Abstract:

In this paper,based on the shaking table tests for the dynamic interaction of squeezed disk pile-soilframe structure,the seismic performances of the squeezed disk pile and the straight pile systems are investigated with MARC software. The results show that squeezed disk piles bear alternating pull and compression loads due to the building swing in an earthquake,which produces pull＂stress bubbles＂in disk-upper soil that grow with the la teral displacement of the structure top. It is thus concluded that the uplift force is mainly transferred through the disks that effectively dissipate some seismic energies and reduce the swing of the upper structure. Moreover,it is demonstrated that the anti-pulling force of squeezed disk piles derives from the side friction resistance of the pile and the end resistance of the disks,and that,with the increase of dynamic load,the disk becomes the main way to load transfer.

Key words: stress bubble, shaking table test, anti-pulling, seismic analysis, numerical simulation