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Comparison of Numerical Analysis and Rapid Risk Assessment Results on Building Examples in Serbia
No full textThis paper presents an overview and comparison of the results obtained from numerical
procedure and methodologies for rapid seismic risk assessment on selected structures in Serbia
(Kraljevo and Belgrade). The buildings risk assessment in areas prone to significant seismic
hazards is conducted by using traditional seismic analyses and methodologies for rapid seismic
risk assessment. The paper showcases the setups and outcomes of pushover analysis on two
structures (masonry and RC structures) in Serbia. These results are compared with the outcomes
of three rapid risk assessment methodologies – Adriseismic, FEMA P-154, and IZIIS. Based on
the comparison, conclusions are drawn regarding the methods accuracy and the simplicity of
their application. Also, the advantages of using these risk assessment approaches are presented
Numerical modelling of confined masonry by a 3D micro model
No full textThis article presents an investigation into seismic resistance of modern confined masonry built from hollow clay blocks with large holes for thermal insulation, which is glued by polyurethane glue instead of mortar. Based on the results of two experimental tests from cyclic shear tests a detailed micro numerical model based on the finite element method was developed in the Abaqus software. The developed model was able to accurately predict the global response of the walls in terms of a force-displacement pushover curve as well as the damage evolution and pattern in the masonry and in the tie-columns. Because the tie-columns were thinner than the masonry, special type of damage occurred at the contact between these two elements. This effect was also successfully reproduced by the model
Primena aktivnih tehničkih mera zaštite od buke u procesu projektovanja puteva
No full textPorast motorizacije savremenog društva je neupitno doveo do niza negativnih
uticaja na životnu sredinu (zagađenje vazduha, vode i tla, povećan nivo buke i vibracija,
zauzimanje prostora, angažovanje zelenih površina u svrhu realizacije saobraćajne
infrastrukture, vizuelna degradacija prostora, uticaj na ljude, floru i faunu u najširem
smislu). Struktura i obim uticaja zavise od mnogobrojnih faktora, između ostalog lokalnih
prirodnih i društvenih uslova, sredstva prevoza, ranga saobraćajnice u mreži kao i saobraćajnog
opterećenja predmetne saobraćajnice. U radu će akcenat biti na fenomenu buke,
kao jednom od negativnih uticaja koje je najjednostavnije kvantifikovati, ali i smanjiti,
kako u fazama samog projektovanja, tako i prilikom izbora specifičnih konstruktivnih rešenja.
U radu će se prikazati moguća građevinska rešenja za smanjenje buke od motornog
saobraćaja, kao i uporedna analiza efekata različitih aktivnih mera zaštite od buke
Finite Element Analysis of Bending Behaviour of Glulam Beams Reinforced with CFRP Plates
No full textTimber structures can effectively be reinforced using externally or internally bonded fibre reinforced polymer (FRP) composites. This paper presents numerical analysis of bending behaviour of glulam beams reinforced with carbon fibre reinforced polymer (CFRP) plates. Nonlinear three-dimensional finite element model was developed and validated by experimental tests carried out on beams with CFRP plates strategically located in the tension zone between the bottom two laminations. Progressive damage model was introduced to effectively tackle the softening behaviour of wood. The numerical results have shown good agreement with the experimental results in relation to load-deflection relationship, ultimate load and stiffness. Nonlinear behaviour of reinforced beams was achieved in the numerical analysis, confirming the finite element model to be accurate past the linear-elastic range
Plovni putevi i pristaništa kroz rešene primere
Get PDFKnjiga Plovni putevi i pristaništa kroz rešene primere je udžbenik iz istoimenog predmeta na Građevinskom fakultetu u Beogradu. Do akreditacije 2021. godine ovo je bio obavezan predmet najpre na osnovnim, a potom na master akademskim studijama. Od akreditacije 2021. godine postaje izborni predmet uprkos činjenicama da kroz Republiku Srbiju prolaze tri međunarodna plovna puta - reke Dunav, Sava i Tisa i da Republika Srbija u skladu sa potpisanim međunarodnim sporazumima ima obavezu da osigura bezbednu plovidbu duž sektora koji prolaze kroz njenu teritoriju
Determination of ionospheric models using global navigational satellite systems and Bernese GNSS software
Get PDFSince the last few decades of the 20th and the beginning of civilian application of NAVigation Satellite Timing And Ranging Global Positioning System (NAVSTAR GPS) established by the United States Department of Defense, satellite positioning is the most widespread technology for position determination on any place in the Earth's surface (Hofmann-Wellenhof et al., 2008). Besides positioning, a Global Navigation Satellite Systems (GNSS; a common name for all operational navigation systems worldwide) technology is used for other research applications such as atmospheric parameter estimation, i.e., ionospheric determination (Seeber et al., 2003). This paper presents the possibility of the GNSS technology as a tool for determining ionospheric models by the Bernese GNSS Software (Dach et al., 2015). Bernese supports three types of models to represent the ionosphere: local models based on Taylor series expansions, and station-specific and global (or regional) models based on spherical harmonic expansions (Schaer, 1999). Mentioned Ionospheric models (also called Ionospheric maps) can be produced in Bernese ION format or as a common data-exchange IONosphere EXchange (IONEX) format (Schaer et al., 1998). Based on these formats, it is possible to determine the quantity that characterizes the current state of the ionosphere, the so-called Total Electron Content (TEC).Book of Abstracts and Contributed Paper
Doprinos određivanju jonosferskog kašnjenja GNSS satelitskih signala na teritoriji Republike Srbije
Get PDFVišefrekvencijski GNSS satelitski signali i njihova dostupnost omogućavaju istraživanja u nediferenciranom i nekombinovanom modelu u kome je pojedinačni signal na svakoj frekvenciji odgovarajuće nezavisno opažanje. Ovakve mogućnosti izazivaju veliko interesovanje ne samo u geodetskim istraživanjima već i u mnogim oblastima primene GNSS opažanja. Na geometrijskoj putanji signala između satelita i prijemnika, značajni izvor grešaka GNSS merenja dolazi zbog sredine prostiranja elektromagnetskih talasa. Greške koje se pripisuju prostiranju signala su jonosferski i troposferski uticaji. Navedeni izvori grešaka značajno utiču na kvalitet određenih pseudodužina, pa samim time i na kvalitet određenog položaja prijemnika u vidu trodimenzionalnih koordinata. U radu je prikazana analiza i određivanje jonosferskog kašnjenja GNSS satelitskih signala na osnovu određivanja Total Electron Content – TEC na pet stanica (Beograd, Leskovac, Sombor, Zaječar i Kraljevo) na prostoru Republike Srbije. U cilju određivanja vrednosti TEC-a, korišćen je softver pod nazivom „GPS-TEC analysis“ razvijen u okviru Institute for Scientific Research, Boston College, USA, koji omogućava određivanje TEC vrednosti na putanji između satelita i prijemnika. Prikupljanje podataka izvršeno je u okviru 2022. godine tako da merne sesije obuhvate karakteristične datume u okviru godine kada se očekuju najveća kolebanja u kontekstu sezonskih varijacija.Multi-frequency GNSS satellite signals and their availability enable research in undifferentiated and uncombined models in which a single signal at each frequency is a corresponding independent observation. Such possibilities are reflected by the significant interest in geodetic research as well as in many areas of application of GNSS observation. On the geometric path of the signal between the satellite and the receiver, a significant source of GNSS measurement errors comes from the medium of propagation of electromagnetic waves. Errors attributed to signal propagation are ionospheric and tropospheric signal delay. The mentioned error sources significantly affect the quality of certain pseudorange and, thus, the quality of the receiver's position in the form of three-dimensional coordinates. This paper presents the analysis and determination of the ionospheric delay of GNSS satellite signals based on the determination of Total Electron Content - TEC at five stations (Beograd, Leskovac, Sombor, Zaječar, and Kraljevo) in the territory of the Republic of Serbia. In order to determine TEC values, the software called "GPS-TEC analysis" developed within the Institute for Scientific Research, Boston College, USA was used, which enables the determination of the TEC value on the path between the satellite and the receiver. The data collection was carried out within the year 2022 so that the measurement sessions include characteristic dates when the most significant fluctuations are expected in the context of seasonal variations
Linking BrIM to BMS for bridges – concepts
No full textBridge Information Model (BrIM) is currently replacing drawings as main deliverable in new bridge project.
Several use cases for BrIM over its lifetime is identified, as well as a discussion of the use case potential. Use
cases include, but are not limited to, linking Bridge Management Systems (BMS) and BrIM, handling
inspection data, visualizing inspection results and damage, tracking maintenance actions and structural
changes. It may also serve for the analysis of residual strength, as digital twin in structural health monitoring
(conditional maintenance) and as risk-based decision-making tool for the allocation of resources.
Thus, this paper will form a basis for updates of relevant IFC classes in the BrIM data structure to facilitate
seamless communication between BrIM and BMS systems. Thereby the grossly different level of detail in
BrIM (individual objects), GIS (road network) and BMS (asset portfolio), the data aggregation and drill-down,
and the portability of existing data collections are major concerns
Low-Cycle Fatigue Damage Model for Ductile Materials
Get PDFIn this paper, a uniaxial material model with the ability to describe progressive damage growth, but also to provide a reliable estimation of fatigue life in the low-cycle regime of loading, is presented. The determination of damage in the material is based on two levels of modeling mechanical behavior. The element on the micro level establishes an elastoplastic damage model that depends on the maximum strain. The second level of modeling is defined by the connection of microelements with different values of total energy dissipated at failure. Hysteretic energy dissipated in heat during cyclic loading is determined for each micro element based on the analytical expression provided by a hysteretic operator. Different distributions of values of maximum dissipated energy can thus provide various fatigue damage evolution laws. The analytical expression for hysteretic energy loss for one element and its numerical implementation is enabled by the computational model whose parameters can be defined by monotonic and cyclic loading experimental tests. Validation of the introduced material model can additionally be concluded by constant and variable strain-controlled experiments, as well as with the comparison of constructed failure curves with existing methods for assessment of mean stress effect in fatigue analysis.http://icdm4.lsu.edu/index.php/progra
Geologically-Driven Migration of Landmines and Explosive Remnants of War—A Feature Focusing on the Western Balkans
Get PDFLandmines and explosive remnants of war are still present in the Western Balkans and remain a deadly legacy of the hostilities at the end of the 20th century. Over the years, several incidents have occurred in Bosnia and Herzegovina, in Serbia, and in Croatia where intact ordnance has caused injuries and fatalities. Floods, torrential flows, and gravitational mass movements pose a particular threat. Landmines and explosive remnants of war are mobilized and displaced into previously uncontaminated areas. We first discuss the historical and technical background of this hazardous situation. We then show which hydro-morphological processes are responsible for the mobilization and displacement. We then illustrate how a prediction of the likely contaminated areas can be obtained. We show that the problem can only be tackled using a stochastic-deterministic model. However, for the eventual development of risk-hazard maps, preliminary work using laboratory experiments and field surveys is required. The article, therefore, proposes a novel approach to the problem in an international research project. The aim would be to produce risk-hazard maps that can be used by elected decision-makers, administrative authorities, and emergency personnel in affected municipalities