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The Dynamical Responses of Base-Isolated System with Soft Soil Base under Earthquake Situation

Author: XiangZheng
Tutor: ZhaoBin
School: Tongji University
Course: Structural Engineering
Keywords: Soil - structure interaction Base Isolation Lead rubber bearings Foundation model
CLC: TU352.12
Type: Master's thesis
Year: 2006
Downloads: 261
Quote: 4
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Abstract


This paper first reviews the structure of control and base isolation Research , which focuses on considering soil - structure interaction on base isolation research profile and considering soil - structure interaction analysis of seismic base isolation necessity . Gave a brief introduction to the foundation model commonly used in the soil - structure interaction , simplified mechanical model of the existing research and its conclusion summarizes the dynamic finite element analysis of the basic steps of reconciliation value the method of the equation . Calculated by finite element model , a detailed study of the fundamental frequency and dynamic response regularity of the soft ground under the lead core rubber bearings base isolation system . A comparative analysis of the calculation model considering soil - structure interaction of non - isolated structure model (OS), without considering soil - structure interaction isolated structure model ( BIS ) , considering soil - structure interaction isolated structure model (BIS-SSI), considering soil - structure interaction of non- isolation model (OS-SSI) four categories . Consider the impact of changes of the the the different isolation layer parameters or the foundation soil parameters in various models . History analysis of seismic waves , respectively, entered El Centro wave , and Shanghai artificial wave are compared . Through the analysis , the following conclusions : (1) the impact of the soft ground of the fundamental frequency of the isolated structure is much smaller than the impact of the soft ground of the fundamental frequency of the non - isolated structure . ( 2 ) compared to the non - isolated structure on soft ground on the basis of isolated structure and soft ground in the earthquake , the isolation effect is not obvious ; isolation performance of medium and low compressibility of the soil on the basis of isolated structures less affected , the isolation effect is more significant . ( 3 ) earthquake rocking motion of the soft ground - lead rubber bearing isolation structure is more apparent.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Isolated structure
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