Response of micropiles in different seismic conditions

In recent years, due to the growth of the world population, suitable lands for construction and building are being reduced, gradually; hence, researchers have continuously sought to increase the bearing capacity and resistance of soil and improve its properties. One of the effective methods for improvement of the soil bearing capacity and reduction in foundation settlement is the implementation of micropiles below them. In this study, the seismic response of micropiles under real seismic loading was performed using finite element software. The stabilized soil behavior was modeled as elastoplastic along with Rayleigh damping, and micropiles were modeled as elastic beam elements by considering the interaction between soil and structure. The parametric study aims to focus on how to connect micropiles with foundation and effect of earthquake intensity. The results of the analysis show that decreased stiffness of the micropiles foundation system against the applied forces affects the values of lateral displacement and bending moment. Also, it is found that the Arias intensity of an earthquake is important parameter in characterizing of an earthquake nature influence on pile performance in soil.