TY - JOUR AU - Kövesdi, Balázs Géza AU - Kollár, Dénes AU - Szabó, B. AU - Dunai, László TI - Probabilistic failure assessment of steel eyebars by considering multi-phase nonlinear corrosion model JF - JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH J2 - J CONSTR STEEL RES VL - 224 PY - 2025 IS - Part A PG - 12 SN - 0143-974X DO - 10.1016/j.jcsr.2024.109127 UR - https://m2.mtmt.hu/api/publication/35509937 ID - 35509937 N1 - Export Date: 22 November 2024 Correspondence Address: Kollár, D.; Department of Structural Engineering, Műegyetem rkp. 3., Hungary; email: kollar.denes@emk.bme.hu Funding details: Marine Stewardship Council, MSC Funding details: Magyar Tudományos Akadémia, MTA, ÚNKP-23-1-I-BME-198 Funding details: Magyar Tudományos Akadémia, MTA Funding text 1: The presented research program has been partly financially supported by the Grant MTA-BME Lend\\u00FClet LP2021-06/2021 \\u201CTheory of new generation steel bridges\\u201D program of the Hungarian Academy of Sciences , and by the Grant \\u00DANKP-23-1-I-BME-198 of the New National Excellence Program provided by the Ministry of Culture and Innovation of Hungary ; the financial supports are gratefully acknowledged. Funding text 2: The presented research program has been partly financially supported by the Grant MTA-BME Lend\\u00FClet LP2021-06/2021 \\u201CTheory of new generation steel bridges\\u201D program of the Hungarian Academy of Sciences, and by the Grant \\u00DANKP-23-1-I-BME-198 of the New National Excellence Program provided by the Ministry of Culture and Innovation of Hungary; the financial supports are gratefully acknowledged. The authors would like to express special thanks to the Designers (F\\u0151mterv Co. and MSC Ltd. design offices) of the bridge reconstruction for their cooperation within the expertizing tasks and evaluation of the on-site measurements. Special thanks are given also to the A-H\\u00EDd Co. who executed the reconstruction work of the bridge and provided the opportunity to execute the on-site measurements and gave always strong technical supports. LA - English DB - MTMT ER - TY - JOUR AU - Mansi, Ali AU - Jáger, Bence AU - Kövesdi, Balázs Géza AU - Dunai, László TI - Evaluation of Fatigue-sensitive Details in a Railway Danube Bridge by FE Analysis and SHM Measurements JF - PERIODICA POLYTECHNICA-CIVIL ENGINEERING J2 - PERIOD POLYTECH CIV ENG VL - 69 PY - 2025 IS - 2 SP - 567 EP - 579 PG - 13 SN - 0553-6626 DO - 10.3311/PPci.38708 UR - https://m2.mtmt.hu/api/publication/36073990 ID - 36073990 N1 - The presented research program has been financially sup-ported by the Grant MTA-BME Lendület LP2021-06/2021 "Theory of new generation steel bridges" program of the Hungarian Academy of Sciences and Stipendium Hungaricum Scholarship. Both grants are gratefully acknowledged. AB - Structural health monitoring system (SHM) has an essential role in the prediction of steel bridges behavior and damage detection. Due to site difficulties and economic reasons, it is not possible to instrumenting all sensitive details within the structure. Finite element modelling is an effective tool for analyzing fatigue-sensitive details, as it enables the extension and interpretation of measured data. This study investigates the structural health monitoring (SHM) system of Southern Railway Danube bridge located in Budapest from fatigue sensitive details point of view. The research applies load testing data for the validation of finite elements models (FEM) which are to be used for specifying the sensitive details. Based on a detailed stress analysis, three fatigue-sensitive areas were identified in the bridge, as follows: 1. the cutout holes of cross girder, 2. the cope-holes, and 3. the transvers welding of bottom flange. Artificial cracks are applied in these details separately to investigate the efficiency of SHM system for crack detection. Stress values at the location of strain gauge points of the SHM system are calculated continuously as cracks size increased, simulating the propagation. The results show that the SHM strain gauges in the current placements not highly efficient to detect the cracks of the investigated details. The study extended to propose strain gauge positions to recognize the crack initiation and propagation in these details. LA - English DB - MTMT ER - TY - JOUR AU - Dunai, László AU - Horváth, Adrián AU - Kollár, Dénes AU - Kövesdi, Balázs Géza TI - Reconstruction of the Széchenyi Chain Bridge in Budapest JF - LECTURE NOTES IN CIVIL ENGINEERING J2 - LECTURE NOTES IN CIVIL ENGINEERING VL - 596 PY - 2025 SP - 452 EP - 460 PG - 9 SN - 2366-2557 DO - 10.1007/978-3-031-87316-4_55 UR - https://m2.mtmt.hu/api/publication/36074842 ID - 36074842 N1 - Funding Agency and Grant Number: Hungarian Academy of Sciences [MTA-BME Lendulet LP2021-06/2021] Funding text: The authors express special thanks to the Designers (Fomterv Co. and MSc Ltd. design offices) for their cooperation within the expertizing tasks and evaluation of the onsite measurements. Special thanks are given to the Company Hidepito Co. who did execute the reconstruction work and provided the opportunity to execute the on-site measurements. They gave us always strong technical support during the execution of the measurements. The presented paper has been also supported by the Grant MTA-BME Lendulet LP2021-06/2021 "Theory of new generation steel bridges" program of the Hungarian Academy of Sciences. AB - The Széchenyi Chain Bridge is an almost 170-years-old historical structure located in the downtown of Budapest. Its reconstruction was made between 2020 and 2022, when the deck system of the bridge is replaced by an orthotropic deck and the main girder is renewed. During the design the damages and the rotation of the pins between the eyebars in the chain system were questionable due to corrosion and friction. Therefore, the rotation capacity and the corrosion grade of the chain elements were investigated before and during the reconstruction process to clearly determine the structural health and further lifetime. Four on-site measurements were executed to analyse these issues: (i) loading test to measure the bending moments in the chains and checking the rotation of the pins, (ii) one-year-long monitoring system operating during the renewal process having the aim to check the bending moment distribution in the chain elements during the reconstruction process, (iii) chain element corrosion measurements and (iv) load test of the reconstructed bridge. The paper introduces the new design, the measurement results regarding the corrosion grade and the monitoring system data. The main conclusions of the measurements and accomplishing statistical evaluations are presented in the paper to evaluate the structural health to estimate the further lifetime of the bridge. LA - English DB - MTMT ER - TY - JOUR AU - Dunai, László AU - Horváth, Adrián AU - Kollár, Dénes AU - Kövesdi, Balázs Géza AU - Szigeti, Zoltán AU - Vigh, László Gergely TI - A Széchenyi lánchíd felújítása: korróziós állapotmérés és kockázatelemzés JF - MAGYAR TUDOMÁNY J2 - MAGYAR TUDOMÁNY VL - 186 PY - 2025 IS - 4 SP - 710 EP - 723 PG - 14 SN - 0025-0325 DO - 10.1556/2065.186.2025.4.12 UR - https://m2.mtmt.hu/api/publication/36104605 ID - 36104605 AB - A Széchenyi lánchíd közel 175 éves történeti szerkezetünk, nemzeti szimbólumunk, amelynek legutóbbi felújítására 2021–2023 között került sor. A híd főtartója, a lánckötegek jelentős része több mint százéves, a láncelemeket összekötő csapok elfordulási képessége az előrehaladott korrózió és a jelentős súrlódás miatt kérdéses volt, ami jelentősen befolyásolja a láncelemek és a felfüggőrendszer statikai viselkedését. Ezért a felújítási folyamathoz kapcsolódva a Budapesti Műszaki és Gazdaságtudományi Egyetem Hidak és Szerkezetek Tanszék a tervezőkkel (Főmterv Zrt. és MSc Kft.) együttműködve megvizsgálta a láncelemek csapjai elfordulási képességének, a láncelemek korróziós állapotának a teherbírásra gyakorolt hatását. További tervezői és kutatói együttműködést igényelt a lehorgonyzó tömbön átvezetett nyomócsővezeték szerkezetre gyakorolt hatásának vizsgálata. A cikkben ezen két, a híd felújításához kötődő vizsgálat eredményét mutatjuk be. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Dunai, László AU - Kövesdi, Balázs Géza AU - Kollár, László Péter AU - Hegyi, Péter AU - Pál, Gábor AU - Kemenczés, András AU - Medveczki, István TI - Az Osztószigeti ferdekábeles híd – kábelcsillapítók tervezése és fejlesztése JF - MAGYAR TUDOMÁNY J2 - MAGYAR TUDOMÁNY VL - 186 PY - 2025 IS - 4 SP - 724 EP - 734 PG - 11 SN - 0025-0325 DO - 10.1556/2065.186.2025.4.13 UR - https://m2.mtmt.hu/api/publication/36108484 ID - 36108484 AB - A ferdekábeles hidakon alkalmazott kábelek jellemzően érzékenyek a gyalogosok által keltett dinamikai hatásokra, aminek következtében sok esetben a kábelekre csillapítóelemek kerülnek beépítésre. A budapesti atlétikai stadion beruházása keretében megépült Osztószigeti ferdekábeles hídra – vagy elterjedt nevén Robinson hídra – a kivitelező (Hídépítő Zrt.) döntése és a tervező (Speciálterv Építőmérnöki Kft.) támogatása alapján nem kész termék, a piacon elérhető csillapítóelem, hanem egyedi gyártású, saját fejlesztésű csillapítóelem került megtervezésre a Speciálterv Építőmérnöki Kft. és a Budapesti Műszaki és Gazdaságtudományi Egyetem Hidak és Szerkezetek Tanszék együttműködésében. A cikkben a híd bemutatása után ezen csillapítók tervezésének és fejlesztésének folyamatát és specifikumait mutatjuk be. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kövesdi, Balázs Géza AU - Hegyi, Péter AU - Dunai, László AU - Szigeti, Zoltán AU - Gondár, Péter AU - Vad, János AU - Havasi-Tóth, Balázs TI - A sátoraljaújhelyi Nemzeti összetartozás hídja – széldinamikai vizsgálatok JF - MAGYAR TUDOMÁNY J2 - MAGYAR TUDOMÁNY VL - 186 PY - 2025 IS - 4 SP - 735 EP - 743 PG - 9 SN - 0025-0325 DO - 10.1556/2065.186.2025.4.14 UR - https://m2.mtmt.hu/api/publication/36108491 ID - 36108491 AB - Idegenforgalmi vonzerejüknek köszönhetően a nagy fesztávú gyalogoshidak népszerű hídszerkezeti megoldások, amelyek napjainkban egyre nagyobb számban épülnek világszerte. Sátoraljaújhely csatlakozott a nemzetközi trendhez, és a Zemplén Kalandpark fejlesztéséhez kapcsolódóan, a várost ölelő hegyek összeköttetéseként 2024-ben elkészült az önkormányzat által megálmodott 700 m-es, világrekorder támaszközű kötélhíd. Jelen cikkben bemutatjuk a szerkezetet, illetve annak tervezési szempontjait, kiemelt figyelmet szentelve a széldinamikai vizsgálatoknak, amelyekben a kutatás és az ipari alkalmazás szoros kapcsolata valósult meg. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Dunai, László AU - Horváth, László AU - Váczi, Péter TI - Preserving of Historical Buildings in Budapest JF - LECTURE NOTES IN CIVIL ENGINEERING J2 - LECTURE NOTES IN CIVIL ENGINEERING VL - 596 PY - 2025 SP - 100 EP - 108 PG - 9 SN - 2366-2557 DO - 10.1007/978-3-031-87316-4_13 UR - https://m2.mtmt.hu/api/publication/36122563 ID - 36122563 AB - In Budapest, several buildings of historic value have been renovated and refurbished in the last 10 years. Among them two buildings of high historical prestige are presented in the paper: the 159-year-old palace building of the Hungarian Academy of Sciences, which is under renovation, and the Eiffel-designed 152-year-old steel hall of the MÁV Vehicle Repair Plant, which has been refurbished into the Eiffel Art Studios of the Hungarian Opera House. Both buildings were originally designed and built without standards and regulations, using the technical and technological knowledge of the time, and each of them has interesting and unusual technical solutions. The load-bearing structures of the buildings had problems in verifying that they met current standards. The reconstruction works were designed by KÖZTI Architects & Engineers. Scientific and technical support was provided by the Department of Structural Engineering of the BME by expertizing the buildings, adapting the standard loads to the current site and analysing the behaviour of the load-bearing structure by advanced models. The paper describes the buildings, the technologies and scientific methods used in their renovation/refurbishment, which finally ensured the safety of the structure to the current requirements. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025. LA - English DB - MTMT ER - TY - JOUR AU - Király, Krisztián AU - Dunai, László AU - Calado, Luis AU - Kocsis, András Balázs TI - Experimental study on demountable steel-concrete composite beams JF - JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH J2 - J CONSTR STEEL RES VL - 231 PY - 2025 PG - 14 SN - 0143-974X DO - 10.1016/j.jcsr.2025.109582 UR - https://m2.mtmt.hu/api/publication/36122589 ID - 36122589 N1 - The research presented in this paper was conducted through the cooperation of the Budapest University of Technology and Economics, KÉSZ Group, and bim.GROUP Ltd., Hungary. This project has been implemented with the support provided by the Ministry of Culture and Innovation of Hungary from the National Research, Development and Innovation Fund, financed under the EKÖP-24-3-BME-320 funding scheme. The authors gratefully acknowledge the invaluable support and assistance of colleagues from the university and the industrial partners. AB - Demountable steel-concrete composite structures provide a sustainable solution for the construction industry by aligning circular economy principles, promoting reuse, adaptability, and reduced embodied carbon. This research focuses on developing a demountable steel-concrete composite system consisting of steel beams and precast reinforced concrete panels, with demountable shear connectors playing a key role in ensuring structural performance and reusability. An extensive push-out test program was conducted and supported by numerical simulations to evaluate and optimise the performance of these shear connectors. Based on these findings, full-scale beam tests with varying shear connection configurations were performed to investigate the global behaviour and structural performance of the composite beams. This paper presents the development and experimental evaluation of the proposed demountable steel-concrete composite system, with a focus on the effect of the demountable shear connectors and the precast slab arrangement on the global behaviour of the system under full-scale beam testing. The results confirm adequate stiffness, resistance, and ductility, demonstrating the feasibility of the system for industrial applications. The test specimens demonstrated ductile behaviour, characterised by a combination of elastic and plastic responses, with failure predominantly occurring through bolt shear and bending, accompanied by significant beam deflection and panel end slip. The composite beams exhibited elastic behaviour in the serviceability limit state load level, with no plastic deformation or visible damage, demonstrating their potential for dismantling and reassembly. © 2025 LA - English DB - MTMT ER - TY - JOUR AU - Jáger, Bence AU - Pap, Tibor AU - Kövesdi, Balázs Géza AU - Dunai, László TI - Steel-concrete composite corrugated web girders – Experimental study JF - JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH J2 - J CONSTR STEEL RES VL - 235 PY - 2025 PG - 11 SN - 0143-974X DO - 10.1016/j.jcsr.2025.109845 UR - https://m2.mtmt.hu/api/publication/36283284 ID - 36283284 N1 - The presented research program has been financially supported by the Grant MTA-BME Lendület LP2021-06 / 2021 “Theory of new generation steel bridges” program of the Hungarian Academy of Sciences, which is gratefully acknowledged. The project is also supported by the Doctoral Excellence Fellowship Programme (DCEP) is funded by the National Research Development and Innovation Fund of the Ministry of Culture and Innovation and the Budapest University of Technology and Economics. The presented research program is part of the “BridgeBeam” R&D project No. GINOP-2.1.1-15-2015-00659; the financial support is gratefully acknowledged. AB - Corrugated web girders are widely used in buildings and bridges. This paper presents an experimental research program focused on prefabricated steel-concrete composite bridge girders with corrugated steel web. Web is the corrugated steel plate, bottom flange fabricated from steel, and upper flange is a reinforced concrete. The transfer of shear flow between the CW (corrugated web) and the concrete flange is facilitated by two mechanisms: (i) the embedding of the steel corrugated web into the reinforced concrete flange and (ii) the use of transverse rebars that pass through the web openings in the embedded web sections. Prior push-out tests conducted by the authors [1] suggest that this shear connection is likely to ensure complete shear flow transfer. The aim of this research is to investigate the bending and shear behavior, as well as the interaction between bending and shear. The pure bending resistance is primarily influenced by the accordion effect, rendering the contribution of the CW negligible Consequently, the focus of the study is to examine the shear contribution of the upper reinforced concrete flange to the overall shear capacity of the section under varying bending moments. In addition to assessing (i) resistance measurements, the study evaluates (ii) initial stiffness, (iii) failure mechanisms, (iv) collapse modes, and (v) post-buckling strength. Available experimental tests in the literature are quite limited. This paper presents laboratory tests conducted on five specimens subjected to eight different load scenarios. Based on the experimental results, a preliminary design proposal is developed for the bending-shear interaction resistance. LA - English DB - MTMT ER - TY - CHAP AU - Király, Krisztián AU - Dunai, László AU - Kocsis, András Balázs TI - Szétszerelhető öszvérgerendák szerkezeti viselkedése és tervezése T2 - XXIX. Nemzetközi Építéstudományi Konferencia - 29th International Conference on Civil Engineering and Architecture PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) CY - Kolozsvár T3 - Nemzetközi Építéstudományi Konferencia, ISSN 1843-2123 ; 29. PY - 2025 SP - 76 EP - 81 PG - 6 UR - https://m2.mtmt.hu/api/publication/36318165 ID - 36318165 N1 - A kutatás a BME és a KÉSZ Csoport, bim.GROUP Kft. együttműködésében valósult meg. A projektet a Kulturális és Innovációs Minisztérium támogatta a Nemzeti Kutatási, Fejlesztési és Innovációs Alapból az EKÖP-24-3-BME-320 keretében. AB - The aim of this research is to develop a sustainable, demountable steel-concrete composite slab system, consisting of precast reinforced concrete panels and demountable shear connectors. The system promotes the reuse of structural elements and significantly reduces the embodied carbon footprint of buildings. Push-out tests, full-scale beam experiments and numerical simulations confirmed the system’s adequate stiffness, load-bearing capacity and ductility, for which a Eurocode-based design method has been developed. | A kutatás célja egy fenntartható, szétszerelhető acél-vasbeton födémszerkezet kifejlesztése, amely előregyártott vasbeton panelekből és oldható nyírt kapcsolóelemekből tevődik össze. A rendszer elősegíti a szerkezeti elemek újrafelhasználását, valamint az épület beépített karbonlábnyomának jelentős csökkentését. Kinyomókísérletek, gerendakísérletek és numerikus szimulációk igazolták a rendszer megfelelő merevségét, teherbírását és képlékeny alakváltozási képességét, amelyhez Eurocode-alapú méretezési módszert dolgoztunk ki. LA - Hungarian DB - MTMT ER -