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Tehnički i drugi zahtevi za elemente za zidanje prema novom pravilniku i seriji standarda SRPS EN 771
No full textStructural integrity assessment of welded bucket-wheel boom
Get PDFResearch is conducted on the causes of damage and the structural integrity assessment of the bucket-wheel boom welded lattice structures, before and after the repair of vital structures. Additionally, the paper describes the investigation conducted based on the results of non-destructive tests (visual-, magnetic particle-, dye penetrant-, and ultrasonic tests), results of tensometric measurements that refer to the stress-strain state, and results based on numerical calculation of stresses by finite element method, performed through the use of a 3D model in the software Radimpex Tower 6.0 (R). The results of tests and research performed after the repair of damaged structural welded sections show that the operational procedures are being obeyed
Komparativna analiza ispitivanja požarnootpornih vrata prema srpskim standardima
Get PDFPrilikom zaštite zgrada od požara neophodno je podeliti objekte na požarne sektore.
Kako ne bi došlo do prenosa vatre iz jednog požarnog sektora u drugi, potrebno je ugraditi
požarnootporna vrata. Sva ugrađena požarnootporna vrata moraju da poseduju dokaz o
otpornosti prema požaru, čija se vrednost dobija ispitivanjem u akreditovanoj laboratoriji.
Ispitivanje može da se izvrši prema dva standarda: SRPS U.J1.160 iz 1988. godine, kao i SRPS
EN 1634-1 iz 2018. godine.
U radu je predstavljena komparativna analiza između dva standarda u kojima su dati uslovi u
peći, način ugradnje uzorka, oprema koja se koristi za ispitivanje, kao i vrednost za otpornost
prema požaru. Standard SRPS EN 1634-1 mnogo detaljnije opisuje način ugradnje, postavljane
termoparova, proces ispitivanja, kao i vrednost za otpornost prema požaru u odnosu kako je to
dato u SRPS U.J1.160
The design of magneto-plasmonic nanostructures formed by magnetic Prussian Blue-type nanocrystals decorated with Au nanoparticles
No full textWe have developed a general protocol for the preparation of hybrid
nanostructures formed by nanoparticles (NPs) of molecule-based
magnets based on Prussian Blue Analogues (PBAs) decorated with
plasmonic Au NPs of different shapes. By adjusting the pH, Au NPs
can be attached preferentially along the edges of the PBA or
randomly on the surface. The protocol allows tuning the plasmonic
properties of the hybrids in the whole visible spectrum
Modeling of Damping Effects in Soil – Structure Interaction in the Pushover Analysis
Get PDFThe paper shows aspects of damping modelling in nonlinear static pushover analysis (NSPA) of structures through systematization of damping types and formed flow diagram, depending on the type of applied target displacement analysis. By applying the developed flow diagram, in the process of creating and analysing numerical models of structures, it is possible to very efficiently consider which type of damping should be selected and how to introduce damping in nonlinear static pushover analysis. Generally speaking, in nonlinear static pushover analysis (NSPA) damping is introduced indirectly by reducing the response spectrum. The problem of introducing damping is considered taking into account the soil-structure interaction, modelling the kinematic effects and the damping effects of the foundation, i.e., the ground. Parametric analysis was performed by varying the parameters: the effect of foundation depth, i.e., the impact of the existence of underground floors and the impact of damping. Based on the developed pushover curves, the levels of target displacements for each individual condition were determined, and then these discrete values were classified according to soil categories. By connecting such discrete values of the target displacement, a cumulative curve was constructed, i.e., an envelope of possible states of drifts and forces. By applying the proposed procedure, it is possible to consider the possible level of nonlinear deformations of the system, taking into account the effect of interaction with the soil and damping. The research established that the introduction of the soil-structure interaction can significantly affect the values of global drift, and thus partially the correction of the relevant total lateral seismic force. The sensitivity of the change in the relevant total lateral seismic force is much lower than the displacement, because in the nonlinear domain the system has much less stiffness, even in certain situations the stiffness is zero, so a small increase in load can produce much greater deformation. Also, the research found that for different types of soil and different damping values, the fragments of the pushover curves, obtained by interpolating the target displacements for the same soil types, overlap at certain interval
Novel method suitable for decreasing the roofing tile failures generated during rapid drying
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