B. Kövesdi

B. Kövesdi
Budapest University of Technology and Economics · Department of Structural Engineering

PhD

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85
Publications
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747
Citations

Publications

Publications (85)
Article
Current standards and specifications do not provide specific design methods to determine the lateral-torsional buckling (LTB) strength of girders with trapezoidally corrugated web. In the international literature there are some previous investigations available focusing on the LTB strength of corrugated web girders. Based on numerical calculations...
Article
Full-text available
Application of concrete-filled steel tubes (CFST) is becoming increasingly prominent in the civil engineering practice. However , the interaction of cross-sectional elements in CFST columns raises a number of questions, which have to be investigated in detail to improve design background and analytical resistance formulae. The aim of the current pa...
Article
Full-text available
Deformations of bottom flanges in the vicinity of bridge bearings, i.e., in bearing areas, due to manufacturing and loading can result in serious problems in service life and damages in bridge superstructures and structural bearings coming from nonuniform stress distribution. The paper focuses on the out-of-flatness measurement of bearing areas usi...
Article
The current paper studies the global and local interaction behaviour of box-section columns using numerical simulations by creating a numerical model and analysing their buckling resistances to pure compression. The developed numerical model uses a combination of global and local imperfections as well as residual stresses, which are the key paramet...
Article
Longitudinally stiffened plates appear in many structural engineering applications. One of the typical failure modes is induced by the buckling of the stiffeners, therefore enhancing our understanding of buckling behavior is of crucial importance. Recently, buckling resistance of longitudinally stiffened plates with trapezoid stiffeners has been in...
Article
The finite element model-based design of steel structures is getting increasing attention by designers, especially in the case of buckling problems of welded plated structures and by the static check of the interacting stability behaviour. The FEM-based design approach is introduced and standardised in the EN 1993–1-5 Annex C providing the ability...
Chapter
Im Zuge der Entwicklung der zweiten Generation der Eurocodes hat der Eurocode 3 Teil 1-5 „Plattenförmige Bauteile“ eine letzte Fassung erreicht, die nun für die formale Abstimmung in Europa vorbereitet wird. Der Beitrag stellt dazu die Weiterentwicklung des Teils 1-5 von Eurocode 3 vor und macht dessen Anwender mit den wesentlichen strukturellen un...
Article
Full-text available
The accurate consideration of the local (plate) buckling resistance and the determination of the effective width is highly important in the design of civil engineering structures. The current effective width calculation method provided by the EN 1993-1-5 is mainly developed for I-sections subjected to bending. Several previous studies proved that t...
Article
Full-text available
Buckling resistance of longitudinally stiffened plates subjected to compression is a crucial issue in the design of many steel bridges. The design methodology of the current Eurocode describes the behavior as a combination of column-like and plate-like behavior. Previous studies well explored the plate-like behavior of compressed stiffened plates w...
Article
A tanulmány célja, hogy áttekintse a hidak építésének azon körülményeit, amik a saruknál számítás szerint fellépő várható reakcióerőket jelentősen befolyásolhatják, és nem megfelelő kezelésük esetén a saruk és a felszerkezet károsodásához vezethetnek. A szerzők célja, hogy néhány tipikus kialakítás elemzésével felhívják a probléma jelentőségére a s...
Article
Full-text available
The focus of the current paper is the investigation of different local stress calculation methods for fatigue design. To evaluate the accuracy and applicability of the hot-spot and effective notch stress (ENS) fatigue assessment methods an experimental and numerical research program is carried out at the BME Department of Structural Engineering, in...
Article
The objective of this paper is to investigate and compare the fatigue behavior of Normal Strength Steel (NSS) and High Strength Steel (HSS) welded specimens (cruciform and flange gusset joints). Numerous specimens were tested in the framework of the research project. The experimental S-N curves of the test specimens are determined and analyzed by m...
Article
Full-text available
An experimental and numerical research program is executed to investigate the fatigue lifetime increase due to grinding-type post-weld treatment method. Plate edge gusset, longitudinal attachment and T-type joint specimens are investigated using fatigue test results, numerical models and mathematical statistical tools. The favourable impact of grin...
Article
The Széchenyi Chain Bridge is a 170-year-old historical structure located in the downtown of Budapest. The superstructure of the bridge was reconstructed several times in its history and currently the renewal process of the bridge is under consideration. According to the current plans main girders, chain elements and cross-girders will remain the o...
Article
Buckling resistance of longitudinally stiffened orthotropic plates is highly important in the design of steel bridges. The current calculation method of Part 1.5 of Eurocode 3 is based on the concept that the behaviour can be superposed from plate-like and column-like behaviours. Recent results indicate uncertainties in the application of the curre...
Article
Full-text available
Traditionally in steel‐concrete composite bridges, the structural elements with different materials are work together with headed stud shear connectors welded to the top flange of the steel beam. The application of trapezoidal corrugated web embedded in the concrete slab provides an alternative for steel‐concrete composite and hybrid structures, ho...
Article
It is commonly known that compression resistance of longitudinally stiffened orthotropic plates depends on both the column and plate-like behavior. Large number of previous investigations studied the structural behavior of stiffened plates subjected to compression. However, a comprehensive investigation and a parametric study is not available in th...
Conference Paper
Full-text available
The most sufficient welding parameters and settings of manufacturing technologies are currently mainly determined by experiments for standardised production in the practice. It is a time-consuming method, while there is a large amount of waste during the 'trial and error' process of distinct welding technologies. Virtual fabrication and virtual tes...
Article
Full-text available
Generally, optimum welding variables and conditions of manufacturing are currently mainly determined by experiments for standardized production. Virtual manufacturing and virtual testing of weldments using finite element method provide a sustainable solution for advanced applications. The aim of the current research work is to develop a weld proces...
Article
Steel I-girders with slender web are commonly used in the engineering practice. Previous research results proved that the current bending and shear interaction (M-V) check of the EN1993-1-5 does not always provide safe side resistance. The current research work focuses on the analysis of the M-V interaction behavior of longitudinally unstiffened an...
Article
Residual stresses and initial geometric imperfections have important effect on the buckling resistance of slender plated steel structures. Despite their large importance, the actual knowledge on residual stresses and exact geometric imperfections are limited, especially for corrugated web girders. In the accompanying paper [1] (Part 1) a finite ele...
Article
Plate buckling resistance calculation of orthotropic plates and the determination of the effective width is highly important in the design of bridges. The current effective width calculation method provided by the EN 1993-1-5 [1] is developed for I-sections subjected to bending. Previous research results proved that the application of the plate buc...
Article
Steel I-girders with corrugated webs have been widely used in the past decades, especially in bridges. Although, there are several specialities in their structural behaviour which needs further investigation. Buckling resistance of slender structures is sensitive to imperfections due to residual stresses and initial geometric imperfections. Shear b...
Conference Paper
Current standards and specifications do not provide design methods to determine the lateral-torsional buckling (LTB) strength of girders with trapezoidally corrugated web. In the international literature there is only a limited number of previous investigations available focusing on the LTB strength of corrugated web girders. Based on numerical cal...
Article
de Dedicated to Univ.‐Prof. Dr.‐Ing. habil. Frank Werner on his 70th birthday Zusammenarbeit zwischen Weimar und Budapest bei der rechnergestützten Modellierung von Stahl‐ und Verbundkonstruktionen Der Beitrag gibt einen Überblick über die langjährige Zusammenarbeit zwischen der Bauhaus‐Universität Weimar und der Budapester Universität für Technik...
Conference Paper
Full-text available
Steel corrugated web girders are increasingly used in buildings, industrial halls and bridges due to their well-known advantages. Numerous researchers highlighted and studied the advantages and favorable properties of the trapezoidally corrugated web girders in the past. However, there are only a limited number of available design proposals for the...
Article
Bridges with box cross-sections are usually stiffened by the combination of longitudinal and transverse stiffeners. The longitudinal stiffeners are loaded by axial force, and the transverse stiffeners should give sufficient support to them. The design of transverse stiffeners without direct loading can be done by the verification of the minimum sti...
Conference Paper
Full-text available
Application of steel I-girders with corrugated webs has been significantly increased in the past decades, especially in bridges. However, there are numerous unknown specialties in their structural behaviour compared to conventional I-girders with flat webs, which needs further investigations. Previously, a large number of test results and numerical...
Conference Paper
Hybrid girders with corrugated web are increasingly used in bridge engineering due to its numerous favorable properties. For the web-to-slab connection different layouts have been developed in the past, however, just a few design proposals can be found in the international literature for the determination of the connection’s resistance, especially...
Article
The statistical evaluation of the experimental and numerical results is an essential task in case of resistance model development for civil engineering structures. If a design model is developed which has analytical or empirical background, its safety level has to be confirmed and it should be proved that the developed design method fits the safety...
Article
Steel I-girders with longitudinally stiffened webs are commonly used in the civil engineering praxis, especially in bridges. These structures have usually longitudinal stiffeners on the webs, therefore the determination of the load carrying capacity of girders with longitudinally stiffened webs under the combined loading situation (interaction of b...
Article
According to the previous research results the effect of residual stresses on the high strength steel members (HSS–S500 and higher steel grades) are less severe than for normal strength steel (NSS –steel grades of S235–S460) structures. Residual stresses have a significant influence on the global stability behaviour of steel structures, therefore t...
Article
Previous studies proved that the patch loading resistance model of the EN1993-1-5 can lead to significant underestimation of the patch loading resistance in case of longitudinally stiffened girders. Recently there are several research activities to improve the design method. In the current study experimental research program is executed on 8 large...
Article
The accurate consideration of the flexural buckling resistance of high strength steel (HSS) structures is highly important in the design. Higher yield strength indicates the applicability of smaller cross-sections, which might be more sensitive for stability problems. The purpose of the current study is (1) to investigate the flexural buckling beha...
Article
It is commonly known that the patch loading resistance model of the EN1993-1-5 has a relative large scatter, and it can lead to significant underestimation of the patch loading resistance in case of slender plate girders with longitudinal stiffeners. Large number of previous investigations studied the structural behavior of the stiffened girders su...
Article
The accurate and economical consideration of the flexural buckling resistance of high strength steel (HSS) structures is highly important in the design. According to the previous research results the flexural buckling behaviour of HSS and NSS columns can be significantly different, which differences are not considered in the current design rules. T...
Article
The exact consideration of the global buckling behaviour of HSS steel structures is very important in the design because due to the higher yield strength smaller cross sections can be used, which might be more sensitive to stability failure. According to the previous research results, the flexural buckling behaviour of HSS and NSS columns can be si...
Article
The 130 years old Eiffel-hall in Budapest is a single-story historical steel building which function was a workshop for locomotives till 2009. The hall with a 95×235 m floor area is built up from 20 truss frames having 5 modules for each. In 2016 the change of the function of the hall was requested, and the workshop and rehearsal centrum of the Hun...
Article
There are contradictional information in the previous studies regarding the relationship between the fatigue strength and the yield strength in case of steel structures. Several previous test result show that the fatigue strength of as-welded specimens do not depend on the yield strength of the base material. However, several studies show that the...
Article
Full scale tests on eight steel‐concrete composite beams have been executed in the Structural Laboratory of the Department of Structural Engineering, Budapest University of Technology and Economics in Hungary. The aim of the test series was to investigate the structural behavior of the new and innovative shear connections applied at the steel‐concr...
Article
The residual stress in steel structural elements has significant influence on the flexural buckling behaviour of compressed members. This phenomenon causes that hot‐rolled, cold‐formed and welded sections with the same geometry have different flexural buckling behaviour and resistance. Previous research results showed that the residual stress patte...
Article
The superstructure of the historical Széchenyi chain bridge in Budapest was reconstructed several times in the history and currently the renewal of the bridge is under design. The independent static check and expertizing tasks of the renewal process were completed by the Budapest University of Technology and Economics Department of Structural Engin...
Article
Girders with trapezoidally corrugated web are widely used structural elements in the civil engineering praxis due to their numerous advantages. However, there is a relatively small number of previous investigations focusing on the determination of the flange buckling resistance of the corrugated web girders. Previous experimental and numerical inve...
Article
Previous research has shown that the residual stresses in high-strength steel (HSS) members can be smaller than those in normal-strength steel structures. To investigate the residual stress distribution in HSS structures, a complex experimental and numerical research programme was carried out on welded square box sections at the Budapest University...
Article
Girders with trapezoidally corrugated web are widely used structural elements in the civil engineering praxis due to their numerous advantages. Despite, there are a relatively small number of previous investigations focusing on the determination of the bending moment resistance and the flange buckling behavior. Previous experimental and numerical i...
Article
Application of the corrugated web girders has been widely spread due to their numerous advantages in the field of bridges and buildings in the civil engineering praxis. This girder type has a special stress distribution and buckling behavior compared to conventional steel I-girders. Despite, there are a relative small number of previous investigati...
Article
Full-text available
Nowadays the barrier of applying HSS (High Strength Steel) material in bridge structures is their low fatigue strength related to yield strength. This paper focuses on the fatigue behaviour of a structural details (a gusset plate connection) made from NSS and HSS material, which is frequently used in bridges in Hungary. An experimental research pro...
Article
Longitudinally unstiffened steel I-girders are commonly used structural elements in the engineering practice. Previous research results proved that the current design method of the EN1993-1-5 EN 1993-1-5 (2005) for M-V interaction check is not always on the safe side for longitudinally stiffened girders, however a systematic review of the M-V inter...
Article
Steel corrugated webs are likely used in the field of bridges in the last few decades due to their numerous advantages. The most favorable layout is the hybrid girder with upper and lower reinforced concrete slabs and with steel corrugated webs. During incremental launching – without concrete flanges – the steel girder can be subjected by the combi...
Article
The application range of the current EN 1993-1-1 [1] for column buckling resistance determination is limited for steel materials up to the steel grade of S460. The EN 1993-1-12 [2] gives design rules for materials up to steel grade of S700. The stability failure of HSS steel structures is very important in the design, because due to the higher yiel...
Article
According to the previous research results the effect of residual stresses on the high strength steel members (HSS) are less severe than for normal strength steel (NSS) structures. Residual stresses have a significant influence on the global stability behaviour of steel structures, therefore the application of the existing buckling curves developed...
Article
Full-text available
The authors had the opportunity to contribute in the erection process of the „Čadečka” highway bridge between September 2014 and June 2015. The tasks of the authors were to design and execute the launching process of the steel main girders together with the design of the launching technology and the static check of the superstructure in each launch...
Article
Full-text available
The new Hárosi Danube bridge on the M0 highway around Budapest has been designed and erected between 2010-2012. The superstructure of the bridge is a continuous steel box girder with 3 spans (3 x 108.5 m). The independent static check in the final stage and during the launching phases are made by the BME Department of Structural Engineering. The cu...
Article
Full-text available
In frame of the tramway network development in Budapest a new tramway line has been established on the south part of Budapest, which crosses the Danube on the Rákóczi-bridge. The bridge superstructure is a continuous double-cell steel box girder having 6 spans with the largest span of 98.52 m. The bridge was originally designed to carry four traffi...
Conference Paper
Full-text available
Steel girders with trapezoidally corrugated webs are increasingly used in the field of bridges, especially in case of hybrid and composite bridges. During incremental launching of the bridge the main girders are subjected to bending moment (M) with accompanying shear (V) and transverse forces (F) in the same cross-section, which can result in a cou...
Conference Paper
Full-text available
Welding processes belong to the most important and widely used methods creating connections in the steel industry. All the information about a welded specimen's shape and residual stresses are especially important to improve the production quality and to determine the resistance of steel members. The welding process results in microstructural chang...
Article
Girders with corrugated steel web is likely used in bridges as well as in building structures due to its numerous favourable properties. It is known from previous investigations that due to the web corrugation the normal and shear stress distribution in the flange and web plates of the corrugated web girders are different from the stress distributi...
Article
Full-text available
Numerical simulations make the improvement of fabrication process and welding technology. Numerical simulations make the improvement of fabrication process and welding technology possible. Using finite element method the most important information about welded specimens can be determined such as deformed shape, residual stresses or even microstruct...
Technical Report
Full-text available
Both industry and architects are interested in increasingly wide spanned and slender structures, raising the demand in high yield stress resistance of steel structures to save weight and finally costs. Several manufactures are able to provide steel grades even higher than S1100, but the rapid development of the production outpaced the present desig...
Article
Full-text available
During the last decades orthotropic steel decks have become a widely used component of steel bridges, however high numbers of fatigue cracks have been recently detected in these structure types. It is well known, that the orthotropic decks are sensitive to fatigue damage, therefore safe fatigue design is important for the safety assessment of bridg...
Article
Steel girders with corrugated webs are increasingly used in the field of bridges, especially in case of composite bridges. During launching of a bridge structure the girder can be subjected by the combination of bending moment (M), shear (V) and transverse forces (F) which result in a complex stress field in the girder and in an interacting stabili...
Conference Paper
Full-text available
Welding processes belong to the most important and widely used methods creating connections in the steel industry. All the information about a welded specimen's shape and residual stresses are especially important in improving the production quality and to determine the resistance of the steel structures. The welding process results in microstructu...
Chapter
Dieses Kapitel beschreibt die Stabilitatsnachweise nach EN 1993-1-5. Die EN 1993-1-5 stellt unterschiedliche Methoden zur Berücksichtigung des Plattenbeulens zur Verfügung. Die bis hier angeführten Berechnungsmethoden werden theoretisch aufbereitet und die jeweilige Nachweisführung bzw. der jeweilige Rechengang wird anschließend anhand von Beispiel...
Article
During launching of a bridge structure large bending moment, shear and transverse forces can often occur at the same time in the same cross section which can result in governing situations for the design. In case of these structures the interacting stability behaviour should be taken into consideration. Bridge structures have usually longitudinal s...
Article
If steel structures are subjected to the combination of bending, shear and patch loading, the interacting stability behaviour in the design should be taken into consideration. The combined loading situation can often occur in case of bridge girders during launching, therefore the determination of the load carrying capacity under the combined loadin...
Article
Corrugated steel plate has been increasingly used in the last 20 years for beam webs in hybrid and composite bridges. Girders with corrugated webs have many advantages over traditional structures with flat webs, but due to the new structural layout, there are still many design questions that need to be solved. In cases with girders with trapezoidal...
Article
In this paper, the behavior of deep trapezoidal sheeting with perforated webs is studied. The analyzed panel has longitudinal stiffeners both in the webs and flanges, which improves the load-bearing capacity but makes the behavior more complicated. The considered panel is produced with and without web perforations. When web perforation is applied,...
Chapter
In case of steel beam-to-column joints the bending resistance is significantly influenced by the shear strength of the web panel. The compression side resistance of the joint is limited by the web panel in shear component and in case of special geometries it can give a relatively strong limitation for the bending resistance of the whole joint. In t...
Article
The corrugated steel plate is a widely used structural element in many fields of application because of its numerous favorable properties. Due to the web corrugation the normal and shear stress distribution in the flange and web plates are different from the stress distribution of the conventional I-girders under in-plane bending and shear. The foc...
Article
Due to its advantages corrugated steel plates are widely used in various applications. Engineers realized a potential application field in bridges, especially in composite bridges. When such a bridge is incrementally launched, the girder is subjected to combined action of bending moment, shear and transverse forces, resulting in a complex stress fi...
Article
The corrugated steel plate is a widely used structural element in many fields because of its many favourable properties. This structural layout has spread in the field of bridges, too, especially for steel and composite bridges. Against of the numerous applications there are no standard design formulas for the patch loading resistance of girders wi...
Article
The corrugated steel plate is a widely used structural element in many fields of application because of its favourable properties and has been applied since the 1920s. For the last 20 years it has been increasingly used in the web of steel and composite bridges. When such a bridge is incrementally launched, buckling of the thin steel web may occur....
Article
Full-text available
The corrugated steel plate has been increasingly used as web of steel and composite bridges. When such a bridge is incrementally launched, the web panels are often subjected to combined shear and patch loading. There are only a few investigations available in the literature which are dealing with this interaction type, therefore the current researc...

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