Bridge pile foundation anti-earthquake analysis simplified method considering whole soil liquefaction process

Abstract

The invention belongs to the technical field of geotechnical engineering and foundation engineering and relates to a bridge pile foundation anti-earthquake analysis simplified method considering the whole soil liquefaction process in the field of earthquake engineering. The method comprises the steps that a model calculation parameter reasonable determining method and a concrete expression are given out by building a liquefied site pile-soil earthquake interaction macrocell model which well considers the influence on a soil spring of the pile-soil earthquake interaction from sand liquefaction and is used for achieving the process of the pile-soil earthquake interaction; then based on a non-linear Winkler foundation beam model, the built macrocell model is adopted, mass inertia force of soil, participating in vibration, around a pile, inertia force of an upper structure, radiation damping of soil and other effects are considered, a liquefied site pile-soil-bridge beam structure earthquake interaction simplified analysis model is built, soil movement and pore pressure ratio time interval obtained by implementing free liquefaction site power analysis serve as numerical model external input and are used for liquefied site pile-soil earthquake interaction problem analysis, and a new analysis method is provided for actual liquefied site bridge pile foundation anti-earthquake design.

Description

technical field [0001] The invention relates to a simplified method for seismic analysis of bridge pile foundations in the field of geotechnical engineering for considering the whole process of soil liquefaction. Background technique [0002] As an important means to evaluate the seismic performance of bridge pile foundations in liquefied sites, model tests cannot be widely used due to their own limitations. At present, precise numerical methods such as finite element method and finite difference method have become important methods for seismic response and seismic analysis of bridge pile foundations in liquefied sites. However, due to the difficulty in selecting calculation parameters, the complexity of numerical modeling, and the difficulty in evaluating the reliability of calculation results, these numerical methods have been greatly limited in practical engineering applications, and have become the secondary choice of engineers. The simplified method for seismic analysi...

AI Technical Summary

Problems solved by technology

However, the current conventional p-y curve method sometimes cannot accurately describe the pile-soil seismic interaction response in liquefied sites, such as soil softening caused by soil pore pressure increase, soil radiation damping, friction between pile side and soil, and pile Cracks that may appear at the soil interface, etc.

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