About
51
Publications
7,461
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
114
Citations
Citations since 2017
Publications
Publications (51)
This article focuses on the reliability analysis of the plane steel truss under fire conditions. The safety of the structure was estimated by system reliability analysis combined with First Order Reliability Method (FORM). The authors created the C++ code, which enables us to prepare the advanced probabilistic model for bearing capacity in the sele...
Non-destructive Structural Health Monitoring techniques can be incorporated into bridge integrity management by assessing structural conditions. This paper describes a performance assessment of a steel truss railway bridge in Bratislava using vibration-based techniques as a further part of maintenance in addition to standard visual inspections. To...
The idea of determining of structural properties via dynamic test is well known. The main problem is to carry out the demanding dynamic test with appropriate equipment and accuracy. There were performed a relatively wide dynamic experiments in frame of the program of monitoring of structural changes of Austrian highway bridges by repeated dynamic t...
The aim of this paper is to discuss the advantages and the precision of various solution methods of seismic effects. We are focused mainly to the rendering of the torsion effects. The first method is the easiest one and indeed the quasi static method. We used two options of this method. The classic one with determining the quasi static forces and a...
Ceramic curved tile roofs (CCTR) have been used in Spain for ages. This roofing system is very common in Primary Healthcare Centers in Extremadura (Spain). The main objective of this research is to analyze the condition-based maintenance (CBM) of CCTR of Primary Healthcare buildings. Once the condition-based maintenance is analyzed, the optimal mai...
![Fig. 3 Arch bridge over the river Váh near Strečno [5]](publication/355179859/figure/fig4/AS:1078410398961668@1634124483619/Arch-bridge-over-the-river-Vah-near-Strecno-5_Q320.jpg)
![Fig. 4 Model of the truss arch railway bridge near Strečno [5]](publication/355179859/figure/fig5/AS:1078410398969857@1634124483745/Model-of-the-truss-arch-railway-bridge-near-Strecno-5_Q320.jpg)
The paper employs the particle swarm optimization (PSO) method for the identification of damage to a stringer web. This method is inspired by a swarm of bees or flock of birds which look for a common solution. It is a heuristic method, that utilizes a particle as a problem-solving candidate. The location of this particle in the search space represe...
Structural health monitoring is an important research field being investigated around the globe. In recent years, meta-heuristics are being used to solve the complex inverse problem of structural damage assessment. In this work, a novel approach depending on a new meta-heuristic and effective objective function formulation is proposed. Firstly, by...
Introduction
Weather conditions influence urban mobility and alter greenhouse gas emissions. The aim of this paper is to analyse the impact of carbon footprint derived from the use of private vehicles in Extremadura (Spain), focusing on weather-influenced transport to rural healthcare centres. This new understanding will help to improve predictions...
This paper uses a parametric study to evaluate the significance of the rotational components of Earth’s motion in a seismic design. The parametric study is based on the procedures included in Eurocode 8, Part 6. Although the answer to the question of when the effects of rotational components are important is quite a complex one and requires a more...
The effects of non-structural parts to the overall response of the single span steel bridge has been investigated. From comparison of both tuned FEM model and experimental test results it follows that the effect of continuous rail track between adjacent spans has significant influence on both static and dynamic response of the bridge structure. Thi...
Stringers of steel bridges are one of the structural elements most prone to fatigue cracks, corrosion and other types of damage. The regular maintenance and inspection of their condition can ensure longer service life. The paper proposes a performance indicator to track the state of steel stringers employing strain gauge measurements and numerical...
The paper deals with identifying the condition of bearings on a truss bridge with a reinforced concrete bridge deck by means of repeated dynamic tests. Interferometric radar was used to record the dynamic response of the bridge. This device measures the dynamic displacements of several points of the structure simultaneously. In addition to displace...
This paper reports results relevant to the experimental comparison of a number of vibration-based methods for damage localization applied using responses recorded during forced vibration tests on a composite beam. Damage is intended herein as a stiffness change. Four methods from literature were compared: two model-based methods, namely the direct...
Bratislava Harbor Bridge is an important part of Slovak highway and railway network. The authorities of the bridge (Railways of the Slovak Republic and National Motorway Company) cannot afford to close it. In the case of closure, traffic in Bratislava would be paralyzed, as up to 100,000 vehicles pass the bridge daily. Because of that, only dynamic...
The article presents the development of a SHM (Structural Health Monitoring) strategy intended to confirm the improvement of the load-bearing capacity of a bridge over the Ružín Dam using static and dynamic load tests, as well as numerical simulations. The paper comprises measurements of the global response of the bridge to prepare a verified and v...
The use of radar interferometry to measure dynamic response is now increasingly popular. The main advantage is a measurement of displacements. In this way, we obtain direct design parameters. Interferometric radar provides a cost-effective way to monitor bridges based on dynamic displacement measurement without traffic restrictions. The advantages...
The primary aim of this research was to verify accuracy of results of the modal analysis on the composite beam. The research is based on the identification technique, which determines structural characteristics from the measured values of dynamic response. The method uses measured data to optimal update of the stiffness matrix to get numerical mode...
Structural health monitoring (SHM) can provide information needed to make important decisions regarding the maintenance of bridge structures. However, the data collected from monitoring needs to be first translated into actionable, quantitative or qualitative based characteristics, that indicate the condition of a bridge. This paper presents a proc...
The work is devoted to the use of radar interferometry for measurements of the dynamic response of a bridge. Interferometric radar IBIS-S provides financially affordable way of monitoring bridges based on the measurement of dynamic displacements without traffic limitation. The dynamic response of the bridge is assessed on the basis of the dynamic c...
Truss bridges are integral part of the transport network, mainly railroads and partially road bridges. The investigated bridge is located in the western part of Slovakia, and it crosses the Vah River. Density of traffic on the bridge is not so high, so the bridge is accessible for repeating dynamic measurements. Many load situations were simulated....
The aim of the structural health monitoring (SHM) is to provide useful information about the state of the structures. However, the data collected from monitoring needs to be first translated into actionable, quantitative or qualitative based characteristics, that indicate the condition of a bridge. The paper proposes a methodology for comparison of...
Dynamic measurements of two steel truss bridges for Structural Health Monitoring (SHM) were performed. The investigated bridges were: a single supported one span truss bridge and a multi-span truss bridge. Two possibilities of measuring setup were considered. A simple arrangement made up of one polygon has been used for data acquisition of the sing...
This paper deals with dynamic tests of the building with diesel generator and the process of determining the cause of the cracks in its walls. After initial measurements and FEM analysis, it was assumed that vibrations propagate to the structure through the base of the generator. Therefore, it was recommended to apply an elastic antivibration layer...
The main goal of this paper is to find stress after the dynamic loading in the spine. At the beginning, it is necessary to obtain a finite element model of the spine where the stress analysis is performed. Two geometries of pathological curvature of spine are analyzed for better understanding of stress distribution in the spine. The next step is to...
This article deals with a method of how to acquire approximate displacement vibration functions. Input values are discrete, experimentally obtained mode shapes. A new improved approximation method based on the modal vibrations of the deck is derived using the least-squares method. An alternative approach to be employed in this paper is to approxima...
The primary aim of the paper is to present a simple method for determining the changes in stiffness of a composite beam. The experimental model was made from wood and plaster boards. It was simply supported beam with a length of 4 m. Accelerations were measured at 24 points along the beam. In either case data for intact and damaged models were acqu...
The paper deals with a preparation of a complex FEM model for a local damage detection. The initial verified and validated three-dimensional FEM model of a steel truss bridge in laboratory is revised step-by-step to achieve the accurate model according to the experimental model. The emphasis is on modelling of the joints with 4 rivets and modelling...
This paper shows initial dynamic test results to determine the dynamic behavior (natural frequencies and mode-shapes) of a biaxial voided flat slab to verify a FEM model. The field measurements were done at a residential building in Bratislava. The numerical model of slab was made in the FEM code. The natural frequencies and mode-shapes of slabs ob...
Tuned mass damper for high-rise building has been designed. Two numerical models with different detail have been used. The influence and performance of tuned mass damper has been analyzed. Its effects have been checked for both models-simplified and full 3D Finite Element Method model. Alternatively tuned liquid damper has been assumed and its basi...
The article is devoted to a suitable choice of input parameters for the efficient running of a self-developed code used for damage detection. The code was prepared in Office Excel VBA, which used a non-destructive vibration-based method. The primary aim of the code is to determine the change in bending stiffness by using the FE model updating metho...
The primary aim of the article is to analyse impact of appropriate values of input parameter for an effective solution of the self-developed code used for damage detection. The code was prepared to determine the change of bending stiffness in Microsoft Office Excel Visual Basic for Applications. The code used non-destructive vibration based method,...
The paper presents some of the intermediate results obtained in the framework of the research program APVV No. 0236-12 granted by the Slovak Research and Development Agency entitled “Bridge Structural Health Monitoring via Repeated Dynamic Tests”.
The article deals with a part of structural health monitoring (SHM) of in scale model. Investigated experimental model is similar to the bridge situated in the western part of Slovakia. After laboratory tests, the work continued with in-situ monitoring of original bridge. During the first stage of testing only the basic dynamic characteristics - ma...
The paper is dedicated to new innovative test method for determination of shear wave velocity achieved by dynamic test in-situ. Different soil types (e.g. gravel, clay, gravel with sand, limestone) were tested by the simple method. Scattering of shear wave velocities measured in-situ is relatively wide and depends on various local conditions. That...
The Port Bridge across Danube in Bratislava is about 461 m long with 4 spans. The bridge was designed for both a highway and simultaneously for two railway tracks. Nowadays the construction is overloaded and that is why the structural health monitoring of the bridge is being developed. The test setup consists of two measuring polygons. This setup n...
The article deals with structural health monitoring (SHM using non-destructive vibration based method. Modal analysis of a truss beam was prepared in software ANSYS 13.0. The steel truss beam was supported as a cantilever for this experimental measurement. Accelerations of the structure were measured at 22 points (12 points in the horizontal direct...
The paper is devoted to structural health monitoring using a non-destructive method based on the method of direct stiffness determination combined with the model updating method. The primary aim of the paper is to determine the change in bending and torsional stiffnesses. In the first part of the work it was necessary to prepare a simple experiment...
Paper discusses the implementation of sectional analysis in a custom program developed by authors. The program is devoted to nonlinear analysis of reinforced concrete frames. Analysis consists of two interrelated iterative procedures, global frame analysis and sectional analysis. The latter works with the discretized cross section into finite numbe...
The cross-border region between Bratislava and Vienna is one of the fastest growing regions in Europe – especially concerning the high-tech industry (www.contor-analyse.de). One success factor of commercially effective high-tech start-up companies is the early identification of user requirements and selling arguments. The basis for commercial innov...
A planned road bridge in an active seismic zone near the city of Žilina in Slovakia was analysed for seismic effects. The seismic analysis has shown that an inelastic structural response due to a strong earthquake is very likely. Because of these large seismic design forces an increase of foundation dimensions was necessary. An alternative solution...
An industrial heavy structure subjected to seismic action and its response after a few design improvements is presented. The difficulties of modelling of this industrial structure compared with ordinary structures is discussed, especially the effect of free hanged 250 tons of steel pipes used for medium cooling. The effect of long hanger (about 15m...
This paper deals with determination of shear wave velocity in the soil directly in-situ by dynamic tests. Self-developed dynamic excitation impulse device was used in order to excite the soil during the tests. Consequently, accelerations of the soil vibration were measured by portable five-channel measurement equipment. Recorded data were evaluated...
The aim of the work is oriented towards the simulation or modeling of the lumbar and thoracic human spine as a load-bearing 3D system in a computer program (ANSYS). The human spine model includes a determination of the geometry based on X-ray pictures of frontal and lateral projections. For this reason, another computer code, BMPCOORDINATES, was de...
A parametric study concerning the importance of very low seismicity for
Slovakia is introduced. Analyses were performed for ordinary buildings
such as family houses, residential brick buildings, residential panel
buildings and high-rise buildings. Both horizontal wind and seismic
actions were analysed and compared in detail for all the regions and...
Non-linear analysis of steel semi-rigid diagonal-to-column joint is presented in the paper. Investigated joint is a part of a structural system, which was often used in Slovakia. The results from analysis will help with the correct preparation of a test. Evaluation of stiffness and resistance of this joint is the purpose. These parameters are the i...
This paper presents a method to determine soil stiffness properties using measured structural modes of bridges. Normally, the identified mode shapes have to be smoothed. The mode shapes are approximated using functions describing the transverse vibration of distributed-parameter systems. Artificial coefficients are introduced into this solution in...
An understanding of the mechanical response of the lumbar human spine is pertinent to numerous medical problems. Among these are pathogenesis of the lumbar discs-segments degeneration, effects of vertebral arthrodesis, endplate fractures during pilot ejection, effects of the short-time dynamical loadings in special working processes or some types o...
Projects
Project (1)
The attention is focused to the sophisticated monitoring of bridges, which is mainly based on repeated measurements of the dynamic response. In Slovakia at present there is no coordinated system created. The project will lay the basis for monitoring of important bridges. Methodology will be developed for the system identification (SI) and subsequent monitoring (structural health monitoring - SHM) for selected continuous reinforced concrete bridges, steel bridges and some special types of larger span bridges.
The project will use radar tracking (IBIS-S system) and dynamic testing laboratory for the dynamic response tests. Some of the procedures and methods of identification will be verified on scale models in the laboratory. Numerical analyses of structures using the finite element method will be performed and calibrated by the experiment. For typical bridge structures new software will be developed for the evaluation of dynamic experiments and subsequent SHM. A basic database of several bridges will be created along with their initialization measurements for long-term SI. An automated measuring system will be developed for a selected structure.
The project will also serve as a training base and expertise to students, post-graduates and young scientists of technology oriented universities in Slovakia and abroad.
