Banca de DEFESA: EDUARDO DE CASTRO BITTENCOURT

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : EDUARDO DE CASTRO BITTENCOURT
DATA : 06/04/2018
HORA: 18:00
LOCAL: A DEFINIR
TÍTULO:

BEHAVIOR OF PILED RAFT ON SANDY SOILS


PALAVRAS-CHAVES:

Finite Element Method. Static Load Tests. Piled Raft.


PÁGINAS: 192
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

It is observed in the last decades, the search of the optimization
of pile foundations from the analysis of the benefit that the contact of the pile
cap or raft with the ground can confer to increase the load capacity and the
increase of the stiffness. Contribution that is not inserted in the design of the
foundation system by the traditional methodology of pile group. Thus, in the
present dissertation an analysis of the behavior of a foundation conceived by
the pile group methodology was carried out, in light of the piled raft, through
numerical modeling. The study work is from Instituto Cérebro, located in the

Central Campus of the Federal University of Rio Grande do Norte (UFRN),
Natal-RN. Theoretical and experimental studies, highlighting pioneering and
more recent searchs on the theme of this work, were used as subsidies to
present the state of the art of foundations in piled raft. The study foundation
consists of bored piles of the continuous flight auger, composed of lengths of
15, 17 and 20 m and diameters of 250, 400 and 500 mm. For the analysis of the
behavior of this foundation, the numerical program PLAXIS 3D Foundation,
based on the Finite Element Method (FEM), developed by Delft University (Delft
University of technology) was used. To verify if the program was handled
correctly, the verification of the software was done through comparative
analysis of cases previously studied by other researchers. The program input
data and back-analysis of soil geotechnical parameters were subsidized by
Standard Penetration Test (SPT), carried out in the field according to the
procedures recommended by NBR 6484/2001 and static load tests (PCE),
carried out according in NBR 12131/2006. The local subsoil, which was
modeled assuming its elastic behavior perfectly plastic, is formed by layers of
fine and medium sand, little compact silt, until reaching the impenetrable. The
water level was not detected in any of the 13 boring performed. It was observed
in the results obtained that the interaction of the pile cap with the soil increased
the load capacity and stiffness of the system. The pile cap presented up to 21%
contribution in receiving the efforts applied in the foundation. In addition, it has
been observed that the load capacity of the piled raft foundation system is not
confined to the algebraic sum of the isolated resistances of the pile cap and
pile(s). Considering these results, it can be concluded that the methodology of
foundation in piled raft is configured as a positive foundation technique for the
city of Natal for medium-sized buildings.


MEMBROS DA BANCA:
Interno - 1149451 - OLAVO FRANCISCO DOS SANTOS JUNIOR
Presidente - 1692497 - OSVALDO DE FREITAS NETO
Externo à Instituição - RENATO CUNHA - UnB
Notícia cadastrada em: 19/03/2018 11:32
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