This paper is presented the lateral dynamic response of pile groups embedded in dry sand under influence of vertical loads and the pile shape in-group, which are subjected to the lateral two-way cyclic loads. The laboratory typical tests with pile groups (2×1) have an aluminum-pipe (i.e. circular, square) pile, embedded length to diameter of pile ratio (L/D=40) and spacing to diameter ratio (S/D) of 3, 5, 7 and 9 are used with different cyclic-load ratio (CLR) 0.4, 0.6 and 0.8. The experimental results are revealed that both the vertical and lateral pile capacity and displacement is significantly affected by the cyclic-loading factors i.e. (number of cycles, cyclic load ratio, and shape of pile) .In this study, important design references are presented. Which are explained that the response of the pile groups under cyclic lateral loading are clear affected by the attendance of vertical load and pile shape. Where, it is reduction the lateral displacement of group piles head and increase lateral capacity about (50) % compared without vertical loads. On the other side, the pile shape is a well affected to the pile response where the level of decline in lateral displacement at the pile groups head in the square pile is more than circular pile about 20 % at the same load intensity.
Many previous studies have mainly investigated only the effect of cyclic loading on the behaviour of group pile without taking in to account the influence of axial load in the other mean (without the effect of vertical load on the behaviour on the group pile), which is represented most realistic case. In addition, due to the large number of variables in soil and piles, which make these studies not fully understood, so deep studies of the behaviour of the group pile is needed. This study aiming to knowing the effect of axial load and piles shape on the performance of piles group under cyclic loads and identifying the best configuration of piles also to study the effect of pile spacing on lateral displacement under pure and combined loading. by developing cyclic laboratory system that can test the pile of group. Aluminium pile with slenderness ratio L/D of 40 in-groups (1×2), (2×1) is used in this study. The most important results explained that the presence of vertical loads on the pile group cap according to allowable vertical load capacity and the pile shape have positive effect. Where it is reducing the lateral displacement of the head group pile a rounded of 60 %and 30% respectively.
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