1. Določitev osenčenosti dolvodne površine betonske pregrade MostePavel Žvanut, Rok Vezočnik, Goran Turk, Tomaž Ambrožič, 2014, izvirni znanstveni članek Povzetek: V prispevku je obravnavana nova metoda za določitev osenčenosti površin, in sicer na podlagi meritev s terestričnim laserskim skenerjem ter z izdelanima računalniškima programoma, ki za izbrano opazovalno točko določita obris terena ter položaj Sonca in osončenost v času. Metoda je predstavljena na primeru pregrade Moste, za katero so bili po skeniranju območja pregrade izdelani obrisi terena iz desetih opazovalnih točk, lociranih v osi dolvodne površine pregrade, za azimute od 80° do 280° pri izbranem horizontalnem kotu in koraku 5°. Za izločitev posameznih grobo pogrešenih točk sta bila izbrana kvantilna ranga 0,998 oziroma 0,997. Iz primerjave rezultatov izračunov med uporabljenima variantama je razvidno, da so zelo podobni, kar kaže, da je število grobo pogrešenih točk zelo majhno. Zelo zanesljive rezultate dobimo že z uporabo kvantilnega ranga 0,998. Iz primerjave rezultatov meritev in izračunov osenčenosti na lokaciji mobilne samodejne vremenske postaje Moste v obravnavanem obdobju sedmih zaporednih jasnih dni v začetku avgusta 2013 pa je bilo ugotovljeno, da se zelo dobro ujemajo, kar potrjuje, da je opisana metoda določitve osenčenosti zelo zanesljiva.
Ključne besede: terestrični laserski skener, betonska pregrada, Moste, obris terena, osenčenost
Objavljeno v DiRROS: 26.09.2025; Ogledov: 410; Prenosov: 230
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2. Load testing of the first stress ribbon bridge in SloveniaĐorđe Đukić, Doron Hekič, Mirko Kosič, Rok Vezočnik, Andrej Anžlin, Andrej Štrukelj, Marjan Pipenbaher, Tomaž Weingerl, 2024, objavljeni znanstveni prispevek na konferenci Povzetek: Paper presents selected results of the diagnostic load testing of a newly-built footbridge in Novo Mesto, Slovenia. The bridge is significant as the first bridge in Slovenia being built with the stress ribbon technology. The diagnostic load testing took place in March 2023 and comprised of three-stage static load testing, dynamic testing with a light truck driving over artificial obstacles, and measurement of ambient vibrations. The consistency between the actual response of the bridge and the response of the finite element (FE) model, used in the design, was evaluated by comparing vertical displacements from the static load testing, natural frequencies and mode shapes. The comparison of the results indicates a satisfactory agreement between the measurements and the response of the FE model, confirming the appropriateness of the employed FE model.
Ključne besede: bridge, bridge response measurements, stress ribon, load test
Objavljeno v DiRROS: 14.08.2024; Ogledov: 1134; Prenosov: 737
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3. Real-time monitoring and analyses of sensory data integrated into the bim platformStanislav Lenart, Veljko Janjić, Uros Jovanovic, Rok Vezočnik, 2021, objavljeni znanstveni prispevek na konferenci Povzetek: Bridges and tunnels, crucial elements of the railway infrastructure, are exposed to various types of deterioration processes. Their condition is a subject of monitoring, as it is important to collect as much as possible information in every life cycle phase to reliably predict their future performance. An enormous quantity of monitoring data is generated during the whole life cycle of these assets. EU funded Shift2Rail research project Assets4Rail which is focusing on measuring, monitoring, and data handling for railway assets, as data management is as important as their generation. This paper presents the major outcomes of the Assets4Rail project and its application to infrastructure projects.
Ključne besede: monitoring, information management, BIM, information management, bridge, tunnel, Assets4Rail
Objavljeno v DiRROS: 23.02.2024; Ogledov: 1500; Prenosov: 1529
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4. Vehicle–bridge interaction modelling using precise 3D road surface analysisMaja Kreslin, Peter Češarek, Aleš Žnidarič, Darko Kokot, Jan Kalin, Rok Vezočnik, 2024, izvirni znanstveni članek Povzetek: Uneven road surfaces are the primary source of excitation in the dynamic interaction between a bridge and a vehicle and can lead to errors in bridge weigh-in-motion (B-WIM) systems. In order to correctly reproduce this interaction in a numerical model of a bridge, it is essential to know the magnitude and location of the various roadway irregularities. This paper presents a methodology for measuring the 3D road surface using static terrestrial laser scanning and a numerical model for simulating vehicle passage over a bridge with a measured road surface. This model allows the evaluation of strain responses in the time domain at any bridge location considering different parameters such as vehicle type, lateral position and speed, road surface unevenness, bridge type, etc. Since the time domain strains are crucial for B-WIM algorithms, the proposed approach facilitates the analysis of the different factors affecting the B-WIM results. The first validation of the proposed methodology was carried out on a real bridge, where extensive measurements were performed using different sensors, including measurements of the road surface, the response of the bridge when crossed by a test vehicle and the dynamic properties of the bridge and vehicle. The comparison between the simulated and measured bridge response marks a promising step towards investigating the influence of unevenness on the results of B-WIM.
Ključne besede: interakcija vozilo in most, terestično lasersko skeniranje, neravnost vozišča, numerično modeliranje
Objavljeno v DiRROS: 26.01.2024; Ogledov: 2049; Prenosov: 977
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5. Digital twins and road construction using secondary raw materialsSebastjan Meža, Alenka Mauko Pranjić, Rok Vezočnik, Igor Osmokrović, Stanislav Lenart, 2021, izvirni znanstveni članek Povzetek: Secondary raw materials (SRMs) tend to be a valuable replacement for finite virgin materials especially since construction works (i.e., building and civil engineering work such as road construction) require vast quantities of raw materials. Using SRM originating from recycling a broad range of inorganic waste materials (e.g., mining waste, different industrial wastes, construction, and demolition waste) has been recognized as a promising, generally more cost-efficient, and environmentally friendly alternative to the exploitation of natural resources. Despite the benefits of using SRM, several challenges need to be addressed before using SRM even more. One of them is the long-term durability and little-known response of construction works built using such alternative materials. In this paper, we present the activities to establish a fully functioning digital twin (DT) of a road constructed using SRM. The first part of the paper is devoted to the theoretical justification of efforts and ways of establishing the monitoring systems, followed by a DT case study where an integrated data environment synthesizing a Building Information Model and monitored data is presented. Although the paper builds upon a small scale, the case study is methodologically designed to allow parallels to be drawn with much larger construction projects.
Ključne besede: digital twins, road construction, circular economy
Objavljeno v DiRROS: 19.07.2023; Ogledov: 3290; Prenosov: 976
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6. Prediction of the peak shear strength of the rock joints with artificial neural networksKarmen Fifer Bizjak, Rok Vezočnik, 2022, izvirni znanstveni članek Povzetek: With the development of computer technology, artificial neural networks are becoming increasingly useful in the field of engineering geology and geotechnics. With artificial neural networks, the geomechanical properties of rocks or their behaviour could be predicted under different stress conditions. Slope failures or underground excavations in rocks mostly occurred through joints, which are essential for the stability of geotechnical structures. This is why the peak shear strength of a rock joint is the most important parameter for a rock mass stability. Testing of the shear characteristics of joints is often time consuming and suitable specimens for testing are difficult to obtain during the research phase. The roughness of the joint surface, tensile strength and vertical load have a great influence on the peak shear strength of the rock joint. In the presented paper, the surface roughness of joints was measured with a photogrammetric scanner, and the peak shear strength was determined by the Robertson direct shear test. Based on six input characteristics of the rock joints, the artificial neural network, using a backpropagation learning algorithm, successfully learned to predict the peak shear strength of the rock joint. The trained artificial neural network predicted the peak shear strength for similar lithological and geological conditions with average estimation error of 6%. The results of the calculation with artificial neural networks were compared with the Grasselli experimental model, which showed a higher error in comparison with the artificial neural network model.
Ključne besede: artificial neural network, camera-type 3D scanner, rock mechanics, rock joint, joint roughness
Objavljeno v DiRROS: 18.01.2023; Ogledov: 1607; Prenosov: 908
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