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Vibrations of a gable of a church excited by ringing
Fischer, Ondřej ; Urushadze, Shota
The gable is of triangular shape, not being supported horizontally by the roof or any other stiffening structure. The measurements revealed that the bells excite the vibrations of towers and of the basement of the gable with moderate amplitudes, while the cantilever of the gable wall apmlifies the motion by the resonance - effect.
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Kapalinový tlumič pro lávky
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 and rotation on the damping of the vertical and horizontal vibrations of the footbridges. Experimental solution consists in the determination of the magnitude of the excitation force of the shaking table required under resonance during the harmonic excitation of the vessel the dimensions of which correspond with the dimensions of the girder of the footbridge.
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DELIVERABLE D9.5 Damaged Masonry
Drdácký, Miloš ; Lesák, Jaroslav ; Urushadze, Shota ; Válek, Jan
Several masonry trial wallets were prepared for the testing. The specimens were mounted into a special testing rig which enabled simultaneous uniform compression and cyclic horizontal loading on the top of the tested specimen. There were four hydraulic jacks generating the vertical load which was transmitted to the wall by eight ties and a steel 'hatö on the top of the wall. Horizontal displacement (force) on the top of the wall was introduced from servo-hydraulic MTS actuator of 250 kN capacity. Experimental part involved testing of brick walls for determination of crack pattern development under various combined loadings and testing of brick, sandstone and marly lime stone walls for crack and damage determination by application of NDT methods. Four approaches have been studied and evaluated: i) sonic wave propagation, ii) stress wave propagation, iii) crack pattern development, iv) modal analysis in which also a case study has been accompanied with a related pilot shaking table test of a one leaf masonry model.
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