TY - JOUR AU - Juhász, Erika AU - Fischer, Szabolcs TI - Investigation of the modified Ballast Breakage Index for laboratory test series using the Proctor compactor machine JF - ACTA POLYTECHNICA HUNGARICA J2 - ACTA POLYTECH HUNG PY - 2025 SN - 1785-8860 UR - https://m2.mtmt.hu/api/publication/34818876 ID - 34818876 LA - English DB - MTMT ER - TY - JOUR AU - Brautigam, András AU - Szalai, Szabolcs AU - Légmán, Nikoletta AU - Fischer, Szabolcs TI - Laboratory investigation on seams between rails and hardened fine-grained as well as Hadfield steel plates prepared by manual arc welding JF - ACTA POLYTECHNICA HUNGARICA J2 - ACTA POLYTECH HUNG VL - 22 PY - 2025 SN - 1785-8860 UR - https://m2.mtmt.hu/api/publication/34777287 ID - 34777287 LA - English DB - MTMT ER - TY - JOUR AU - Labar, Benjamin AU - Bektaş, Nurullah AU - Kegyes-Brassai, Orsolya Katalin TI - Enhancing Seismic Performance: A Comprehensive Study on Masonry and Reinforced Concrete Structures Considering Soil Properties and Environmental Impact Assessment JF - ADVANCES IN CIVIL ENGINEERING J2 - ADV CIV ENG VL - 2024 PY - 2024 SP - 1 EP - 20 PG - 20 SN - 1687-8086 DO - 10.1155/2024/4505901 UR - https://m2.mtmt.hu/api/publication/34830518 ID - 34830518 AB - Approximately 20,000 people are killed annually on average by building and infrastructure collapses and failures caused by seismic activities. In earlier times, seismic design codes and specifications set minimal requirements for life safety performance levels. Earthquakes can be thought of as recurring events in seismically active areas, with severity states ranging from serviceability to ultimate levels. Buildings designed in accordance with site-specific response spectra, which take into account soil properties based on ground motion amplification data, are better at withstanding such forces and serving their design purposes. This study aims to investigate the site response of reinforced and masonry buildings, considering the effect of soil properties based on the amplification of ground motion data, and to compare the life cycle assessment of the buildings under consideration based on the design and the site-specific response spectrum. In terms of soil properties and site-specific response spectra, STRATA is used to determine the site-specific response for the considered locations for a return period of 475 years for 100 realizations based on the randomization of site properties. For structural analysis, AxisVM software, which is a compatible finite element analysis, is used for building design and analysis, generating comparative results based on the design- and site-specific spectra. To determine and identify potential failures in the model, response spectra were applied to understand the difference in horizontal deflection in two different instances (for elastic design- and site-specific spectra). After building design and analysis is performed, a life cycle analysis in terms of environmental impact assesments using OpenLCA and IdematLightLCA is done. This is done to ascertain the additional expenses in terms of ecocosts and carbon footprints on some failed elements in the structure which are required to make the buildings more resilient when the site-specific response spectrum is applied and to compare the potential economic losses that may occur based on ecological costs. The study presents a comprehensive investigation into the seismic response of masonry and reinforced concrete buildings in Győr, Hungary, incorporating advanced geophysical techniques like multichannel surface wave (MASW) and structural analysis software, AxisVM. Additionally, tailored retrofitting strategies are explored to enhance structural resilience in seismic-prone regions. Significant ground amplifications in soil properties across different profiles are revealed, emphasizing the effectiveness of these strategies in reducing structural deflection and improving resilience. Highlights of the results are observed where the site-specific response spectra are higher than the EC8 design response spectrum. Furthermore, the research underscores the substantial environmental impact, considering both ecocosts and CO2 emissions associated with retrofitting measures, highlighting the importance of sustainable structural interventions in mitigating seismic risks. LA - English DB - MTMT ER - TY - JOUR AU - Mohammed, Dilshad AU - Horváth, Balázs TI - Public perception of autonomous vehicles acceptance in Hungary JF - INTERNATIONAL REVIEW OF APPLIED SCIENCES AND ENGINEERING J2 - INT REV APPL SCI ENG VL - 2024 PY - 2024 SN - 2062-0810 DO - 10.1556/1848.2024.00769 UR - https://m2.mtmt.hu/api/publication/34825345 ID - 34825345 AB - The integration of Autonomous Vehicles (AVs) into our modern society hinges on gaining widespread acceptance from potential road users. To indicate the preparedness of these road users and elucidate their perspectives regarding the use of AVs in future, it is imperative to conduct surveys gauging public acceptance and satisfaction with this emerging mode of transportation. This paper reports the results of a comprehensive questionnaire study involving 1,000 individuals in Gyor City. The survey's primary objective was to assess participants' attitudes and willingness to embrace autonomous vehicles within the city's road networks. The study delved into various socio-demographic factors, such as age, gender, and employment status, while also exploring participants' prior knowledge and opinions regarding the advantages and limitations of AVs. The findings reveal a generally favorable disposition among the public toward the inclusion of AVs in urban traffic, paving the way for the acceptance of mixed traffic patterns. Notably, respondents in younger age groups exhibit greater enthusiasm for incorporating AVs into their daily transportation, whereas individuals aged 65 and above express more reservations, displaying a conservative outlook. Furthermore, participants with prior knowledge and a deeper understanding of AVs exhibit a markedly more positive inclination toward this emerging technology compared to those lacking such familiarity. LA - English DB - MTMT ER - TY - JOUR AU - Nabochenko, Olga AU - Sysyn, Mykola AU - Krumnow, Norman AU - Fischer, Szabolcs TI - Mechanism of cross-level settlements and void accumulation of wide and conventional sleepers in railway ballast JF - RAILWAY ENGINEERING SCIENCE J2 - RAILWAY ENG SCI PY - 2024 PG - 23 SN - 2662-4745 DO - 10.1007/s40534-024-00329-5 UR - https://m2.mtmt.hu/api/publication/34821928 ID - 34821928 AB - The cross-level and twist irregularities are the most dangerous irregularity types that could cause wheel unloading with the risk of derailments and additional maintenance expenses. However, the mechanism of the irregularities initiation and development is unclear. The motivation of the present study was the previous experimental studies on the application of wide sleepers in the ballasted track. The long-term track geometry measurements with wide sleepers show an enormous reduction of the vertical longitudinal irregularities compared to the conventional track. However, wide sleepers had higher twist and cross-section level irregularities. The present paper aims to explain the phenomenon by discrete element method (DEM) modeling the development process of sleeper inhomogeneous support at cross-level depending on the sleeper form. The DEM simulations show that the maximal settlement intensity is up to 3.5 times lower for a wide sleeper in comparison with the conventional one. Nevertheless, the cross-level differential settlements are almost the same for both sleepers. The particle loading distribution after all loading cycles is concentrated on the smaller area, up to the half sleeper length, with fully unloaded zones under sleeper ends. Ballast flow limitation under the central part of the sleeper could improve the resilience of wide sleepers to the development of cross-level irregularities. The mechanism of initiation of the cross-level irregularity is proposed, which assumes the loss of sleeper support under sleeper ends. The further growth of inhomogeneous settlements along the sleeper is assumed as a result of the interaction of two processes: ballast flow due to dynamic impact during void closing and on the other side high pressure due to the concentration of the pressure under the middle part of the sleeper. The DEM simulation results support the assumption of the mechanism and agree with the experimental studies. LA - English DB - MTMT ER - TY - JOUR AU - Bozsaky, Dávid AU - Kőrössi, Éva TI - A plexi építőipari felhasználása - I. JF - MAGYAR ÉPÍTÉSTECHNIKA J2 - MAGYAR ÉPÍTÉSTECHNIKA VL - 62 PY - 2024 IS - 3-4 SP - 8 EP - 11 PG - 4 SN - 1216-6022 UR - https://m2.mtmt.hu/api/publication/34812853 ID - 34812853 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Hammami, Amira AU - Borsos, Attila TI - Safety of cyclists interacting with autonomous vehicles: A combined microscopic simulation and SSAM analysis JF - TRAVEL BEHAVIOUR AND SOCIETY J2 - TRAVEL BEHAV SOC VL - 36 PY - 2024 SN - 2214-367X DO - 10.1016/j.tbs.2024.100805 UR - https://m2.mtmt.hu/api/publication/34802381 ID - 34802381 LA - English DB - MTMT ER - TY - JOUR AU - Nabochenko, Olga AU - Sysyn, Mykola AU - Fischer, Szabolcs TI - Ballast Settlement Accumulation in Zones with Unsupported Sleepers JF - TRANSPORTATION INFRASTRUCTURE GEOTECHNOLOGY J2 - TRANSP INFRASTRUCT GEOTECHNOL PY - 2024 SN - 2196-7202 DO - 10.1007/s40515-024-00388-5 UR - https://m2.mtmt.hu/api/publication/34792428 ID - 34792428 AB - The high influence of impact and vibration on the behavior of crushed stone and ballast materials has been known for a long time. The zones with unsupported sleepers, which are always present in transition zones, crossings, welds, etc., are typically characterized by impact interaction, ballast full unloading, and additional preloading. However, no studies on ballast layer settlements consider impact vibration loading. Moreover, the influence of the cyclic loading on the ballast settlement intensity is considered ambiguously, with both decelerating and accelerating trends. The comprehensive literature review presents the influence of factors on settlement intensity. The present study aims to estimate the long-term processes of sleeper settlement accumulation depending on the loading factors: impact, cyclic loading, and preloading. The typical for a void zone ballast loading pattern was determined for various void sizes and the position along the track by using a model of vehicle-track interaction that was validated by experimental measurements. The loading patterns were parametrized with four parameters: maxima of the cyclic loading, impact loading, sleeper acceleration, and minimal preloading. A specially prepared DEM simulation model was used to estimate the ballast settlement intensity after initial settlement stabilization for more than 100 loading patterns of the void zone cases. The settlement simulation results clearly show that even a low-impact loading pattern causes many times increased settlement intensity than ordinary cyclic loading. Moreover, the initial preloading in the neighbor-to-void zones can cause even a decrease in the settlement intensity compared to the full ordinary or partial unloading. A statistical analysis using a machine learning approach and an analytic one was used to create the model for the intensity prediction regarding the loading patterns. The analytic approach demonstrates somewhat lower prediction quality, but it allows to receive plausible and simple analytic equations of the settlement intensity. The results show that the maximal cyclic loading has a nonlinear influence on the settlement intensity that corresponds to the 3–4 power function, and the impact loading is expressed by the linear to parabolic function. The ballast’s minimal preloading contributes to the reduction of the settlement intensity, especially for high cyclic loadings that are typical for neighbor-to-void zones. The results of the present study could be used for the complementing of the present phenomenological equations with the new factors and further application in the algorithms of the settlements accumulation prediction. LA - English DB - MTMT ER - TY - JOUR AU - Brinissat , Marame AU - Ray, Richard AU - Kuti, Rajmund TI - Predicting multi-span bridge maximum deflection: Numerical simulation and validation JF - IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING J2 - IOP CONF SER MATER SCI ENG VL - 1304 PY - 2024 IS - 1 SN - 1757-8981 DO - 10.1088/1757-899X/1304/1/012016 UR - https://m2.mtmt.hu/api/publication/34774556 ID - 34774556 AB - Deflection is one of the main parameters often required to reflect and monitor the overall health state of bridge structures. Several approaches have been developed to monitor deflection accurately and economically. This research proposes a theoretical method to estimate the maximum deflection of the longest section of a seven-span continuous bridge using stress data collected through strain gauges. Firstly, initial data were collected from field tests under various controlled loadings to obtain the maximum deflections and stresses. Then, the stress-deflection regression equations are derived to reconstruct deflection from estimated gauges. Finally, the maximum deflection values are compared with analytical results using finite element simulations to verify the method’s effectiveness. LA - English DB - MTMT ER - TY - JOUR AU - Shafaie, Vahid AU - Ghodousian, Oveys AU - Ghodousian, Amin AU - Cucuzza, Raffaele AU - Movahedi Rad, Majid TI - Integrating push-out test validation and fuzzy logic for bond strength study of fiber-reinforced self-compacting concrete JF - CONSTRUCTION AND BUILDING MATERIALS J2 - CONSTR BUILD MATER VL - 425 PY - 2024 SN - 0950-0618 DO - 10.1016/j.conbuildmat.2024.136062 UR - https://m2.mtmt.hu/api/publication/34763222 ID - 34763222 LA - English DB - MTMT ER -