Seismic Response Analysis Of Elevated Pile Foundation On Pile-soil Interaction

The elevated pile caps infrastructure which is very common a bridge foundation structurehave been used in large span bridge structure and mountain bridge The high pile capinfrastructure is often easy to damage, This paper considers the high pile cap structure of thepile length on the structure of the unearthed free influence. First the seismic response analysiswith static response analysis of the elevated pile caps infrastructure based on pile soilinteraction has been compared, and then the pile of freedom of the structure length unearthedof seismic response was analyzed in bad earthquake, The main contents include:This paper first discusses the test and numerical calculation model method of analysis ofpile soil interaction, Then for the soil constitutive model used in finite element analysis issummarized in this paper; The pile soil interaction system structure analysis of soilconstitutive model, the upper structure of the constitutive model and soil and structure of thedynamic interaction finite element analysis solution are ascertained. Set up a high bridge pierfoundation pile bearing platform of 2d analysis model, in consideration of the soilrespectively nonlinear and pile soil contact problem of system under the condition of static.The structure of the dynamic characteristics of the change has been analyzed in the badearthquake, The structure of high piers displacement and pile body piers displacement andpile body axial force, shear and moment has been comparison analysis in two different loadcases. The influence on the seismic response of the high pile pier foundation piles of the freelength of high pile has been analyzing.The following conclusion has been obtained: Under the effects of seismic the structuredisplacement and acceleration corresponding has been amplified along with the height of thestructure itself increasing, and at the same time the displacement and acceleration has been inthe top of the maximum value; Structure of seismic response of the system changes along thedirection has nothing to do with level. High pile bearing platform structure of the naturalvibration period length has been increased by the increase of the high pile pier foundation pileof length freedom, the structure stiffness has been become low and the flexibility has beenincreased; Along with the increase of the free length, acceleration amplification coefficienthas been reduced. And it has been obtained that there is no rule for the feature pile top internalforce change in cross section through the static structure and seismic response analysis, but under the effects of earthquake in the calculation model of pile group the internal force middlepile of the cross section is the smallest and the right is the maximum. The change of freelength has influenced displacement rate of the structural system along the height direction.The displacement rate of the pile in the soil will increase along the height of the pile, and thedisplacement rate of the superstructure will decrease.