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Report on the structural survey of Judith's Tower in Prague 1. Part II
Drdácký, Miloš ; Kloiber, Michal ; Frankl, Jiří ; Zíma, Pavel ; Wolf, Benjamin
For the intended restoration of the object, a survey of structures that show faults or for which knowledge of material characteristics is needed for calculations confirming the reliability of the structures was requested. During the implementation of the order, there were difficulties that affected the necessity of its execution in two stages. The user of the tower cooperated with the authors of this report without any problems, and therefore it was possible to carry out the work listed below in the necessary scope and quality.
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Monitoring the movement of the cemetery church Vsech svatych in Kutna Hora - Sedlec
Zíma, Pavel ; Drdácký, Miloš
The cemetery church Vsech svatych above the ossuary in Kutna Hora Sedlec is a part of a cultural monument of world importance. In view of the planned and later realized archaeological and construction activities in its immediate vicinity, there was a requirement to monitor in long-term its movements, especially the tilt of the towers and the entire building. The deformations of the floors in the ossuary signalized the possibility of the instability of the church's foundation and the danger of the appearance and development of faults in its masonry structures.
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Comparison of mechanical properties of wood determined by local gently destructive tests and fully destructive tests on building elements
Drdácký, Miloš ; Kloiber, Michal ; Valluzzi, M. R. ; Casarin, F.
Demolition or repair of historic buildings is a valuable source of test materials for testing nondestructive and gently destructive methods for estimating the mechanical properties of built-in wood. The article uses the results of one such opportunity, when it was possible to study the mechanical properties of wood obtained by local measurements on a larger sample of historic and new wooden beams and compare them with the properties calculated from destructive tests of structural elements. Thirty-one wood elements (nineteen recovered from disassembled buildings and twelve new) were subjected to considerately destructive local tests using a loading mini-jack method. In this method, a small loading jack is inserted into a precisely drilled hole and a load test of the wood in compression along the fibers is performed on a part of the hole wall while measuring the achieved deformation under load. Red and white firs, and pine species constituted the recovered elements - red fir and larch the new ones. Destructive tests (in bending and compression) were also carried out on ten recovered and six new elements, and results were correlated with those of considerately destructive tests. Comparison of the assessed mechanical properties shows reasonably good correlation and promising conclusions for practical applications.
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A partial report on the structural survey of Judith's Tower in Prague 1
Drdácký, Miloš ; Eisler, Marek ; Zíma, Pavel
For the intended restoration of the object, a survey of structures that show faults or for which knowledge of material characteristics is needed for calculations confirming the reliability of the structures was requested. During the implementation of the order, there were difficulties that affected the necessity of its execution in two stages. The user of the tower cooperated with the authors of this report without any problems, and therefore it was possible to carry out the work listed below in the necessary scope and quality.
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Stress analysis of vaults in the building of the Masaryk´s University Centre in Telč
Bayer, Jan ; Drdácký, Miloš
The report summarizes the results of local surveys, expert opinions and analysis concerning the vaults in the building of the former Jesuit dormitory in Telč on Zachariáš Square in Hradec no. 2. The investigation was induced by the lack of inputs data for the assessment of the vaults for a new purpose: the establishment of a public library combined with a gallery. The performed FEM calculations estimated the stresses in the vaults of the room 0.22A and do not replace the static calculation, but can serve as an input information for a possible design project.
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