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

A seismic analysis and whole-process technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inability to accurately describe pile-soil seismic interaction responses in liquefied sites

Inactive Publication Date: 2015-03-25
唐亮 +1
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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 sof

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

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Embodiment Construction

[0014] The present invention also provides the implementation steps of the simplified method for seismic analysis of bridge pile foundations considering the whole process of soil liquefaction, as follows:

[0015] (1) Through the time-domain analysis of the effective stress of the free liquefaction site, the displacement time history of the soil layer along the buried depth and the time history of the pore pressure ratio of the sand layer are obtained.

[0016] (2) Establish a simplified analysis model of pile-soil seismic interaction. In the model, the superstructure is simulated as a concentrated mass point, and the pile is simulated as a beam unit. The mass of the pile is concentrated on the pile node (on the interface of different soil layers), and the mass of the vibrating soil around the pile is added to the node of the pile (the concentrated mass of the pile system) constitutes a new concentrated mass system for piles, in which the vibration-parametric mass is selected ...

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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...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 唐亮凌贤长
Owner 唐亮
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