nalysis and Parametric Study of Load-displacement Behavior of Large Group Pile Under Lateral Loading
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Date
2019-04-14
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Addis Ababa University
Abstract
Investigating the effects of lateral loads in design of foundation is important as compared
to axial loads, although it gets normally less consideration in the usual practice. This
study investigates the behavior of group piles in terms of load - displacement curves for
trailing, intermediate and leading rows when it is laterally loaded by using FEM analysis
employing Plaxis 3-D FOUNDATION. Mohr-Coulomb model has been used to model
the soil material. A 15-noded triangular element is executed while 3-D meshing for soil
material. The soil parameters were taken from previously done thesis, which has been
calibrated from local soil property. Structural materials were modeled by using linearelastic
model, since steel and concrete behaves elastically under loading. Parameters
which has been considered were pile geometry such as pile length/depth, spacing and
pile number (number of rows) with different loading step. In addition, the pile is fixed
head system, but the effects of pile cap have not been considered, only used for
distributing lateral loads equally. It has been found out that pile group lateral
deformations are small when the pile spacing is large enough, while the number of piles
in the group increases, lateral movement of leading rows are decreasing. This is due to
the overlapping shearing zones of the intermediate rows. When depth of piles increases
there is increment of lateral confinement because of the increment of over burden
pressures. It is concluded for the laterally loaded group of piles; the leading rows can
resist more reaction loads from the soil than the trail rows and deformed less than the
trail and intermediate rows. Finally based on the parameter analysis the difference of row
displacement of leading, intermediate and trailing row were from 4% up to 8%, 9% up to
14%, 15 up to 20% respectively of total pile movements.
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Keywords
Lateral Loading, Loaddisplacement, Pile, Parametric Study