Complex heterogeneous soil internal tubular pile longitudinal vibration analysis method based on viscous damping model

Abstract

The invention discloses a complex heterogeneous soil internal tubular pile longitudinal vibration analysis method based on a viscous damping model, and belongs to the field of civil engineering theoretical analysis. The method comprises the steps that a tubular pile-soil coupling vibration system is divided into multiple layer sections in the longitudinal direction at first, pile periphery soil ineach layer section pile in the longitudinal direction is divided into an internal disturbance area and an external area in the radial direction, the internal disturbance areas are divided into multiple circle layers in the radial direction, soil in each circle layer is the homogeneity isotropy linear viscoelastic body, soil in the external areas is infinitely extended in the radial direction, andviscous damping is adopted for soil material damping; pile soil interfaces and circle layer soil interfaces are continuous in two-side displacement and balanced in stress, and pile soil system vibration is small deformation; pile body concrete is the liner linear elastic body, and transmission of stress waves in pile bodies meets plane cross-section assumption; and pile periphery, pile core soiland pile body longitudinal vibration equations are built, the three vibration equations are solved, and a time domain speed response function of any excitation force acting on pile tops is obtained through transfer performance of a pile body damping function among the longitudinal layer sections.

Description

technical field [0001] The method of the invention relates to the field of theoretical analysis of civil engineering, and more specifically relates to a method for analyzing the longitudinal vibration of pipe piles in radially heterogeneous and longitudinally layered soil based on a viscous damping model. Background technique [0002] The research on the coupled vibration characteristics of the pile-foundation interaction system in the longitudinally layered soil is the theoretical basis of engineering technology fields such as pile foundation anti-seismic design and pile foundation dynamic testing. Cross-cutting hot issues in the field of interaction. [0003] The study of pile-soil coupled vibration characteristics is the theoretical basis of engineering technology fields such as seismic design of pile foundations and dynamic testing of pile foundations, and has always been a hot issue in geotechnical engineering and solid mechanics. [0004] As we all know, in the proces...

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Problems solved by technology

However, for the problem of anharmonic vibration (transient vibration or random vibration), the hysteretic damping model is not suitable, especially when studying the time domain response of piles under transient excitation conditions, the soil damping force is also related to the amplitude Related to the strain rate, the use of the hysteretic damping model will cause contradictions in the concept, resulting in the so-called "non-causality of dynamic response", while the viscous damping model is more suitable and more reasonable in physics

[0009] In addition, most of the current research is carried out on solid piles, and for large-diameter tubular piles, due to the existence of pile core soil, there will inevitably be differences in vibration characteristics between them and solid piles.

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