20.500.12556/DiRROS-17546 Potresni odziv večetažnih strižnih zidanih sten in učinek utrjevanja s kompozitnimi oblogami Seismic response of multistorey plain masonry walls and efficiency of strengthening with composites večetažnih sten, sezidanih iz modularnih zidakov, s poudarkom na opazovanju mehanizmov odziva in porušitve, ki se razvijejo v večetažnih stenah z odprtinami. Druga tema je osredotočena na raziskave utrjevanja takšnega zidovja z malto, armirano z mrežicami iz steklenih vlaken. Za raziskave smo na Zavodu za gradbeništvo Slovenije zgradili in preiskali posamezne zidove in večji trietažni preizkušanec v naravni velikosti. V cikličnem strigu pri konstantnem tlaku smo preizkusili več referenčnih in utrjenih zidov ter trietažni model dimenzij 4 x 4 m v tlorisu in višine 6,7 m. Trietažni model smo najprej obremenili do večjih, a popravljivih poškodb. Zatem smo poškodovani preizkušanec utrdili s kompozitnimi oblogami iz malte, armirane s steklenimi vlakni (GFRP), ter ga ponovno preiskali, tokrat skoraj do porušitve. V obeh primerih je bil odziv modela na vodoravno obtežbo s t. i. etažnim mehanizmom, pri katerem se večina poškodb skoncentrira v zidovih najšibkejše etaže. V zidovih smo opazili tipične strižne poškodbe z diagonalnimi razpokami. Potresno obnašanje posameznih zidov je bilo zelo podobno odzivu zidnih slopov večetažnega preizkušanca. Rezultati kažejo, da je mogoče z ustreznim načinom utrjevanja zidov doseči občutno izboljšanje potresnega obnašanja. Two topics are presented in the paper. The first one deals with seismic behaviour of multistorey masonry shear walls with openings built from hollow clay units. Special attention is given to the response and failure mechanisms. The second one deals with strengthening of such masonry with fibre reinforced mortar coatings. To study these topics, full scale walls as well as a full scale three storey model were built and tested at Slovenian National Building and Civil Engineering Institute. Reference and strengthened walls as well as the three storey building model with plan dimensions 4 m x 4 m and height of 6.7 m were tested in cyclic shear under constant compressive load. First, the multistorey model was tested in its original state until major but still repairable damage. Then, the damaged model was strengthened with glass fibre (GFRP) mesh reinforced mortar and re-tested to near collapse. In both cases the response to horizontal loads was with storey mechanism, with the majority of damage concentrated in the walls of the weakest storey. The dominant damage was of the diagonal shear type. The seismic response of individual walls tested in cyclic shear was very similar to what was observed in the walls of the multistorey model. Results show that seismic response of masonry structures can be significantly improved by an appropriate strengthening method. nearmirano zidovje laboratorijske preiskave ciklične strižne preiskave GFRP-kompoziti utrjevanje unreinforced masonry laboratory testing cyclic shear test glass fibre reinforced polymers (GFRP) strengthening true false true Zveza društev gradbenih inženirjev in tehnikov Slovenije Slovenski jezik Angleški jezik Neznano 2023-12-13 08:29:01 2023-12-13 08:29:02 2023-12-14 03:36:38 0000-00-00 00:00:00 2018 0 0 str. 74-85 Letn. 67 apr. 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2018-04-01 624.042.7:692.2(497.4) 0017-2774 8442465 RAZ_Triller_Petra_2018.pdf RAZ_Triller_Petra_2018.pdf 1 FF28FEC7C9CFA87E5FC38A11DB0D1D0C 5bd7e4ce5258843b1c68417598f721f072b4e462aa0066453a33da6fc224e0ef b94ba188-9981-11ee-9ccb-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=23846 http://arhiv.izs.si/fileadmin/dokumenti/msg/Gradbeni-vestnik-april-2018.pdf 0 be79333c-9981-11ee-9ccb-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=23847 Zavod za gradbeništvo Slovenije 0 0 0