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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.
2022 - English
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.
Keywords:
considerately destructive tests; mini-jack method; destructive tests; assessment of mechanical characteristics of wood; historic timber
Available at various institutes of the ASCR
Comparison of mechanical properties of wood determined by local gently destructive tests and fully destructive tests on building elements
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. ...
Verification of the fatigue resistance of 40 kN pin load gauges from ČSN 17 029 material
Šperl, Martin; Gajdoš, Lubomír; Bejdl, Jan
2022 - Czech
Fatigue loading in three-point bending of two pin load gauges from ČSN 17 029 steel was carried out in the load range 5 – 35 kN for two million cycles to prove the required fatigue resistance of the pins. Únavové zatěžování v tříbodovém ohybu dvou čepových tenzometrů z oceli ČSN 17 029 bylo provedeno v rozsahu zatížení 5 – 35 kN na dva miliony cyklů pro prokázání požadované únavové odolnosti čepů.
Keywords:
pin load gauge; fatigue; pulsating loading; three-point bending
Available at various institutes of the ASCR
Verification of the fatigue resistance of 40 kN pin load gauges from ČSN 17 029 material
Fatigue loading in three-point bending of two pin load gauges from ČSN 17 029 steel was carried out in the load range 5 – 35 kN for two million cycles to prove the required fatigue resistance of the ...
Stucco decoration of the coffered dome in Boim Chapel, Lviv (Ukraine)
Svorová Pawełkowicz, Sylwia; Myślicka, M.; Witkowski, M.
2022 - English
The Boim Chapel in Lviv, erected at the beginning of the 17th c. (1609–1611) as a family mausoleum by Jerzy (Georg) Boim, a wealthy merchant originating from Hungary, since 1967 is part of the Lviv National Art Gallery. Although today it forms a visual dominant of the Cathedral Square, until the end of 18th c. it was surrounded by other funeral chapels as part of the city’s cemetery. It represents one of the most important examples of Mannerist, profusely decorated, architectural style on the historical territory of the Polish-Lithuanian Commonwealth (covering today’s territories of Poland, Lithuania, Byelorussia and western Ukraine). Its exterior and interior decoration has mostly been executed\nin local stone except the stuccoworks in the coffered dome. The hemisphere has been divided into three rows of coffers, where at the bottom portrait busts of the Boim family, in the middle of prophets and at the top of saints have been placed. The space between the coffers, painted most probably in 1925 in blue, has been decorated with gilded stucco stars. In 2019, an archival and material research was launched to plan future restoration works in the chapel. For the time being, only a few samples have been taken to study the technique of stuccoworks in the coffered dome. The results of this preliminary research gave us an insight into the original technique and subsequent renovation works. The architectural decoration, such as frames, have been moulded on site, while the portrait busts and stars have been mounted as precast elements. The archival research was helpful in interpreting the material research results.
Keywords:
painted stucco; coffered dome; Mannerism; Boim Chapel (Lviv); Slava Ukraini!
Available at various institutes of the ASCR
Stucco decoration of the coffered dome in Boim Chapel, Lviv (Ukraine)
The Boim Chapel in Lviv, erected at the beginning of the 17th c. (1609–1611) as a family mausoleum by Jerzy (Georg) Boim, a wealthy merchant originating from Hungary, since 1967 is part of the Lviv ...
Material tests of pipe samples takes from high pressure gas pipeline Sviňomazy-Vřesová (locality L177 / 2), II. stage of part B1 (hydrogen exposure)
Gajdoš, Lubomír; Šperl, Martin; Šorm, Filip; Bejdl, Jan
2021 - Czech
The main goal of this work is the evaluation of hydrogen effect to material properties of the pipeline steel and its possible transformations. Práce slouží k posouzení vlivu vodíku na případnou změnu materiálových vlastností oceli plynovodu.
Keywords:
hydrogen exposure; gas pipeline; autoclave; material properties
Available at various institutes of the ASCR
Material tests of pipe samples takes from high pressure gas pipeline Sviňomazy-Vřesová (locality L177 / 2), II. stage of part B1 (hydrogen exposure)
The main goal of this work is the evaluation of hydrogen effect to material properties of the pipeline steel and its possible transformations.
Characterization of injection material Ledan TA1 for the needs of the preservation of the architectural fragment located under the 3rd courtyard of Prague Castle
Slížková, Zuzana; Viani, Alberto; Frankeová, Dita; Mácová, Petra; Ševčík, Radek; Fabeš, Roman
2021 - Czech
For the purpose of restoring a Romanesque fragment of marl nearby the Old Royal palace, a material survey of the LEDAN TA1 product was carried out. The study aimed to assess the compatibility of this preservative material with historic marl masonry. Pro účel restaurování opukového zdiva, zejména románského fragmentu z opuky poblíž Starého královského paláce, byla provedena analýza injektážního pojiva LEDAN TA1. Materiálový průzkum produktu LEDAN TA1 byl motivován úkolem posouzení kompatibility tohoto konzervačního materiálu s historickým opukovým zdivem.
Keywords:
LEDAN TA1; marl masonry; preservation
Available at various institutes of the ASCR
Characterization of injection material Ledan TA1 for the needs of the preservation of the architectural fragment located under the 3rd courtyard of Prague Castle
For the purpose of restoring a Romanesque fragment of marl nearby the Old Royal palace, a material survey of the LEDAN TA1 product was carried out. The study aimed to assess the compatibility of this ...
Survey of the ceiling structure of the library in the Jesuits dormitory in Telč
Válek, Jan; Skružná, Olga
2021 - Czech
The aim of the non-destructive survey was to reach better description of the ceiling structure before the planned reconstruction of the library. Cílem nedestruktivního průzkumu bylo bližší poznání stropní konstrukce před plánovanou rekonstrukcí knihovny.
Keywords:
ground penetrating radar (GPR); non-destructive survey; radargrams; cultural heritage
Available at various institutes of the ASCR
Survey of the ceiling structure of the library in the Jesuits dormitory in Telč
The aim of the non-destructive survey was to reach better description of the ceiling structure before the planned reconstruction of the library.
Stress analysis of vaults in the building of the Masaryk´s University Centre in Telč
Bayer, Jan; Drdácký, Miloš
2021 - Czech
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. Zpráva shrnuje výsledky z místních šetření, expertních posudků a výpočtů, které se týkají kleneb v objektu bývalé jezuitské koleje v Telči na náměstí Zachariáše z Hradce č.p. 2. Podmětem pro šetření byl nedostatek podkladů pro posouzení zatížitelnost kleneb pro nový účel: zřízení veřejné knihovny kombinované s galerií. Provedené výpočty MKP slouží pro odhad napjatosti klenby v místnosti 0.22Aa nenahrazují statický výpočet, ale mohou sloužit jako podklad pro eventuální zpracování podrobného statického výpočtu.
Keywords:
masonry vaults; ground penetrating radar (GPR); ANSYS; stress analysis; Jesuits dormitory in Telč
Available at various institutes of the ASCR
Stress analysis of vaults in the building of the Masaryk´s University Centre in Telč
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 ...
Characterization of stone and mortar sampled from Romanesque architectural fragment in archeological site under Prague Castle (CZ)
Slížková, Zuzana; Frankeová, Dita; Bauerová, Pavla; Viani, Alberto; Kozlovcev, Petr; Svoboda, Milan
2021 - Czech
Material characterization of silicite stone and bending earth-lime mortar sampled from the archeological site below the 3rd courtyard of Prague Castle provides data on the chemical and mineralogical composition and microstructure of stone and mortar for the needs of the historic structure conservation. Materiálový rozbor opuky a zdící malty z archeologického terénu pod III. nádvořím Pražského hradu poskytuje údaje o chemickém a mineralogickém složení materiálů a jejich mikrostruktuře pro potřeby konzervace památky.
Keywords:
historic building; material characterization; archeological site; silicite; earth-lime mortar; Mg porozimetry; SEM-EDS analysis
Available at various institutes of the ASCR
Characterization of stone and mortar sampled from Romanesque architectural fragment in archeological site under Prague Castle (CZ)
Material characterization of silicite stone and bending earth-lime mortar sampled from the archeological site below the 3rd courtyard of Prague Castle provides data on the chemical and mineralogical ...
Chemical and microstructural characterization of the artificial stone sample from the sandstone arcade at the Moravský Krumlov Castle
Frankeová, Dita; Koudelková, Veronika; Bauerová, Pavla; Slížková, Zuzana
2021 - Czech
As part of the construction and technical survey, a microscopic analysis of samples of the artificial stone sample was performed using a scanning electron microscope and SEM ‐ EDS analysis. Characterization of mortars' aggregate and binder components was performed, and the binder was identified as portland cement. V rámci stavebně-technického průzkumu byl proveden mikroskopický rozbor vzorku umělého kamene s využitím skenovacího elektronového mikroskopu a SEM‐EDS analýzy. Byla provedena charakterizace plniva a složek pojiva. Analýzy prokázaly, že pojivo umělého kamene je anorganické na bázi portlandského cementu
Keywords:
artificial stone; microscopic characterization; EDS analysis
Available at various institutes of the ASCR
Chemical and microstructural characterization of the artificial stone sample from the sandstone arcade at the Moravský Krumlov Castle
As part of the construction and technical survey, a microscopic analysis of samples of the artificial stone sample was performed using a scanning electron microscope and SEM ‐ EDS analysis. ...
Survey of the constructions hidden under the floor of the castle chapel of All Saints in Telč
Válek, Jan; Skružná, Olga
2021 - Czech
The aim of the non-destructive survey was to determine the presence of building construction hidden under the contemporary floor. The survey confirmed the position of underground crypt and revealed no other structures. Cílem nedestruktivního průzkumu bylo zjistit přítomnost stavebních konstrukcí skrytých pod soudobou podlahou. Průzkum potvrdil polohu krypty a neodhalil žádné další konstrukce.
Keywords:
ground penetrating radar (GPR); non-destructive survey; radargrams; cultural heritage
Available at various institutes of the ASCR
Survey of the constructions hidden under the floor of the castle chapel of All Saints in Telč
The aim of the non-destructive survey was to determine the presence of building construction hidden under the contemporary floor. The survey confirmed the position of underground crypt and revealed no ...
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