Calculation Study Of Seismic Pile-Soil-Structure Interaction In Liquefiable Ground

The damage of pile is hard to repair and will seriously affect the later use of thestructure. At present, the research on pile-liquefied soil structure dynamic interactionunder eathquake action is wildly studyed at Home and Abroad. But there is still acoincident conclusion, although big progress has been achieved. The m method hasbeen used to calculate the pile-liquefied soil structure dynamic interaction in China,which is simple and swift, but the accuracy still need further research.In this paper, the m method and P-Y method are used to calculate pile-liquefiedsoil structure dynamic interaction in different conditions. Concrete work is describedas follows:Seismic damage of the structure because of the liquefiable ground in someerthquakes has been introduced. The understanding of pile-liquefied soil structuredynamic interaction at Home and Abroad has been summarized; Structure modes withdifferent liquefaction degree and overburden are calculated and analysised. Thedifference of results between m method and P-Y method are compared. The analysisof the pile-liquefied soil structure dynamic interaction with plastic hinge in pier hasalso been studyed.The calculation results show that the internal force of the pile is decreased inliquefaction phenomena by use of both m method and P-Y method. Generally, Theinternal force decrease with the increase of liquefaction degree. M method is moreconcise than P-Y method and the calculation results are almost the same. So mmethod is practical. The plastic hinge could protect the pile under earthquake, whichneed to be designed carefully. The internal force is not decrease with the increase ofliquefaction degree because of the hinge. Pile liquefied soil dynamic coupling isneglected in m method and P-Y method. The result is not in accord with someearthquake damage survey. They need to be improved in the further research.