Behavior of Piled Raft Foundation in Clay Subjected to Lateral Cyclic Loading
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Abstract
The popularity of piled raft foundations is on the rise due to their cost-saving advantages in construction. These foundations not only enhance the efficiency of pile foundations but also reduce the number of required piles. This becomes particularly crucial when considering the ability of foundations to withstand lateral cyclic loads such as those induced by earthquakes, wind loads on tall buildings, or wind turbines. Therefore, it is imperative to comprehend the behavior of piled rafts under lateral loads, especially the complex and challenging analysis of cyclical lateral loads. The finite element method proves instrumental in analyzing such intricate behaviors. This research employed a 3D finite element model to investigate the behavior of piled raft foundations under cyclic lateral loading in clay soils. The study involved varying the pattern of lateral cyclic loading, frequency, and number of cycles. The findings indicated that the lateral load behavior of piled rafts was significantly influenced by cyclic loading, leading to a decrease in lateral load capacity as the number of cyclic force cycles increased, and the frequency magnitude changed. This behavior is attributed to the permanent soil deformation surrounding the piles and beneath the raft. The value of the locked-in moment in piles, when the lateral load was withdrawn to zero, will increase with the increasing number of cycles.
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