土壤模型复杂性对浅基础地震反应的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Saif Alzabeebee
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引用次数: 14

摘要

浅基础的地震反应通常采用时程有限元分析。然而,文献中缺乏关于土本构模型复杂性对浅基础地震反应影响的研究。因此,本研究旨在通过采用线弹性(LE)模型、弹-完全塑性(EPP)模型和小应变刚度硬化土(HS small)模型研究干硅砂浅基础的地震反应来填补这一空白。之所以使用这些模型,是因为它旨在比较土壤本构模型的结果,该模型准确地捕捉了土壤-结构相互作用问题的地震反应(即HS小模型)与更简单的模型(LE和EPP模型),这些模型通常被岩土工程设计从业者使用。结果表明,LE模型产生的地震沉降值非常小,近似为零。EPP模型预测的地震沉降比HS小模型预测的地震沉降高,当相对密度为45%时,峰值地面加速度(PGA)小于0.25 g,当相对密度为70%时,峰值地面加速度小于0.40 g。在上述PGA值之外,HS小模型预测的地震沉降值高于EPP模型,两者之间的差异随着PGA值的增大而增大。结果还表明,LE和EPP模型预测地基正下方加速度-时间关系的趋势和幅度相似,但与HS小模型预测的结果不同。本文的研究结果为今后浅基础在地震作用下的响应数值研究提供了有益的参考依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of soil model complexity on the seismic response of shallow foundations
The time-history finite element analysis is usually used to evaluate the seismic response of shallow foundations. However, the literature lacks studies on the influence of the soil constitutive model complexity on the seismic response of shallow foundations. This study, thus, aims to fill this gap by investigating the seismic response of shallow foundation resting on dry silica sand using the linear elastic (LE) model, elastic-perfectly-plastic (EPP) model, and hardening soil with small strain stiffness (HS small) model. These models have been used because it is intended to compare the results of a soil constitutive model that accurately captures the seismic response of the soil-structure interaction problems (which is the HS small model) with simpler models (the LE and EPP models) that are routinely used by practitioners in geotechnical designs. The results showed that the LE model produces a very small seismic settlement value which is approximately equal to zero. The EPP model predicts a seismic settlement higher than that produced using the HS small model for earthquakes with a peak ground acceleration (PGA) lower than 0.25 g for a relative density of 45% and 0.40 g for a relative density of 70%. However, the HS small model predicts a seismic settlement higher than the EPP model beyond the aforementioned PGA values with the difference between both models increases as the PGA rises. The results also showed that the LE and EPP models predict similar trend and magnitude of the acceleration-time relationship directly below the foundation, which was different than that predicted using the HS small model. The results reported in this paper provide a useful benchmark for future numerical studies on the response of shallow foundations subjected to seismic shake.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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