چكيده به لاتين
Deep foundations or piles are frequently used where the surface soil is weak or design loads are considerable. Among the different types of piles, utilizing batter piles is more frequent when lateral loads, as well as dynamic earthquake load, are the primary concern. Although in some cases in the past earthquakes detrimental performance of batter piles is reported, some recent studies show that using these piles could be beneficial in case they are properly designed. Therefore, to reach the most optimal and economical design to cope with lateral loads understanding the dynamic behavior of groups with batter piles is of particular importance.
The present dissertation examines the behavior of vertical and batter piles in different configurations under sinusoidal dynamic load using shaking table modeling along with numerical models evaluated based on the results of shaking table experiments. For both experimental and numerical modeling, the effects of inertial interaction are considered by placing a one-degree-of-freedom structure on the pile group.
As the main purpose of this study, with the help of numerical modeling, parametric studies have been performed on various variables such as angle and direction of batter piles in the group that affects the dynamic response of the piles. The results of this study show the beneficial performance of the inclined pile with an angle of 15 degrees, under the sinusoidal excitation with a frequency of 7 Hz and amplitude of 0.2 times the ground acceleration, which leads to a 57% reduction in horizontal cap displacement and 32% reduction of bending moment at the head of the batter pile in comparison with vertical piles.
