Effects of fly ash column treatment of HP clayey soils on seismic behavior of R/C structures

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Baran Toprak, S. Bas, I. Kalkan
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引用次数: 1

Abstract

The behavior of soil directly affects not only its stability condition but also structural response of structural systems. High-plasticity clay soil (CH) is vulnerable to volumetric swelling leading to different settlements in structural systems. Hence, it becomes indispensable to propose practical solutions to reducing this effect. In the present study, structural response of R/C frame buildings, resting on high plasticity clayey soils strengthened through the coal fly ash column technique, to earthquake motion is investigated. For this aim, the swelling behavior of high plasticity clay soil (CH) is identified with in-situ experimental tests on the regions with high swelling potential in the city of Kirikkale, Turkey. In order to reduce the swelling potential of the investigated regions, the coal fly ash column technique was implemented to the reference soil specimen with high swelling percentage of 15.6%. Experimental results obtained from the strengthened soil specimens were compared to those from the reference specimen. This comparison revealed that the coal fly ash column approach has a considerable effect on improving the swelling behavior of the high plasticity clay soil. The decrease in the volumetric swelling value is also thought to directly improve the response of a building structure settled on high plasticity clay soil. The improvement in the seismic response of existing R/C structures located in the regions with high swelling potential was identified by adopting the increased allowable bearing pressure value of the improved soil in the analyses. Based on the comparative study, structural earthquake response of R/C frame systems was investigated on the basis of the engineering parameters, including the base-shear force, base overturning moment, base axial force and settlement of foundation. The percent changes in these values showed that the base axial force and settlement of foundation were improved with the help of this strengthening application.
粉煤灰柱处理HP粘土对R/C结构抗震性能的影响
土的特性不仅直接影响到土的稳定状态,而且直接影响到结构体系的结构响应。高塑性粘土易受体积膨胀的影响,从而导致结构体系的不同沉降。因此,有必要提出切实可行的解决方案来减少这种影响。本文研究了采用粉煤灰柱加固高塑性粘土地基的R/C框架结构在地震作用下的结构响应。为此,通过对土耳其基里卡莱市高膨胀潜力区域的现场试验,对高塑性粘土(CH)的膨胀行为进行了识别。为了降低研究区域的膨胀势,对膨胀率高达15.6%的参考土样采用了粉煤灰柱技术。将加固土试件的试验结果与参考试件进行了比较。结果表明,粉煤灰柱法对改善高塑性粘土的膨胀特性有相当大的作用。体积膨胀值的降低也被认为直接改善了建筑结构在高塑性粘土上的响应。在分析中采用改良土提高许用承载压力值,发现位于高膨胀潜力区域的既有R/C结构的地震反应得到改善。在对比研究的基础上,以基础剪力、基础倾覆力矩、基础轴力、基础沉降等工程参数为基础,研究了R/C框架体系的结构地震反应。这些数值的百分比变化表明,该加固措施改善了地基的基底轴力和沉降。
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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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