László Gergely Vigh

László Gergely Vigh
Budapest University of Technology and Economics · Department of Structural Engineering

PhD

About

90
Publications
33,280
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372
Citations

Publications

Publications (90)
Method
This file is an example of the application of the proposed design calculation - modeling of the NiTi SMA-based connection which is part of the Ph.D. dissertation.
Article
Safety and security of critical infrastructure networks is one of today’s top priorities, as they are getting increasingly complex and interdependent. Thus, their potential failure due to unforeseen and extreme events may result in excessive direct and indirect losses. Recently, focus has shifted from protection to resilience, i.e. the ability of a...
Article
This study evaluated the performance of smart steel moment-resisting frame structures (MRFs) equipped with nickle titanium shape-memory alloy (NiTi SMA) connection systems subjected to blast overpressure. A total of five NiTi SMA–based connections were designed conforming to current European standards, and their numerical models were developed. To...
Article
The generated damages in steel structures due to terrorist attack explosion has attracted structural engineering communities, because the effect of blast loading is extremely sever and destructive. The behavior of Superelastic Nickle Titanium Shape Memory Alloy (NiTi SMA) beam-column connection was infrequently studied under the effect of blast loa...
Article
This paper deterministically evaluates the blast performance of steel moment-resisting frame (MRF) smart structures equipped with nickel titanium shape-memory alloy (NiTi SMA) bolted connections. The recentering capacity of the NiTi SMA bolts is exploited to limit the structural damage and reduce the residual drift after a near-field explosion even...
Article
Full-text available
This paper studies the effects of the 1763 Komárom earthquake (Hungarian Kingdom) by analysing historical building archetypes using both Nonlinear Static Analysis (NSA)—the EC8 N2-method—and Incremental Dynamic Analysis (IDA). Hungary is located in the Carpathian Basin, a region with a regular low-to-moderate seismicity and a relatively small occur...
Conference Paper
The fabrication process of a steel structural member fundamentally determines its imperfections. The accuracy of cutting, the spring-back during cold forming, and the specification of welding procedure leads to residual stresses and distortions. In design according to the Eurocodes, engineer can use the equivalent geometric imperfections in geometr...
Conference Paper
Full-text available
Structures subjected to extreme loadings events such as earthquake or external blast loadings are often designed to utilize nonlinear performance. The design and assessment of the behavior of such structures – although simplified design methods are often available – requires nonlinear static or dynamic analysis. This paper aims at illustrating the...
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
The probabilistic estimation of the magnitude of historical earthquakes requires the analysis of actual building structures affected by those earthquakes. The analysis complicates because most of these buildings no longer exist or were greatly modified, present a great variety of features and the number of analysis for probabilistic assessment is h...
Article
The probabilistic estimation of the magnitude of historical earthquakes requires the analysis of actual building structures affected by those earthquakes. The analysis complicates because most of these buildings no longer exist or were greatly modified, present a great variety of features and the number of analysis for probabilistic assessment is h...
Article
Full-text available
The production of fragility functions describing the probable behaviour and damage on historical buildings is a key step in a method for the estimation of the magnitude of historical seismic events that uses a Bayes'. The fragilities are estimated by integrating the structural capacity with the seismic demand using either static methods, as the Cap...
Article
The production of fragility functions describing the probable behaviour and damage on historical buildings is a key step in a method for the estimation of the magnitude of historical seismic events that uses a Bayes'. The fragilities are estimated by integrating the structural capacity with the seismic demand using either static methods, as the Cap...
Article
Ductile design of steel structures subjected to seismic effects requires creation of dissipative zones. In case of moment resisting frames and eccentrically braced frames, in order to achieve high ductility this requirement often yields to the application of compact sections in the dissipative zone, otherwise premature local plate buckling will gov...
Article
During the application of advanced design procedures (e.g. performance based design) engineers may need to compute the actual risk of the structures. The fragility of structures exposed to seismic effects is often characterized by the fragility curves that show the failure (or collapse) probability under an earthquake characterized by a given inten...
Article
Full-text available
Buckling Restrained Braces (BRB) are innovative displacement dependent devices having balanced hysteretic behavior. Frames equipped with such devices are known as Buckling Restrained Braced Frames (BRBF). Application of BRB elements in Europe is seriously limited by the lack of a standardized European design procedure for BRBF. In the first part of...
Article
Full-text available
Buckling Restrained Braces (BRB) are innovative displacement dependent devices having balanced hysteretic behavior. Frames equipped with such devices are known as Buckling Restrained Braced Frames (BRBF). Application of BRB elements in Europe is seriously limited by the lack of a standardized European design procedure for BRBF. In the first part of...
Conference Paper
The development of structural archetypes for dynamic structural analysis is a current trend in seismic risk assessment and damage scenarios for urban environments. These processes usually rely on probabilistic seismic hazard analysis (PSHA) to select the ground motions for incremental dynamic or multiple stripes analysis in order to attain building...
Conference Paper
The development of structural archetypes for dynamic structural analysis is a current trend in seismic risk assessment and damage scenarios for urban environments. These processes usually rely on probabilistic seismic hazard analysis (PSHA) to select the ground motions for incremental dynamic or multiple stripes analysis in order to attain building...
Article
Full-text available
The application of buckling restrained braced frames is hindered in Europe by the absence of a standardized design procedure in Eurocode 8, the European seismic design standard. The presented research aims to develop a robust design procedure for buckling restrained braced frames. A design procedure is proposed by the authors. Its performance has b...
Conference Paper
Full-text available
The present paper concerns about the historical seismic damage records of the 1763 Komárom earthquake regarding a method for the estimation of the magnitude of historical earthquakes that uses the damage in real structures. To carry out this study, the wall panels of a general masonry building archetype are modelled as a planar SDOF system calibrat...
Article
The development of new and valuable conceptual design concepts based on structural optimization results is the global aim of the presented research in order to assist the industry in economical fire design of steel tapered portal frames. In order to find optimal configurations regarding the life cycle of the structure, a complex, reliability based...
Article
Full-text available
Prior to modern seismic codes, several road bridges were not designed for earthquakes in many moderate seismic regions. The seismic performance of these bridges is questionable. A portfolio of 30 non-seismically designed bridges is compiled for seismic reliability assessment. Fragility analysis is conducted, and the reliability of each structure is...
Poster
To deal with increasing interdependency among critical infrastructures and new types of hazards emerging, the H2020-funded project IMPROVER has developed a harmonized approach for resilience management has been developed. This resilience management framework will give operators an understanding of, and capability to improve, their own resilience, a...
Article
Full-text available
Prior to modern seismic provisions, several bridges were not designed for seismic actions in moderate seismic areas. Precast multi-girder and slab bridges are typical highway overpass structures; they have a significant contribution to national bridge stocks. Since the seismic behavior is questionable, a preliminary parametric study is conducted to...
Conference Paper
Full-text available
Pannonian Basin can be characterized as a moderate seismic region. One of the biggest known earthquakes in Hungary, which is located in the inner part of Pannonian Basin, occurred in Komárom in the 28 th June of 1763. As result 91% buildings in Komárom were affected revealing damage states between light damage and total collapse. Surrounding cities...
Article
Compared to commonly applied methods, a better estimation of probable intensities of historical seismic events can be achieved by probabilistic seismic analysis of structures damage due to seismic events. The method usually requires analysing historical data on the damage of several structures and their behaviour, in order to evaluate and identify...
Conference Paper
Full-text available
Buckling Restrained Braced Frames (BRBF) are concentrically braced steel frames with Buckling Restrained Braces (BRB) in their diagonals. BRBs are special displacement dependent anti-seismic devices. Buckling of the internal steel core of a BRB is prevented by the continuous lateral support of its casing. This configuration ensures balanced hystere...
Article
Numerous recent studies have pointed out that in case of extreme effects (such as fire or seismic effects) the reliability level of structures is lower than in case of conventional effects. Proper estimation of reliability in fire design situation is complicated since there is no comprehensive methodology defined for it; and the commonly used metho...
Presentation
Full-text available
The probabilistic estimation of historical earthquakes magnitude using fragility functions, alike the risk analysis of historical city centres, requires either the dynamic structural or the static pushover analysis of buildings, or Archetypes, characterizing the environment affected by those earthquakes. As most of these buildings no longer exist,...
Article
Full-text available
In lack of seismic provisions in the pre-Eurocode ages, most of the existing Hungarian bridges were not designed for seismic actions, therefore their seismic performance is questionable. The most commonly used structural type in highway construction is the integral precast multi-girder bridge. These bridges are typically constructed as continuous m...
Article
The estimation of fragility functions associated with dynamic structural analysis provide the probability of a certain damage state given an intensity measure. The present paper discusses this technique regarding its application to a method to estimate the magnitude of historical seismic events relying on the behavior and damage in real historical...
Article
The paper focuses on overall and local web plate buckling of longitudinally multi-stiffened aluminium plate girders subjected to compression, bending, shear and transverse loading. The authors completed wide-range bifurcation stability analysis by energy method. Based on the results of the completed parametric study, buckling coefficients are formu...
Article
The City Council of Alma, Quebec, Canada intends to erect a new footbridge celebrating the 150-year anniversary of the city. Functioning as communal and cultural ground, an island will be built on the 100 m wide River Petite Décharge hosting a pedestrian area with pathways plants and artistic installations, being a symbolic landmark. The bridge has...
Article
Full-text available
In this study, the optimum reliability of a tapered steel portal frame structure is presented for several cases. The aim of the research is to define target reliability indices for fire design situation since some research works (Balogh and Vigh, 2015a; 2015b) pointed that the achievable reliability (with using the prescriptive rules of Eurocode st...
Article
Full-text available
The current structural design provisions are prevalently based on experience and on the assumption of stationary meteorological conditions. However, the observations of past decades and advanced climate models show that this assumption is debatable. Therefore, this paper examines the historical long-term trends in ground snow load maxima, and their...
Article
Full-text available
Climate change affects not only the natural but also the built environment. The latter comprises large part of societal wealth, and it is a crucial component of developed economies. The focus of this paper is the quantitative assessment of the reliability of load bearing structures in changing climate. Despite its significance, relatively few quant...
Chapter
Full-text available
Szerkezetek megbízhatósági analízise során az élettartamra vonatkoztatott tönkremeneteli valószínűséget gyakran a sérülékenységi-veszélyeztetettségi görbe módszerével határozzuk meg. A cikkben példákon keresztül illusztráljuk a módszer alkalmazását, a sérülékenységi és veszélyeztetettségi görbék előállításának módját extrém hatásoknak (tűz, földren...
Presentation
Full-text available
Tartószerkezetek földrengésre adott válaszának numerikus vizsgálata esetében kiemelt fontosságú a nemlineáris ciklikus képlékeny viselkedést kezelő numerikus anyagmodell pontossága és hatékonysága. Az utóbbi szempontot szem előtt tartva váltak népszerűvé a kizárólag egytengelyű feszültségállapotot kezelő fenomenológiai anyagmodellek. Megfelelő anya...
Article
Full-text available
In this study, seismic performance of the existing M0 Háros Highway Bridge in Hungary is evaluated. The large-span bridge is designed with minimal consideration of seismic actions, seismic resistance of certain piers, bearings and pile foundations is not adequate. Eight different demand mitigation methods are evaluated considering quasi-elastic con...
Conference Paper
Full-text available
Compared to commonly applied methods, a better estimation of probable intensities of historical seismic events can be achieved by probabilistic seismic analysis of structures damage due to seismic events. The method usually requires analysing historical data on the damage and behavior of several structures, in order to evaluate and identify critica...
Conference Paper
Full-text available
This paper examines the reliability level of the Eurocode’s partial factor design (PFD) method for steel frames subjected to snow load. This is motivated by the frequent damage and collapse of structures under heavy snowfall [1, 2]. We present a general approach which can help to comprehensively investigate the compliance of current Eurocode partia...
Article
Full-text available
The majority of continuous girder bridges in regions of moderate seismicity were designed before the introduction of modern seismic codes that prescribe seismic design verification for such structures. The objective of this study is to investigate the seismic performance of typical Hungarian continuous girder bridges through a parametric study. A d...
Article
A new cold-formed steel corrugated shear wall seismic force resisting system has been recently developed by Tipping Mar and Associates of Berkeley, California. The seismic performance quantification of buildings with the system requires non-linear dynamic analysis, where the shear wall – to reduce calculation demands – is modeled by cyclic strut el...
Conference Paper
Full-text available
The aim of the current project is to get background information on glass failure in order to develop better procedures for design and construction of buildings with glass as a structural material. The project contains several steps: 1) collecting failure cases from literature focusing on: type of errors, failure components, failure modes, consequen...
Chapter
Full-text available
The aim of the current project is to get background information on glass failure in order to develop better procedures for design and construction of buildings with glass as a structural material. The project contains several steps: 1) collecting failure cases from literature focusing on: type of errors, failure components, failure modes, consequen...
Article
A new approach to develop seismic response factors for the design of structural systems has recently been developed by the Applied Technology Council and published in the FEMA P-695 document. The FEMA P-695 assessment methodology provides a comprehensive and objective approach to evaluate the performance factors based on non-linear structural analy...
Article
Eurocode 8 Part 1 provides criteria on the story drift ratio to limit the damage due to frequent seismic event. Although the regulation is simple, its practical applicability is impeded in lack of standard definition for classification of non-structural elements, including glass facades as well. The paper illustrates the behaviour and damage analys...
Article
Full-text available
The EN 15129 standard specifies the requirements for anti-seismic devices in Europe. The nonlinear displacement dependent device (NLD) group collects solutions that typically use the nonlinear properties of their material to dissipate energy and mitigate seismic damage. EN 15129 controls the cyclic hardening behavior of NLDs with a set of stringent...
Article
The paper discusses the experimental fatigue assessment of a recently developed aluminium bridge deck system utilizing Friction Stir Welded (FSW) elements. The FSW effect on the material and the fatigue behaviour is studied. Critical region of the butt weld detail is defined and the mechanical properties are determined by tensile test. Severity and...
Article
In this paper, a solution of six-order differential equation for steel plate strengthened with CFRP plates under uni-axial loading, high-precision solution, is given. In the previous paper, second-order and forth-order differential equations for steel-CFRP system were approximately solved to give the stress distribution. By the comparison of high-p...
Article
Eurocode requires seismic analysis and design of bridges. Based on our design and research experiences, it is confirmed that design of Hungarian bridges may be often governed by seismic effects. In this paper, various methodologies to assure safety against seismic events are illustrated through three case studies. First, application of advanced num...
Article
Full-text available
Introduction of the Eurocode 8 seismic design standard made earthquake resistant structural design obligatory in Hungary. Recent geophysical research concurrently led to significant increase in design peak ground acceleration values. Design of certain bridge structural members (e.g. bearings and surrounding structural details) is often governed by...
Conference Paper
Full-text available
This paper proposes a modification to the typical assessment methods based on Incremental Dynamic Analysis (IDA). Conventional IDA-based performance evaluation of structures uses a pre-defined set of ground motions and scales them to gradually increasing levels to represent different magnitudes of seismic intensity. The proposed methodology conside...
Article
In case of hot-rolled or extruded profiles, the fillet corner shaping of the flange-to-web connection may highly increase the transverse load resistance. Real test illustrates the proneness of compact aluminium profiles to web crippling and the influence of the curved corner. Numerical model is developed and validated by the real test. Invoking non...
Article
The study deals with the mechanical behaviour of laterally loaded structural glass laminated with polyvinyl butyral (PVB) interlayer. To evaluate the influence of the mechanical behaviour of PVB in structural glass plates, a finite element model was developed. The numerical model was verified on the basis of the results from the literature and by o...
Article
Full-text available
The Buckling Restrained Brace (BRB) is an anti-seismic device with substantial energy dissipation capability that stems from the advantageous nonlinear behavior of its steel material. The central steel core of the brace is surrounded by a concrete casing. The casing provides continuous lateral support to the slender core and prevents it from buckli...
Article
The study deals with the mechanical behaviour of laterally loaded structural glass laminated with polyvinyl butyral (PVB) interlayer. To evaluate the influence of the mechanical behaviour of PVB in structural glass plates, a finite element model was developed. The numerical model was verified on the basis of the results from the literature and by o...
Conference Paper
Buckling Restrained Braced Frames (BRBF) are already popular solutions as primary lateral load resisting system in earthquake prone regions of North America and Japan. Although their superior seismic performance has been verified in these areas, regulations regarding their design and verification are not included in current European Standards. Thi...
Article
2010-ben készült el a nemzetközi viszonylatban is különlegesnek számító, szolnoki gyalogos-kerékpáros Tisza-híd: a Tiszavirág híd, amelynek átfogó statikai és dinamikai próbaterhelési vizsgálatait a BME Hidak és Szerkezetek Tanszék végezte el. Tekintettel a fesztávra, a speciális ív- és pályaszerkezetre, függesztő rudakra, a híd karcsúságára, már a...
Article
Full-text available
Because of its superior seismic performance, Buckling Restrained Braced Frame (BRBF) is already popular solution as primary lateral force resisting system in the United States. This paper first introduces the development and concept of BRBF and characterizes the structural performance with special respect to hysteretic behavior. System benefits tha...
Article
A new approach to develop seismic response factors for the design of structural systems has recently been developed by the Applied Technology Council and published in the FEMA P-695 document. The FEMA P-695 assessment methodology provides a comprehensive and objective approach to evaluate the performance factors based on non-linear structural analy...
Article
Recently, design against earthquake events gains significant importance in Hungary. The authors completed independent earthquake resistant design of two Hungarian Danube bridges that are under construction. Our experiences are discussed in this paper.The analysis is in accordance with the European standard Eurocode 8. The paper briefly summarizes t...
Article
New aluminum stiffened girder and its design criterion are proposed. So far, aluminum stiffened girders have been built by the design and building way of steel girders, that is, by fillet welding of some plates (web, flange, stiffener). But, that conventional aluminum stiffened girders have problems of the strength degradation and deformation aroun...
Article
In the paper, research results on a special joint of a new type of steel cooling tower are presented. The structural members are tubular elements with high radius-to-thickness ratios. The 3D jointing and the bolted connections result in extremely complex joints that should be studied by experiments and advanced analysis.This paper focuses on the nu...