An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results

Because of non-linear and settlement dependent behavior of soil and effect of the interactions, understanding the behavior of piles and raft and the load sharing mechanism in piled rafts is a key issue. Recently, researchers have introduced few normalized hyperbolic models according to numerical ana...

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Autores principales:	Mohammad Jamal Malekkhani, Jafar Bolouri Bazzaz
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	piled raft foundation pile group unpiled raft load sharing ratio hyperbolic model Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/cd638a4cd1a84861a120b2130e56dd36
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spelling	oai:doaj.org-article:cd638a4cd1a84861a120b2130e56dd362021-11-08T15:54:19ZAn investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results2476-39772538-261610.22065/jsce.2019.171280.1779https://doaj.org/article/cd638a4cd1a84861a120b2130e56dd362021-03-01T00:00:00Zhttps://www.jsce.ir/article_88122_ebc19233f4d173c2232d95ca0724b132.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Because of non-linear and settlement dependent behavior of soil and effect of the interactions, understanding the behavior of piles and raft and the load sharing mechanism in piled rafts is a key issue. Recently, researchers have introduced few normalized hyperbolic models according to numerical analysis to estimate the load-sharing ratio of piles in piled raft foundations. These models are based on experimental results and considering different interaction effects between pile-raft-soil, raft, and pile dimensions and the amount of settlement. The aim of this research is to investigate the behavior of piled raft foundation and to estimate the load-sharing ratio of piles experimentally. So, various tests have been conducted on piled rafts, group piles, and unpiled rafts under vertical loading by changing the number and length of piles and density of bed sand. For this purpose, an innovative combined loading system, instrumented by measuring devices, is designed and constructed; then the load-sharing ratio of piles from the total load with a novel method is estimated by measuring soil pressure underneath the raft at any settlement. According to the results, bearing capacity of piled raft foundation in analogous conditions is more than unpiled raft and twice group piles approximately. Also increasing the number of piles in piled rafts and group piles increases bearing capacity and reduces raft settlement. The load sharing ratio of piles shows downward trend by increasing settlement and it increases with increasing the number of piles in the same conditions. In this study, the ultimate bearing capacity of group piles which have been experimentally obtained is compared with the ultimate criterion of the hyperbolic model proposed by other researchers. Then, the model is modified by mathematical analysis methods indicating good agreement between experimental and analytical results.Mohammad Jamal MalekkhaniJafar Bolouri BazzazIranian Society of Structrual Engineering (ISSE)articlepiled raft foundationpile groupunpiled raftload sharing ratiohyperbolic modelBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 1, Pp 307-326 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	piled raft foundation pile group unpiled raft load sharing ratio hyperbolic model Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	piled raft foundation pile group unpiled raft load sharing ratio hyperbolic model Bridge engineering TG1-470 Building construction TH1-9745 Mohammad Jamal Malekkhani Jafar Bolouri Bazzaz An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
description	Because of non-linear and settlement dependent behavior of soil and effect of the interactions, understanding the behavior of piles and raft and the load sharing mechanism in piled rafts is a key issue. Recently, researchers have introduced few normalized hyperbolic models according to numerical analysis to estimate the load-sharing ratio of piles in piled raft foundations. These models are based on experimental results and considering different interaction effects between pile-raft-soil, raft, and pile dimensions and the amount of settlement. The aim of this research is to investigate the behavior of piled raft foundation and to estimate the load-sharing ratio of piles experimentally. So, various tests have been conducted on piled rafts, group piles, and unpiled rafts under vertical loading by changing the number and length of piles and density of bed sand. For this purpose, an innovative combined loading system, instrumented by measuring devices, is designed and constructed; then the load-sharing ratio of piles from the total load with a novel method is estimated by measuring soil pressure underneath the raft at any settlement. According to the results, bearing capacity of piled raft foundation in analogous conditions is more than unpiled raft and twice group piles approximately. Also increasing the number of piles in piled rafts and group piles increases bearing capacity and reduces raft settlement. The load sharing ratio of piles shows downward trend by increasing settlement and it increases with increasing the number of piles in the same conditions. In this study, the ultimate bearing capacity of group piles which have been experimentally obtained is compared with the ultimate criterion of the hyperbolic model proposed by other researchers. Then, the model is modified by mathematical analysis methods indicating good agreement between experimental and analytical results.
format	article
author	Mohammad Jamal Malekkhani Jafar Bolouri Bazzaz
author_facet	Mohammad Jamal Malekkhani Jafar Bolouri Bazzaz
author_sort	Mohammad Jamal Malekkhani
title	An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
title_short	An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
title_full	An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
title_fullStr	An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
title_full_unstemmed	An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
title_sort	investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/cd638a4cd1a84861a120b2130e56dd36
work_keys_str_mv	AT mohammadjamalmalekkhani aninvestigationonthebearingcapacityofpiledraftfoundationsexperimentallyandcomparisonwithmodifiedhyperbolicmodelresults AT jafarbolouribazzaz aninvestigationonthebearingcapacityofpiledraftfoundationsexperimentallyandcomparisonwithmodifiedhyperbolicmodelresults AT mohammadjamalmalekkhani investigationonthebearingcapacityofpiledraftfoundationsexperimentallyandcomparisonwithmodifiedhyperbolicmodelresults AT jafarbolouribazzaz investigationonthebearingcapacityofpiledraftfoundationsexperimentallyandcomparisonwithmodifiedhyperbolicmodelresults
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An investigation on the bearing capacity of piled raft foundations experimentally and comparison with modified hyperbolic model results

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