Probabilistic assessment of ACI 318 minimum thickness requirements for two-way slabs

IF 0.9 Q4 ENGINEERING, CIVIL

Australian Journal of Structural Engineering Pub Date : 2022-10-19 DOI:10.1080/13287982.2022.2134354

Khaled Ahmat, Samer M. Barakat, S. Altoubat, Mohamad Alhalabi

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引用次数: 1

Abstract

ABSTRACT Following the ACI 318 design code and to control deflections, structural engineers must adhere to minimum thickness requirements for reinforced concrete (RC) slabs. However, these requirements do not account for various influencing variables such as span length, aspect ratio and applied live load. This paper assesses the adequacy of the ACI 318 minimum thickness requirements for two-way RC slabs through a probabilistic approach using Monte Carlo simulation (MCS). The probability distribution of the span-to-depth ratio (SDR) was fitted to the Burr distribution, and the goodness-of-fit test was applied to assess the fitting. Then, the effect of span length, aspect ratio, and live load on the maximum allowable SDR was evaluated, considering all material properties and applied loads as random variables. The analyses have shown a high correlation between the studied variables and the SDR. Therefore, multiple regression analysis was carried out, and four prediction models were proposed to conservatively predict the SDR for two-way slabs. The accuracy of the prediction models was statistically tested by comparing calculated to predicted SDR values, and a 10% maximum relative error was exhibited. The proposed prediction models were accurate for all practical ranges of span length, aspect ratio and live load in two-way slabs.

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双向板aci318最小厚度要求的概率评估

遵循ACI 318设计规范和控制挠度，结构工程师必须遵守钢筋混凝土(RC)板的最小厚度要求。然而，这些要求没有考虑到各种影响变量，如跨度长度、纵横比和施加的活荷载。本文通过使用蒙特卡罗模拟(MCS)的概率方法评估双向RC板的ACI 318最小厚度要求的充分性。将跨深比(SDR)的概率分布拟合到Burr分布，并采用拟合优度检验对拟合结果进行评价。然后，考虑所有材料性能和外加荷载为随机变量，评估跨长、纵横比和活载对最大允许SDR的影响。分析表明，所研究的变量与SDR之间存在高度相关性。为此，进行多元回归分析，提出4种预测模型对双向板SDR进行保守预测。通过计算值与预测值的比较，对预测模型的精度进行了统计检验，最大相对误差为10%。所提出的预测模型对双向板跨长、宽高比和活荷载的所有实际范围都是准确的。

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

Australian Journal of Structural Engineering ENGINEERING, CIVIL-

CiteScore

2.50

自引率

0.00%

发文量

期刊介绍： The Australian Journal of Structural Engineering (AJSE) is published under the auspices of the Structural College Board of Engineers Australia. It fulfils part of the Board''s mission for Continuing Professional Development. The journal also offers a means for exchange and interaction of scientific and professional issues and technical developments. The journal is open to members and non-members of Engineers Australia. Original papers on research and development (Technical Papers) and professional matters and achievements (Professional Papers) in all areas relevant to the science, art and practice of structural engineering are considered for possible publication. All papers and technical notes are peer-reviewed. The fundamental criterion for acceptance for publication is the intellectual and professional value of the contribution. Occasionally, papers previously published in essentially the same form elsewhere may be considered for publication. In this case acknowledgement to prior publication must be included in a footnote on page one of the manuscript. These papers are peer-reviewed as new submissions. The length of acceptable contributions typically should not exceed 4,000 to 5,000 word equivalents. Longer manuscripts may be considered at the discretion of the Editor. Technical Notes typically should not exceed about 1,000 word equivalents. Discussions on a Paper or Note published in the AJSE are welcomed. Discussions must address significant matters related to the content of a Paper or Technical Note and may include supplementary and critical comments and questions regarding content.