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- 저자 : Ljiljana Živkovi c (검색결과 2 건)
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Smilja Živković,Miroslav Bešević,Martina Vojnić Purčar,Ljiljana Kozarić 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.11
The aim of this paper is to investigate the influence of eccentric load and the presence of an opening near the column on the punching shear strength of reinforced concrete (RC) flat slab without shear reinforcement using analytical investigation and numerical simulations. A model based on the finite element method is proposed and its validation is confirmed in this study, by comparing the results with the existing experimental studies available in published literature. Twenty slabs supported directly on columns were analyzed, along with variation of load and opening position in the slab. The punching shear strength for all slabs was calculated according to Eurocode 2 (EC2) and numerically. It was found that the obtained punching shear strength was significantly underestimated by EC2. In addition, this research has shown that the opening position in relation to the direction of the bending moment caused by the eccentric load significantly affects the punching shear strength, while EC2 neglects this position.
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Katarina Nešovi c,Ana Jankovic,Aleksandra Peri c-Gruji c,Maja Vukašinovic-Sekulic,Tamara Radeti c,Ljiljana Živkovi c,박수진,이경엽,Vesna Miškovi c-Stankovi c 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Silver nanoparticles (AgNPs) were synthesized by in situ electrochemical reduction of Ag+ ions in poly(vinyl alcohol)/chitosan/graphene (PVA/CHI/Gr) hydrogel matrices with different concentrations ofchitosan. The physicochemical properties of nanocomposite hydrogels were investigated by UV–visspectroscopy (UV–vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), X-rayphotoelectron spectroscopy (XPS),field-emission scanning electron microscopy (FE-SEM) and Fourier-transform infrared spectroscopy (FT-IR), thermal characteristics were determined by differentialscanning calorimetry (DSC) and mechanical properties were measured by tensile test. The swellingstudies were carried out in phosphate buffer to simulate natural physiological environment and datawerefitted by several kinetic models to determine the diffusion mechanism and diffusion coefficients ofthe swelling medium through the hydrogel matrices. It was shown that the presence of silvernanoparticles increased the uptake capability and equilibrium swelling degree of the compositehydrogels. The antibacterial activity was confirmed against Escherichia coli and Staphylococcus aureus,while the hydrogels without AgNPs exhibited antibacterial properties due to the presence of chitosan. With the addition of AgNPs, the samples showed stronger activity and fast reduction in the number ofcolonies, confirming the synergistic effect of chitosan and AgNPs on the antibacterial activity.
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