Reinforcement the Seismic Interaction of Soil-Damaged Piles-Bridge by Using Micropiles

This paper presents Three-dimensional numerical modeling of Soil-damaged Piles-Bridge interaction under seismic loading. This study focuses on the effect of developing plastic hinges in piles foundation on the seismic behavior of the system. In particular, this study is interested in evaluating the proposed approach for strengthening the system of soil-damaged piles-bridge. The proposed approach is based on using the micropiles whose significantly promoting the flexibility and the ductility of the system. This study was carried out using a Three-dimensional finite differences modeling program (FLAC 3D). The results confirmed the considerable effect of the developing of concrete plasticity in the pile’s foundation, which reflects in changing the distribution of internal forces between the piles, also, they show the efficiency of using the micropiles as a reinforcement system. The detailed analysis of the micropiles parameters shows a slight effect of pile-micropile spacing, while the use of inclined micropiles leads to attenuation of the internal forces induced in the piles and the micropiles themselves.