Dynamic Analysis of Pile-Soil-Structure Interaction System under Blasting Load

Abstract

Using finite element software ANSYS/LS-DYNA, dynamic response of pile-soil-structure interaction (PSSI) system under blasting load was analyzed, and the effects of blasting load on surrounding buildings foundation and superstructure were studied. This can provide a reference for structural and seismic reinforcement under blast loading. The results show that the every floor’ acceleration of superstructure of PSSI system along the vertical direction is usually larger than the value along the horizontal direction under horizontal explosion load. Peak-acceleration along the vertical direction decreases from the lowest layer to the top and peak-acceleration along the horizontal direction decreases and then increases with the increase of layer. The top peak-shear stress of piles is larger than the tip of piles, and the distribution laws are inverted triangles. The maximum values of peak of pile-soil contact pressure are located on the top of the piles. With little change in height and contact pressure plummeted. Contact pressure increases more near the tip of the piles.