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Analysis of seismic risk assessment methods and their application to Belgrade (Serbia) neighborhood
No full textThe aim of this paper is the analysis and application of three methodologies for rapid seismic risk
assessment of buildings: Adriseismic (Italy), FEMA P-154 (USA) and IZIIS (North Macedonia). First, the aforementioned methodologies were applied to 438 buildings in the selected neighborhood of Vračar of Belgrade, Serbia, using data from the field and from the documentation of these buildings. Based on the field assessment, the advantages and disadvantages of each methodology was identified, and their comparison was also performed. Also, a modification of the Adriseismic methodology was carried out by calibrating the basic input parameters (coefficients) and introducing new coefficients in order to adapt the original methodology, which was developed in Italy, to the Serbian conditions, in terms of technical regulations and construction practice. By comparing the results obtained by application of the mentioned three methodologies, important conclusions were drawn about differences in the estimated seismic risk for the surveyed of buildings
Prediction model for calculation of the limestone powder concrete carbonation depth
No full textThe efficient way to mitigate the impact of the concrete industry on climate change is to reduce the clinker content in the concrete mix. Beside incorporating supplementary cementitious materials (SCMs), it is possible to use high filler content combined with concrete mix optimisation. Limestone powder emerges as a promising filler mineral due to its availability and ready-to-use technology. In this work, the carbonation resistance of concrete with a high limestone powder content (45–65% of the powder phase) was experimentally tested. Test results showed that, with an optimized mix design featuring low water content and increased paste and plasticizer volume, concrete mixes satisfied high workability and strength demands for commonly applied strength classes. However, carbonation resistance remains a challenge. After two years in indoor natural conditions, carbonation depths were 8%, 28%, and 67% greater than referent Portland cement concrete for mixes with 47%, 58%, and 65% limestone powder content, respectively. Further analyses showed the inapplicability of the existing fib Model Code 2010 service life prediction model to limestone powder concrete. Based on a comprehensive database of experimental results, the modification of the fib prediction was proposed. A full probabilistic service life analysis revealed that for concrete with more than 20% limestone powder content and for both 50 and 100-years’ design service life, the currently prescribed concrete cover depths in European standards should be increased, depending on the carbonation exposure class
Experimental study of pedestrian-induced vibration of cross-laminated timber floors
No full textDesign of long-span and lightweight building floors has increasingly been governed by vibration criteria, and cross-laminated timber (CLT) floors are no exception. Due to their high stiffness to-mass ratio, CLT floors are highly susceptible to pedestrian-induced vibrations. The paper presents extensive experimental research designed to study modal properties and pedestrian induced vibration response of numerous long-span multi-panel CLT floors. The tested floor specimens include a wide range of bare CLT floors, as well as CLT hybrids with concrete and FRP bars to improve their vibration performance
Comparison of estimated nominal values of static charactersitics based on measurements by different methods
Get PDFOne of the quality requirements of thermal imaging devices used in surveillance systems and in forensics refers to the assessment of its capabilities in relation to remote detection, recognition and identification of far-off objects of interest.
This paper discusses the concept of spatial frequency and compares the estimated values of the nominal static characteristics of the range based on the measurement of the characteristics of a thermal imaging camera according to standard methods (MRTD - Minimum Resolvable Tempera-ture Difference, MDTD - Minimum Detectable Temperature Difference, TOD - Triangle Orientation Discrimination) on an arbitrarily chosen thermal imaging camera
Izgradnja II faze poslovnog objekta eko efikasne zgrade u Podgorici
No full textEko efikasna zgrada u Podgorici je poslovni objekat planiran za smeštaj Ministarstva ekologije,
prostornog planiranja i urbanizma i Studijske jedinice za ekologiju Univerziteta Crne Gore.
Izgradnja objekta je započeta 2012.godine a nakon završetka I faze radova koja je
podrazumevala AB i čeličnu konstrukcije izvođenje je prekinuto do daljnjeg. Nastavak radova
tj. II faza je počela u februaru 2022.godine a nakon završetka tendera na kome je posao dobila
kompanija STRABAG d.o.o. Beograd. U ovom radu dat je akcenat na prikazu najinteresantnijih
pozicija radova – drvene konstrukcije krovnih “kubusa” i tekstilne fasade
Modeli loma čeličnih grednih nosača sa otvorima u rebru
No full textAs an alternative to trusses and open-web joist systems, beams with web openings are lightweight, long-spanning structural elements that bind structural role (efficient load distribution) and functionality in a visually acceptable way by allowing service routes to be installed within their cross-section height. Due to the presence of web openings, load transfer is accompanied by complex stress distributions in the section web, causing failure modes that are distinguishable from those of solid I-section beams. This paper summarizes the different failure modes of the beams with web openings that have been discovered and confirmed in numerous experiments of reference scientific researches. Based on the state-of-the art in this structural area, the predictions of different failure modes that are affected by influencing geometric parameters are provided.Prisustvo otvora u rebrima nosača prouzrokuje složenu raspodelu napona i posledično modele loma koji se značajno razlikuju od onih kod tradicionalnih čeličnih grednih elemenata. Shodno tome, mnoge studije su se bavile ovim problemom kroz eksperimentalna ispitivanja i numeričku analizu. Ovaj rad rezimira sprovedena istraživanja o različitim modelima loma ovih nosača. Na osnovu dostupne literature, formirana je baza sa više od stotinu eksperimentalnih i numeričkih primera, što je dalje omogućilo bolje sagledavanje zaključaka pojedinih autora. Na osnovu pomenute baze, data su predviđanja očekivanih modela loma na osnovu različitih odnosa geometrijskih parametara
Influence of curing period on some mechanical and durability-related properties of limestone powder concrete
No full textThis study investigates the influence of curing periods on the mechanical and durability-related properties of limestone powder concrete, focusing on the potential of limestone as a sustainable alternative to traditional materials, primarily cement. The research explores the effects of varying cement replacement percentages (30-55%) and curing durations (1, 3, 7, 14, and 28 days) on concrete properties such as compressive strength, flexural strength, water permeability, and resistance to chloride ingress. The limestone fineness was also tested using two powders from the same chemical composition, but different particles size. Results indicate that longer curing periods generally enhance concrete performance, but not in all cases. The greatest benefits of extending the curing period was observed in the case of water penetration depth, so the average difference between 1 and 28 days curing was about 50%. Flexural strength also saw a substantial increase of up to 24% over the same curing period. However, increasing the curing period from 7 to 28 days resulted in an unexpected average reduction in concrete compressive strength of 13%. Despite previous results, a positive impact of a higher limestone powder content was observed in all cases, except for resistance to chloride penetration. Concretes that contained limestone powder had a significantly lower (as much as 186%) resistance to chloride penetration, compared to the reference (with the highest dispersion of results). The study found no significant influence of limestone particle size on concrete properties
Predictive Analytics of In-game Transactions: Tokenized Player History and Self-Attention Techniques
No full textPlayers’ purchases in free-to-play online games often serve as crucial indicators of user engagement and behavior. Understanding these purchases not only enhances the personalization of the gaming experience but also enables the optimization of game monetization strategies. This paper introduces a methodology for predicting players’ purchases using Transformers neural networks based on the SelfAttention technique, customized for processing sequential data. By discretizing the values of features representing a player’s history and leveraging tokenized inputs related to the discretized history, the methodology aims to forecast whether a player will make a purchase within the next 3, 5, or 7 days. The proposed approach is further validated by comparing its performance with commonly adopted machine learning techniques such as Random Forest, XGBoost, and Multilayer Perceptron, demonstrating its advantages in predicting player purchases
Zero-waste porous pavement alternatives for flood resilient cities
No full textPrinciples of circular economy aiming to reduce GHG emission have been introduced recently in the transformation of urban areas in smart cities. These principles can be employed for sustainable urban drainage systems (SUDS) improvement in order to reduce deteriorating urban flooding effects. Urban development is usually coupled with a rapid increase in imperious surface area and consequent stormwater runoff. Traditional urban drainage practice in Serbia combined with the climate change effects results in urban flooding in many cities in Serbia, on almost annual basis. Porous paving (PPav) is an essential SUDS technique that reduces the runoff volumes/rates and simultaneously improve the stormwater quality. Waste and recycled materials (WRM) have already been used for PPav construction. However, current PPav SUDS can have multifunctional purpose (stormwater tretament) when employing WRM. The utilization of solidified wastewater treatment plant sludge (WWTPS) and fly ash (FA) as partial substitutes for cement in porous concrete pavements has been initiated to explore the advantages in terms of performance, environmental impact, and economic viability resulting from the use of waste materials. This effort aims to enhance urban flood resilience through sustainable resource utilization
Mogućnosti optimizacije dilatacione spojnice industrijskih podova u cilju povećanja efikasnosti
No full textConstruction joints for industrial floor buildings are designed to relieve longitudinal stresses due
to volumetric changes in large concrete surfaces. Various geometries of construction joints have
been designed to obtain main constructional requirements, i.e. horizontal movements of the
concrete slab panels due to expansion and contraction and transfer of vertical loads between
adjoining slabs. This paper presents an experimental and numerical investigation of the free movement construction joint with embedded formwork and steel dowel bars as an integral
solution. Analysis has the main focus on the two main aspects of the construction joint behaviour,
i.e. resistance and stiffness, through obtained failure modes and joint geometry, towards higher
joint efficiency.Dilatacione spojnice u podnim pločama industrijskih zgrada su konstruisane da obezbede
oslobađanje podužnih napona koji se javljaju kao posledica promena u zapremini velikih
površina betonskih ploča. Dilatacione spojnice različitih geometrija se konstruišu u svrhu
postizanja osnovnih konstrukcijskih zahteva: obezbeđivanje horizontalnih pomeranja usled
skupljanja i tečenja betona, kao i prenošenje vertikalnog opterećenja između susednih segmenata
betonskih ploča. U ovom radu predstavljeno je eksperimentalno i numeričko ispitivanje
dilatacione spojnice sa ugrađenom čeličnom oplatom i čeličnim moždanicima kao integralnim
rešenjem. Analizom su obuhvaćene dve osnovne karakteristike ponašanja dilatacione spojnice:
nosivost i krutost, kroz ostvarene oblike loma i uticaj geometrije dilatacione spojnice u svrhu
postizanja veće efikasnosti