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Study on Nonlinear Vibration Test of Foundation Pile’s Integrity

Author: PengHuaZhong
Tutor: HuChunLin
School: Wuhan University of Technology
Course: Geotechnical Engineering
Keywords: Pile Foundation Detect Nonlinear Integrity Galerkin method Poincare section Branch Chaos
CLC: TU473.1
Type: Master's thesis
Year: 2005
Downloads: 177
Quote: 1
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Abstract


Pile foundation is an important infrastructure in the form of the building, is now widely used in high-rise buildings, railway bridges, nuclear power plants, offshore oil platforms, docks and large dynamic machine foundation engineering. Large pile in offshore engineering and harbor engineering structures the strong adverse sea conditions under dynamic loading into the nonlinear state and endanger the safety of the structures, accurate pile integrity testing is undoubtedly important. Pile longitudinal vibration theory is the theoretical basis of the dynamic test pile method to carry out the study of this theory is very important to further clarify the mechanism of dynamic test pile, the correct analysis and interpretation of the dynamic test pile curve. Currently, research in this area, most of the pile-soil system is linear. More prominent diagnostic object of nonlinear, linear vibration theory-based defect analysis and diagnosis and prediction methods may not only lead to quantitative error and, more importantly, will ignore the defect is closely related to the system non-linear The sexual dynamic behavior, and thus not conducive to accurate diagnosis pile, even misdiagnosis. This paper the use of linear and non-linear dynamics, linear and non-linear model of single pile under axial force analysis to find out to play a leading role in the mechanical behavior of single pile axial force factors. The combination of theoretical analysis and numerical simulation to illustrate the theory of rationality, and also prove the reliability of numerical simulation. Work and characteristics of this study are as follows: (1) summarizes the status quo at home and abroad at this stage Pile Integrity strain detection with the problems. Pile foundation longitudinal vibration frequency analysis and time-domain analysis. (2) Based on the pile foundation wave theory, starting from the wave equation of the pile - soil system together, combined with the initial conditions, boundary conditions for export complete pile of transient speed response model, and derived the frequency domain of pile foundation vibration response characteristics, and provides a basis for the analysis of the frequency domain response curve. Defective piles (3) consider the pile for a variable cross-section, the establishment of the defective piles pile and soil model, the Laplace transform and transfer impedance function, obtained a homogeneous soil in the pile to the top of the pile impedance resolve any exciting force semi-analytical expressions, and thus obtained a half sine pulse speed response, and finally obtained a semi-analytical solution for any segment speed of response of the pile with variable sections; based on the preparation of the corresponding program, using Matlab to study the pile soil damping constants, defect levels, pile stiffness on the vibration characteristics of the law, for practical engineering test. (4) focuses on the analysis of the nonlinear dynamics, chaos numerical identification method for solving nonlinear dynamic equations GalerkiIl method and Runge - Kutta method.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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