National Repository of Grey Literature 43 records found  beginprevious27 - 36next  jump to record: Search took 0.01 seconds. 
Nondestructive methods for detection of hidden fatigue crack in the steel bridge element
Valach, Jaroslav ; Frýba, Ladislav ; Jandejsek, Ivan ; Lesák, Jaroslav ; Vála, Ondřej ; Urushadze, Shota
In this paper we discuss applicability and usability of three non-destructive methods for investigation of fatigue crack propagation in railway bridge structural elements subjected to the repetitive loading. These methods are: an optical method based on the digital image correlation, the active thermography method and the classical x-ray radiographic method.
Experimentální studie dynamiky chůze ve vertikálním a horizontálním směru
Pirner, Miroš ; Urushadze, Shota
The authors have noticed the newest observations and few analysis of excitation mechanism. They suppose that the import knowledge of the forces frequencies of step or strides for different walking velocities is the most important for the further analysis and analysis of the mechanisms. The authors received the vertical force dependence on the walking velocity, on stride length and on the weight of pedestrian. The new research step is focused onlateral horizontal forces.
Výzkum vyztužení karbonovými vlákny ocelových elementů
Frýba, Ladislav ; Pirner, Miroš ; Urushadze, Shota
Carbon fibre reinforced composites represent a new structural element which could increase the strength and stiffness of steel plates. Static and dynamic tests including fatigue loads. Application on steel bridges with orthotropic decks.
Basic information serving to developed qualitatively new codes corresponding to probabilistic assessment exposed to dynamic loaded structures
Pirner, Miroš ; Fischer, Ondřej ; Marek, Pavel ; Urushadze, Shota
The first condition for a reliable structure is a well-judged design, correctly and carefully calculated, and based on authentic input values. So fare we were used to take these values from the Codes and in the case that they can very accidentally, this variability can be respected by means of a coefficient. A more realistic approach is to take into account directly the random nature of the property in question, and to describe it in probabilistic terms (by a histogram). This can be done with the use of SBRA (Simulation Based Reliability Assessment) method. Here some considerations are shown, how the actual Czech Codes should be reorganized for probabilistic design, in the case of dynamic civil engineering problems. In this paper the problems of loading are treated; the problems of structural response and some special examples are shown in the full text on CD.
Škody na fasádních deskách - teorie a experimentální ověřování
Kratěna, Jindřich ; Šperl, Martin ; Urushadze, Shota
The facade of a multi-storey building was clad with Cembonit cladding sheets installed in the Autumn of 2003. In the Summer of 2004 the first destruction of these cladding sheets took place particularly on the southern face of the building. Further destructions took place in the Summer of 2005. The cause of damage was investigated and ascertained both theoretically and experimentally.
Aeroelastický model s Froudeovým číslem a bez něho
Pirner, Miroš ; Fischer, Ondřej ; Urushadze, Shota
The article presents some problems related to experimental verification of footbridge vibrations excited by wind and pedestrian loads on models with and without the Froude number.
Použití pasivního tlumiče pro potlačení pohybů lávky
Pirner, Miroš ; Urushadze, Shota
This paper describes the types of footbridges which theoretical and physical models are solved. The highly sensitivity to dynamic load is decreased due to ball vibration absorber or due to liquid damper. Effectiveness comparison of the two types of dampers is recommended.
Life-time prediction of slender structures subjected to turbulent wind
Pospíšil, Stanislav ; Lahodný, J. ; Janata, J. ; Urushadze, Shota
The paper describes the prediction of theoretical life-time of antennas made from glas-reinforced laminate and the comparison with long time measurements on the real structures.
Damping possibilities of bridges
Urushadze, Shota ; Frýba, Ladislav
Equations for the vibration of a beam and string connected by an elastic layer. Experiments on a model.
Experimentální studie-Vyloučení nadměrných vibrací kapalinovým tlumičem
Pirner, Miroš ; Urushadze, Shota
The new type of passive tuned liquid damper (TLD), which relies on the motion of liquid inside a movable rectangular tank with two degrees of freedom (horizontal displacement and rotation).The authors study the influence of vessel horizontal motion of and rotation on the damping of the vertical and horizontal vibrations of the footbridges.

National Repository of Grey Literature : 43 records found   beginprevious27 - 36next  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.