Numerical Analysis of Inclined Micropiles Behavior Under Seismic Load

    Abstract:  Performing human made that lead to structures damages have occurred due to earthquakes and seismic load. Studying the existing structures and the methods of retrofitting has an important role in earthquake-prone countries. Nowadays, micropiles are commonly used in structures as a practical element to retrofit the seismic behaviors. In this paper, inclined micropiles under the earthquake load were analyzed by finite difference method using FLAC 3D. The approach considers an idealization for micro pile-soil system in three dimension model in order to evaluate logically their behaviors when the earthquake occurs. The micropile is assumed to be linear elastic and the soil  is elastoplastic  material. The micropile’s  failure is controlled  by the  Mohr -Coulomb criterion and all the micropiles were analyzed on the load of earthquake recorded in Tabas, Iran, 1978. The results obtained from the numerical analyses were compared with available other data, indicating a satisfactory agreement. The  results show  that the  inclined micropiles, due  to being  in the  soil, give  more hardness to it. So these cause less displacement in comparison with vertical ones. Also the micropile-soil interactions in .performance of inclined one were salient

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