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Modified coefficient of subgrade reaction to laterally loaded piles ; Modificiran modul reakcije tal za bočno obtežene pilote
An accurate prediction of the load capacity of a laterally loaded pile at a permissible displacement is an important concern at the design stage. In contrast to many sophisticated methods, Broms’ method based on moment equilibrium has been preferred by engineers to predict the load capacities of laterally loaded piles due to both its simplicity and because it is established on a way of hand calculation. However, Broms’ method typically overestimates a pile’s lateral load capacity as it requires a constant coefficient of horizontal subgrade reaction (nh) into analyses, regardless of the magnitude of the pile’s top displacement. In this study, modified coefficients of subgrade reactions(nh*) that are sensitive to the pile’s top displacement in cohesionless soils are first proposed to improve the performance level of Broms’ method for the prediction of the load capacity of a laterally loaded pile as the pile’s top displacement increases. The modified values of nh* are calibrated using 45 independently free-head, single-driven, full-scale pile tests from 23 sites in cohesionless soils. It is demonstrated that Broms’ method with nh* would correctly estimate a pile’s lateral load-deflection behavior with accuracy levels similar to more complicated methods. ; Natančna napoved nosilnosti bočno obteženega pilota pri dovoljenem pomiku je pomembna v fazi načrtovanja. V nasprotju s številnimi sofisticiranimi metodami so inženirji največkrat napovedovali nosilnost bočno obteženih pilotov z Bromsovo metodo, ki temelji na ravnotežju momentov, zaradi svoje preprostosti in ker se izračun praktično izvede “na roke”. Vendar pa Bromsova metoda običajno precenjuje bočno obremenitev pilota, ker se v analizah upošteva konstanten horizontalni modul reakcije tal (nh), ne glede na velikost premika pilota na vrhu. V študiji so najprej predstavljeni modificirani moduli reakcije tal (nh*) za nekohezivne zemljine, ki izboljšajo učinkovitost Bromsove metode za napoved nosilnosti bočno obteženih pilotov z naraščanjem premika pilota na vrhu. Modificirane vrednosti nh* so bile kalibrirane z uporabo rezultatov 45 samostojnih preizkusov pilotov s 23 gradbišč v nekohezivnih tleh, s prosto glavo pilota in posamično zabitih. Pokazano je, da Bromsova metoda z nh* pravilno oceni obnašanje bočno obteženega pilota s podobno natačnostjo kot jo dosežemo pri bolj zapletenih metodah.
Modified coefficient of subgrade reaction to laterally loaded piles ; Modificiran modul reakcije tal za bočno obtežene pilote
An accurate prediction of the load capacity of a laterally loaded pile at a permissible displacement is an important concern at the design stage. In contrast to many sophisticated methods, Broms’ method based on moment equilibrium has been preferred by engineers to predict the load capacities of laterally loaded piles due to both its simplicity and because it is established on a way of hand calculation. However, Broms’ method typically overestimates a pile’s lateral load capacity as it requires a constant coefficient of horizontal subgrade reaction (nh) into analyses, regardless of the magnitude of the pile’s top displacement. In this study, modified coefficients of subgrade reactions(nh*) that are sensitive to the pile’s top displacement in cohesionless soils are first proposed to improve the performance level of Broms’ method for the prediction of the load capacity of a laterally loaded pile as the pile’s top displacement increases. The modified values of nh* are calibrated using 45 independently free-head, single-driven, full-scale pile tests from 23 sites in cohesionless soils. It is demonstrated that Broms’ method with nh* would correctly estimate a pile’s lateral load-deflection behavior with accuracy levels similar to more complicated methods. ; Natančna napoved nosilnosti bočno obteženega pilota pri dovoljenem pomiku je pomembna v fazi načrtovanja. V nasprotju s številnimi sofisticiranimi metodami so inženirji največkrat napovedovali nosilnost bočno obteženih pilotov z Bromsovo metodo, ki temelji na ravnotežju momentov, zaradi svoje preprostosti in ker se izračun praktično izvede “na roke”. Vendar pa Bromsova metoda običajno precenjuje bočno obremenitev pilota, ker se v analizah upošteva konstanten horizontalni modul reakcije tal (nh), ne glede na velikost premika pilota na vrhu. V študiji so najprej predstavljeni modificirani moduli reakcije tal (nh*) za nekohezivne zemljine, ki izboljšajo učinkovitost Bromsove metode za napoved nosilnosti bočno obteženih pilotov z naraščanjem premika pilota na vrhu. Modificirane vrednosti nh* so bile kalibrirane z uporabo rezultatov 45 samostojnih preizkusov pilotov s 23 gradbišč v nekohezivnih tleh, s prosto glavo pilota in posamično zabitih. Pokazano je, da Bromsova metoda z nh* pravilno oceni obnašanje bočno obteženega pilota s podobno natačnostjo kot jo dosežemo pri bolj zapletenih metodah.
Modified coefficient of subgrade reaction to laterally loaded piles ; Modificiran modul reakcije tal za bočno obtežene pilote
Gurbuz, Ayhan (Autor:in)
11.10.2018
Acta geotechnica Slovenica, vol. 15, no. 1, pp. 77-85, 2018. ; ISSN: 1854-0171
Paper
Elektronische Ressource
Englisch
DDC:
690
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