20.500.12556/DKUM-70859 A fundamental study of the performance of X-section cast-in-place concrete single piles Temeljna študija o učinkovitosti na mestu izdelanega samostojnega betonskega pilota X prereza X-section cast-in-place concrete (XCC) piles are used because they have a higher bearing capacity than circularsection cast-in-place concrete (CCC) piles of the same cross-sectional area. Although the bearing capacity of XCC piles has been studied, the performance of XCC single piles, especially for the stress-transfer mechanism dependent on the geometrical effects, is still not fully understood. This paper reports two comparative field static load tests on an XCC and a CCC single pile of the same cross-sectional area. In addition, corresponding threedimensional numerical back-analyses are performed to provide a fundamental understanding. The measured and computed results reveal that the XCC single pile has an approximately 25% higher ultimate bearing capacity than the CCC single pile. This is because the XCC single pile has an approximately 20% larger total side resistance, which is caused by a 60% larger pile perimeter and a slightly smaller unit side resistance. Lateral soil arching effects are developed, causing a non-uniform effective normal stress and a shear stress across the circumference of the XCC single pile. It is suggested that XCC single piles have a higher efficiency in terms of material saving compared with CCC single piles. Na mestu izdelani betonski piloti X prereza (XCC) se uporabljajo, ker imajo višjo nosilnost kot na mestu izdelani betonski piloti krožnega prereza (CCC) z enako površino prereza. Čeprav je bila preučevana nosilnost XCC pilotov, uspešnost samostojnih XCC pilotov, predvsem glede mehanizma prenosa napetosti v odvisnosti od geometrijskih učinkov, še vedno ni povsem jasna. V prispevku je podana primerjava terenskih statičnih obremenilnih preizkusov za XCC in CCC samostojna pilota z enako površino prečnega prereza. Za boljše razumevanje so bile dodatno izvedene tridimenzionalne numerične povratne analize. Izmerjeni in izračunani rezultati kažejo, da ima XCC samostojni pilot približno 25% višjo mejno nosilnost kot CCC samostojni pilot. To je zato, ker ima XCC samostojni pilot približno 20% višji skupni stranski odpor, ki je zaradi 60% večjega obsega prereza pilota in nekoliko manjše stranske odpornosti na enoto površine. V zemljini so se razvili bočni ločni učinki, ki povzročajo neenakomerno razporeditev efektivne normalne in strižne napetosti po obsegu XCC samostojnega pilota. Ugotovimo lahko, da imajo XCC samostojni piloti višjo učinkovitost z vidika privarčevanega materiala v primerjavi s CCC samostojnimi piloti. X-section cast-in-place concrete pile field static load test three-dimensional numerical back-analysis stresstransfer mechanism side resistance soil arching na mestu izdelan betonski pilot X prereza terenski statični obremenilni preizkus tridimenzionalni numerična povratna analiza mehanizem prenosa napetosti stranska odpornost ločni efekt zemljine true false true Angleški jezik Slovenski jezik Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru Znanstveno delo 2018-06-15 14:52:30 2018-06-15 14:53:32 2023-07-31 09:16:54 2019-07-11 18:22:15 2016 0 0 str. 39-47 št. 1 Letn. 13 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1854-0171 624.13 215987712 302749184 1854-0171 URN:SI:UM:DK:IFZN6Q1Z Acta_geotechnica_Slovenica_2016_Wang_et_al._A_fundamental_study_of_the_performance_of_X-section_cast-in-place_concrete_single_piles.pdf Acta_geotechnica_Slovenica_2016_Wang_et_al._A_fundamental_study_of_the_performance_of_X-section_cast-in-place_concrete_single_piles.pdf 1 74CB1741C01CD737F213196EE1A3284B beef3441549171cc0a59eefd438b27a961466aac21b40cc36474d845af621113 0afd3ed3-7c10-11eb-bb7a-00155d0001ca 20.500.12556/dkum/b1063646-cd77-425d-9718-0dd55da8b9c0 https://dk.um.si/Dokument.php?lang=slv&id=125770 http://fgserver3.fg.um.si/journal-ags/2016-1/article-4.asp 1 https://dk.um.si/Dokument.php?lang=slv&id=125769 Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Acta geotechnica Slovenica 0 0 0