Research On Axial Random Vibration Performances Of Piles With Random Parameters

Pile foundation is a kind of important foundation form of building, Which is extensively used in high-rise building railway bridge, nuclear power stations, marine platform, coast dock and large dynamical machine foundation. For example, the pile foundation of buildings near sea and above sea under hard dynamic loads gets to complex state and endangers buildings. Therefore the study of accurate vibration state of pile foundation is very important.For most construction methods and design theories are based on some assumptions, and also the interaction of pile-soil is quite complex, all of those resulting in uncertainties and stochastic of material piles and soil in the vibration process, so the variability of pile performance comes out. It has been studied that, sometimes, the random parameters of piles will make a good role. If certain model is still applied to study the vibration performance, the conclusion will be false. The code for seismic design of pile only made some details of seismic design, the lack of gender, especially, without involving confidence level. Mainly, because of the subject is too difficult. Up to now, just the linear random vibration, single-mode-system and nonlinear random system with few degrees of freedom are studied. And all these methods could not be used in the fields of nonlinear random vibration. Therefore, the exploration of nonlinear random vibration with random parameters has engineering background and great academic value, and it is of theoretical significance as well.Longitudinal vibration theory of pile is the basis of any kind of method in dynamic pile testing, which can be used to explain the dynamic reaction between pile and soil, the mechanics of pile testing, and to illustrating the pile testing curves.The main research and unique feature are as follows:(1) The development history of piles and stochastic vibration study of structure with random parameters are summarized, and some uncertainties of piles, which are produced in the design and construction, are well expounded. So the necessity of stochastic vibration problem of piles with random parameters is well expounded.(2) Some fundamental theories of Monte-Carlo are introduced, and by the well known problem of Buffoon, basic principle of Monte-Carlo is represented. And the...