Soil-structure dynamic interaction（SSDI） is an important content of earthquake engineering and earthquake resistance of engineering structures.However

very few researches have been done on SSDI under blasting vibration so far.A 3D element model of Pile-soil-structure interaction（PSSI） system was developed using finite element software ANSYS/LS-DYNA.Blasting seismic wave is inputted on the tip of pile and better results are achieved.The results show that the displacement

acceleration and shear stress at piles top are larger than those at piles tip

and the distribution laws are inverted triangles.The connections of pile and pile cap are vulnerable to damage.PSSI system sustains its vibration after the impact of blasting seismic waves

but the effect of the vibration is smaller than the blasting seismic waves does

which roughly conforms to the measured results.What’s more

under the impact of blasting seismic waves

the contact pressure between soil and pile is relatively large at top of the corner pile.However

after the impact of blasting seismic waves

the contact pressure at top of the center pile is relatively large.Meanwhile

the contact pressure between soil and pile has certain periodic regularity until it attenuates to zero