structures are given in EN 1991-1-4 which is the basic document. Also, some advanced analysis regarding wind actions on towers and masts are given in EN 1993-3-1, with the intention to be transferred in the basic document in the later phase. This paper contains a short presentation of the main rules and recommendations for wind action analysis and their comparison with previous regulations JUS (SRPS). The main focus of the paper is on wind action on buildings and comparative numerical example is also given. Some experiences and conclusions from the process of Serbian National Annex preparation are also presented.
Trenutni zahtevi pri projektovanju konstrukcija u zgradarstvu najčešće uslovljavaju primenu konstrukcija velikih raspona, s velikim otvorenim unutrašnjim prostorima, sa spregnutim međuspratnim konstrukcijama od čelika i betona visokih kvaliteta. Takođe, često se zahteva mogućnost naknadne prenamene prostora u druge svrhe, odnosno fleksibilnost prostora koji se može postići većim rasponima. Ovakve težnje prouzrokuju to da konstrukcija ima niže vrednosti sopstvenih frekvencija oscilovanja i manji koeficijent prigušenja, što veoma utiče na dinamički odgovor konstrukcije kada je ona izložena dinamičkom opterećenju, kao što je-na primer-kretanje ljudi unutar objekta. Konstrukcija, pored kriterijuma sigurnosti koji se dokazuje putem graničnih stanja nosivosti, mora da zadovolji i kriterijume funkcionalnosti. Kriterijumi funkcionalnosti zavise od namene objekta, a dokazuju se kon-Asistent student doktorskih studija Nina Gluhović,
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