Banca de DEFESA: MANOEL LEANDRO ARAUJO E FARIAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MANOEL LEANDRO ARAUJO E FARIAS
DATA : 14/02/2019
HORA: 14:00
LOCAL: Sala para videoconferência do POP-RN
TÍTULO:

Uplift behavior of an instrumented helical pile subjected to cyclic loading in sandy soil.


PALAVRAS-CHAVES:

Helical pile, Instrumentation, Pull-out load test, Quasi-static loading, Sand.


PÁGINAS: 83
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Geotécnica
ESPECIALIDADE: Fundações e Escavações
RESUMO:

In this paper, the pull-out load behavior of instrumented helical piles subjected to cyclic loading in sandy soil is evaluated. The used pile had three bearing plates and was instrumented with resistance electric strain gauges in three sections along the shaft. Three pull-out load tests were performed, two with quasi-static cyclic loading and one with static loading, to verify the effects of cyclic loading. The tests with quasi-static loads were made with different values of average cyclic load and load amplitude. The results showed a great influence of the way in which the load increments were used due to the densification and disturbance of the surrounding soil. The accumulated displacements tended to stabilize after the 10th cycle, low rates of mean displacement accumulation were not obtained and the number of cycles before failure showed to be dependent on the average load and cyclic amplitude. With the instrumented sections, a reduction in residual cyclic rigidity was observed with the increase in depth along the shaft. Through the analysis of the mobilized loads in the bearing plates along the cycles, it was verified that the contribution to resistance from the lower bearing plate was responsible for most of the load capacity. It was also observed the influence of the interaction factors, which, by causing reloading of the pile, increased the soil rigidity and, consequently, reduced the corresponding displacements. Finally, the application of the quasi-static load cycles, in general, increased the static bearing capacity. In addition, the prediction method that approaches the value obtained in the load test was the individual bearing method.


MEMBROS DA BANCA:
Interno - 1515200 - JOSE NERES DA SILVA FILHO
Externo à Instituição - WILSON CARTAXO SOARES - UNIPÊ
Presidente - 2551234 - YURI DANIEL JATOBA COSTA
Notícia cadastrada em: 23/01/2019 14:11
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