|
|
Investigations of orthotropic decks
Urushadze, Shota ; Frýba, Ladislav ; Pirner, Miroš
The investgations of orthotropic decks carried out in the Institute of Theoretivcal and Applied Mechanics,v.v.i., Academy of Sciensces of the Czech Republic, for the project of the European Union „BRIFAG“ are described. The response of orthotropic decks is studie under dynamic loads including the crack propagation, estimation of fatigue life of the bridge elements, e.t.c. It was found that the most vulenrable detail appeared at the spatial connection of the deck with cross and longitudinal beams. The most important results are shown in a a figure of stress ranges as a function of the number of stress cycles.
|
|
| |
|
| |
|
| |
|
|
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.
|
|
| |
|
|
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.
|
|
| |
|
| |
|
| |
guest ::
