. . . . . . "Kol\u00EDsko, Ji\u0159\u00ED" . "[F3FA7EF4898F]" . "Technologie betonu 2014" . "Bond; UHPC; anchorage length"@en . "Influence of the anchorage length to bond behaviour between prestressing strands and UHPC"@en . . "P\u0159\u00EDsp\u011Bvek se v\u011Bnuje t\u00E9matice soudr\u017Enosti p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC (ultra vysokohodnotn\u00FD beton). Tento relativn\u011B nov\u00FD druh materi\u00E1lu s vynikaj\u00EDc\u00EDmi materi\u00E1lov\u00FDmi vlastnostmi umo\u017E\u0148uje dle dosavadn\u00EDch zku\u0161enost\u00ED velmi v\u00FDrazn\u011B optimalizovat n\u00E1vrh detail\u016F konstrukce zejm\u00E9na s ohledem na kotevn\u00ED d\u00E9lku v\u00FDztu\u017Ee. V n\u00E1vaznosti na p\u0159edchoz\u00ED v\u00FDzkum soudr\u017Enosti beton\u00E1\u0159sk\u00E9 v\u00FDztu\u017Ee s UHPC \u010Dl\u00E1nek popisuje experiment\u00E1ln\u00ED ov\u011B\u0159en\u00ED smykov\u00FDch nap\u011Bt\u00ED na kontaktu p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC a porovn\u00E1n\u00ED v\u00FDsledk\u016F se vzorky z b\u011B\u017En\u00E9ho betonu. Z\u00EDskan\u00E9 v\u00FDsledky dok\u00E1zaly, \u017Ee kotevn\u00ED d\u00E9lka v\u00FDztu\u017Ee p\u0159i zkou\u0161ce stanoven\u00ED smykov\u00FDch nap\u011Bt\u00ED v soudr\u017Enosti m\u016F\u017Ee m\u00EDt na vyhodnocen\u00ED smykov\u00FDch nap\u011Bt\u00ED v\u00FDznamn\u00FD vliv. Jedn\u00EDm z d\u00EDl\u010D\u00EDch v\u00FDsledk\u016F experimentu je vz\u00E1jemn\u00E9 porovn\u00E1n\u00ED soudr\u017Enosti v\u00FDztu\u017Ee s UHPC na t\u011Blesech p\u0159ipraven\u00FDch dle normov\u00E9ho postupu a na t\u011Blesech vyhotoven\u00FDch z re\u00E1ln\u00FDch konstruk\u010Dn\u00EDch prvk\u016F \u2013 vy\u0159ez\u00E1n\u00EDm konc\u016F p\u0159edpjat\u00FDch nosn\u00EDk\u016F s r\u016Fzn\u00FDmi kotevn\u00EDmi d\u00E9lkami."@cs . "4"^^ . . "Praha" . "Jihlava" . "RIV/68407700:21610/14:00222447!RIV15-MSM-21610___" . "P(TA01010269), P(TE01020168), S" . "Vliv kotevn\u00ED d\u00E9lky na soudr\u017Enost p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC" . "P\u0159\u00EDsp\u011Bvek se v\u011Bnuje t\u00E9matice soudr\u017Enosti p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC (ultra vysokohodnotn\u00FD beton). Tento relativn\u011B nov\u00FD druh materi\u00E1lu s vynikaj\u00EDc\u00EDmi materi\u00E1lov\u00FDmi vlastnostmi umo\u017E\u0148uje dle dosavadn\u00EDch zku\u0161enost\u00ED velmi v\u00FDrazn\u011B optimalizovat n\u00E1vrh detail\u016F konstrukce zejm\u00E9na s ohledem na kotevn\u00ED d\u00E9lku v\u00FDztu\u017Ee. V n\u00E1vaznosti na p\u0159edchoz\u00ED v\u00FDzkum soudr\u017Enosti beton\u00E1\u0159sk\u00E9 v\u00FDztu\u017Ee s UHPC \u010Dl\u00E1nek popisuje experiment\u00E1ln\u00ED ov\u011B\u0159en\u00ED smykov\u00FDch nap\u011Bt\u00ED na kontaktu p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC a porovn\u00E1n\u00ED v\u00FDsledk\u016F se vzorky z b\u011B\u017En\u00E9ho betonu. Z\u00EDskan\u00E9 v\u00FDsledky dok\u00E1zaly, \u017Ee kotevn\u00ED d\u00E9lka v\u00FDztu\u017Ee p\u0159i zkou\u0161ce stanoven\u00ED smykov\u00FDch nap\u011Bt\u00ED v soudr\u017Enosti m\u016F\u017Ee m\u00EDt na vyhodnocen\u00ED smykov\u00FDch nap\u011Bt\u00ED v\u00FDznamn\u00FD vliv. Jedn\u00EDm z d\u00EDl\u010D\u00EDch v\u00FDsledk\u016F experimentu je vz\u00E1jemn\u00E9 porovn\u00E1n\u00ED soudr\u017Enosti v\u00FDztu\u017Ee s UHPC na t\u011Blesech p\u0159ipraven\u00FDch dle normov\u00E9ho postupu a na t\u011Blesech vyhotoven\u00FDch z re\u00E1ln\u00FDch konstruk\u010Dn\u00EDch prvk\u016F \u2013 vy\u0159ez\u00E1n\u00EDm konc\u016F p\u0159edpjat\u00FDch nosn\u00EDk\u016F s r\u016Fzn\u00FDmi kotevn\u00EDmi d\u00E9lkami." . "RIV/68407700:21610/14:00222447" . . "3"^^ . "Vliv kotevn\u00ED d\u00E9lky na soudr\u017Enost p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC"@cs . . "978-80-903806-4-6" . "21610" . . "Vliv kotevn\u00ED d\u00E9lky na soudr\u017Enost p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC" . "53716" . "Influence of the anchorage length to bond behaviour between prestressing strands and UHPC"@en . "Ultra High Performance Concrete - UHPC is a relatively new type of composite material with outstanding features (high compressive strength, high tensile strength and high durability). Also the bond strength between steel reinforcement and UHPC is better than that in ordinary concrete. This fact needs to be quantified, because no standard prescribes the bond behavior of UHPC and design of UHPC in general. The main aim of the experimental research was to determine the average bond stress between prestressing strands and different types of UHPC. The second aim was to show very significant increase of the average shear stress in bond of UHPC compared to that of ordinary concrete. In order to determine the bond capacity, two types of experimental specimens \u2013 parts of prestressed girders and specimens prepared according to standard, were tested in the laboratory. The specimens were prepared for pull out test, in which the prestressing strand is pulled out from the cube or part of girder made from UHPC. The tensile force in strand and slip of the end of reinforcement were measured and then the average bond stress was examined. The influence of different material properties and different anchorage lengths of prestressing strands to bond behavior of UHPC was examined and results were compared to these phenomena of ordinary concrete. The results of bond test led to the conclusion that the application of UHPC can significantly reduce the anchorage length of reinforcement compared with that in ordinary concrete"@en . "V\u00EDtek, Jan" . . . . "Hu\u0148ka, Petr" . . "\u010C\u00EDtek, David" . "6"^^ . . . "Vliv kotevn\u00ED d\u00E9lky na soudr\u017Enost p\u0159edp\u00EDnac\u00ED v\u00FDztu\u017Ee a UHPC"@cs . . . "2014-04-09+02:00"^^ . "\u010CBS - \u010Cesk\u00E1 beton\u00E1\u0159sk\u00E1 spole\u010Dnost \u010CSSI" . .