The Effect of Irregular Seismic Loading and Soil Density on the Liquefaction Behavior of Saturated Sand

IF 1.4 4区工程技术 Q3 ENGINEERING, CIVIL

Periodica Polytechnica-Civil Engineering Pub Date : 2023-07-11 DOI:10.3311/ppci.21846

Bahareh Katebi, A. Ghalandarzadeh, M. Derakhshandi, N. Ganjian

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引用次数: 0

Abstract

Structures located on sandy soils can be significantly damaged by earthquake-induced liquefaction. A series of stress-controlled cyclic triaxial tests under harmonic and irregular loading under various soil densities 30%, and 50%, was conducted to evaluate the effects of irregularities and relative densities on the liquefaction characteristics of saturated sand. The irregular actual ground motions time histories obtained from six stations of the 1999 Chi-Chi Earthquake and harmonic sinusoidal cyclic loading time histories were applied to Firoozkooh #161 sand specimens, and the results were compared in terms of the type waveforms loading and relative densities. Based on the stress and energy method, the Correction coefficient is calculated for a variety of densities and types of irregular loading. The present results reveal that it is not precise to assume a single correction coefficient for all records, regardless of the complicated time-domain characteristics of ground motions. Furthermore, the results indicate that the relative soil density and the type of irregular loading influenced sand's pore pressure generation and liquefaction potential.

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不规则地震荷载和土密度对饱和砂土液化特性的影响

砂土上的结构在地震液化作用下会受到严重破坏。通过在不同土密度30%和50%条件下，进行谐波加载和不规则加载下的应力控制循环三轴试验，研究不规则和相对密度对饱和砂土液化特性的影响。将1999年集集地震6个台站的不规则实际地震动时程和谐波正弦循环加载时程应用于firroozkooh #161沙样，并对其类型波形加载和相对密度进行了比较。基于应力能量法，计算了不同密度和不同类型的不规则荷载下的修正系数。目前的结果表明，不考虑地面运动的复杂时域特征，对所有记录假定一个单一的修正系数是不精确的。结果表明，相对土密度和不规则荷载类型对砂土孔隙压力的产生和液化潜力均有影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Periodica Polytechnica-Civil Engineering 工程技术-工程：土木

CiteScore

3.40

自引率

16.70%

发文量

审稿时长

12 months

期刊介绍： Periodica Polytechnica Civil Engineering is a peer reviewed scientific journal published by the Faculty of Civil Engineering of the Budapest University of Technology and Economics. It was founded in 1957. Publication frequency: quarterly. Periodica Polytechnica Civil Engineering publishes both research and application oriented papers, in the area of civil engineering. The main scope of the journal is to publish original research articles in the wide field of civil engineering, including geodesy and surveying, construction materials and engineering geology, photogrammetry and geoinformatics, geotechnics, structural engineering, architectural engineering, structural mechanics, highway and railway engineering, hydraulic and water resources engineering, sanitary and environmental engineering, engineering optimisation and history of civil engineering. The journal is abstracted by several international databases, see the main page.