Hole-drilling teknika zurezko egituren karakterizazioan
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Crespo de Antonio, Maite
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Egitura baten egungo egoera erreala zein den jakitea erronka bat da berez eta are gehiago arkitektura historikoan, heldu zaigun ondarea ahalik eta hoberen zaintzea xederik garrantzitsuena denean. Egitura baten ezaugarriak zehazteko hainbat teknika ez suntsitzaile edo erdi-ez suntsitzaileak garatzen joan izan dira azkeneko urteetan. Hole-drilling teknika erdi-ez suntsitzaileen artean kokatzen da. Teknika honek zulo txiki bat egin eta material kentze horrek zuloaren inguruan eragiten duen erlaxazioa hiru deformazio-sentsoreez osatutako erroseta baten bidez neurtzean datza. Aspalditik ezaguna da teknika hau baina bere erabilera material homogeneo eta isotropikoetara mugatzen zen. Hemen aurkezten den lanaren nobedadea teknika egurrean aplikatzen dela da. Ortotropia da egurraren bereizgarrietako bat. Honek, norabide elastiko nagusi bakoitzean (axial, erradial eta tangentzial) portaera eta ezaugarri desberdinak izaten dituela esan nahi du. Hau aurrera pauso garrantzitsua da, orain arte, material isotropikoetara soilik mugatu baita.
The deduction of the real stress state in structures is an important challenge, even more in existing buildings or historical constructions, which conservation is the main task. There are many non- destructive or minor destructive techniques around the assessment of the properties in structures are being developed in the current years. Hole-drilling technique is between minor destructive ones. The technique involves drilling a hole in a surface and measuring the relaxed strains after material removal in the surroundings of the hole. The strains are measured by means of strain gages placed forming a rosette. It is a widely known technique but its application was limited to isotropic homogeneous materials. The novelty shown in this paper is the application of the technique on timber structures. Orthotropy is one of the features in wood. The properties and behavior of wood is different in each main elastic direction (axial, radial and tangential). This is an important step because till now the technique was only used on isotropic materials.
The deduction of the real stress state in structures is an important challenge, even more in existing buildings or historical constructions, which conservation is the main task. There are many non- destructive or minor destructive techniques around the assessment of the properties in structures are being developed in the current years. Hole-drilling technique is between minor destructive ones. The technique involves drilling a hole in a surface and measuring the relaxed strains after material removal in the surroundings of the hole. The strains are measured by means of strain gages placed forming a rosette. It is a widely known technique but its application was limited to isotropic homogeneous materials. The novelty shown in this paper is the application of the technique on timber structures. Orthotropy is one of the features in wood. The properties and behavior of wood is different in each main elastic direction (axial, radial and tangential). This is an important step because till now the technique was only used on isotropic materials.
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In situ ebaluazioa, Hole-drilling teknika, zurezko egiturak, eraikin historikoak, compliance tentsorea, In site assessment, Hole-drilling, timber structures, ancient constructions, compliance tensor