6 research outputs found
Investigations of reinforced concrete members strengthened by laminatesunder explosive loading. Part 3, Experimental results for reinforced concrete beams and columns
W pracy przedstawiono wyniki bada艅 do艣wiadczalnych p艂yt 偶elbetowych. Badania przeprowadzono dla element贸w 偶elbetowych, zwyk艂ych bez dodatkowego wzmocnienia oraz dla element贸w wzmocnionych wysokowytrzyma艂o艣ciowymi pow艂okowymi laminatami z w艂贸kien aramidowych, szklanych i w臋glowych. Zasadnicz膮 cz臋艣ci膮 pracy jest prezentacja wynik贸w bada艅, na kt贸re sk艂adaj膮 si臋 schematy mechanizm贸w zniszczenia oraz trwa艂e przemieszczenia p艂yt.The results of experimental investigations of reinforced concrete plates were introduced in the present part of the paper. Investigations were carried out for two kinds of reinforced concrete elements, i.e., plain elements without additional strengthening and for elements strengthened by high-strength coating laminates made from aramide, glass, and carbon fibres. The schemes of failure mechanisms and the permanent displacements of plates were presented as the principal results of the investigations. It was stated in the result of investigations, that reinforced concrete structural elements strengthened by high-strength laminates show, under the explosive loading enlargement the carrying capacity, decrease in displacements, the limitation of the destruction areas of the concrete, enlarged ability to absorption of the energy. The respective parameters of effort and deformation depend on the kind of material strengthening and the configuration of the strengthening. It was confirmed that the application of coating strengthening generates the new effects of local type in reinforced concrete elements, namely swelling the concrete under laminate, the thread and superficial separation of the laminate, in this on the whole surface, the tearing the laminate and, first of all, decrease in the range of the failure of the element and elimination of the spread of the damaged fragments of the concrete
Investigations of reinforced concrete elements strengthened by laminates under explosive loading. Part 1, Description of investigation programme and investigations of structural materials
W pracy przedstawiono motywacj臋 podj臋cia oraz koncepcj臋 realizacji zamierzenia badawczego. W pierwszej cz臋艣ci pracy przedstawiono opis programu bada艅 do艣wiadczalnych element贸w 偶elbetowych. Badania przeprowadzono dla trzech rodzaj贸w element贸w 偶elbetowych zwyk艂ych bez dodatkowego wzmocnienia oraz dla element贸w wzmocnionych wysokowytrzyma艂o艣ciowymi pow艂okowymi laminatami z w艂贸kien aramidowych, szklanych i w臋glowych. Opisano stanowiska do badania element贸w obci膮偶onych wybuchowo. Przedstawiono charakterystyk臋 oddzia艂ywania wybuchu na badane elementy wraz z metod膮 szacowania obci膮偶enia wybuchowego. Zaprezentowano wyniki bada艅 materia艂贸w konstrukcyjnych: betonu, stali zbrojeniowej i laminat贸w wykorzystanych do wykonania belek, s艂up贸w i p艂yt 偶elbetowych b臋d膮cych przedmiotem bada艅 w pracy.The justification of undertaking and a conception of realization of the investigations of reinforced concrete elements under the explosive load were presented in the paper. The description of the experimental investigations programme of reinforced concrete elements was introduced in the present part of the paper. The investigative stands and the method of the investigations in which impulsive loading was generated by the explosive material were described. The characteristics of influence of explosion on investigative elements were introduced and the method of estimation of the loading values on the considered elements was given. The results of the investigations of the structural materials of which studied reinforced concrete elements were made were introduced in the present part of the paper. Investigations concerned to the concrete, reinforcing steel, and laminates from aramide, glass, and carbon fibres
Investigations of reinforced concrete members strengthened by laminates under explosive loading. Part 2, Experimental results for reinforced concrete beams and columns
W pracy przedstawiono wyniki bada艅 do艣wiadczalnych belek i s艂up贸w 偶elbetowych. Badania przeprowadzono dla element贸w 偶elbetowych zwyk艂ych bez dodatkowego wzmocnienia oraz dla element贸w wzmocnionych wysokowytrzyma艂o艣ciowymi pow艂okowymi laminatami z w艂贸kien aramidowych, szklanych i w臋glowych. Zasadniczym celem pracy jest prezentacja wynik贸w bada艅, na kt贸re sk艂adaj膮 si臋 schematy mechanizm贸w zniszczenia oraz podstawowe parametry reakcji dynamicznej badanych element贸w.The results of the experimental investigations of reinforced concrete beams were introduced in the present part of the paper. Investigations were carried out for two kinds of reinforced concrete elements, i.e. plain elements without the additional strengthening and for elements strengthened by high-strength coating laminates made from aramide, glass and carbon fibres. Principal aim of the paper is introduction of the results of the investigations, i.e., the schemes of the failure mechanisms, change in the time of the support force, displacements and acceleration parameters