Age-dependent deflection analysis of reinforced concrete beams incorporating high volume fly ash: experimental and ANN modeling approach

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-04-14 DOI:10.1680/jmacr.23.00197

A. Hashmi, M. Shariq, A. Baqi, M. Ayaz, A. Bilal

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Abstract

The research examines the influence of high-volume fly ash (HVFA) on reinforced concrete (RC) beam deflections over 180 days of continuous loading. The study comprises eight fly ash-based concrete mixes with varying fly ash ratios (0-60%). Experimental assessments are conducted on two load levels, corresponding to 25% and 50% of the initial cracking load. Thirty-two full-scale RC beams, each measuring (100×150×1800) mm, are fabricated for both load levels. Long-term deflections are monitored for all concrete mixes through sustained four-point bending tests at ages ranging from 1 to 180 days. A comparative analysis of the overall mid-span deflection between conventional and fly ash concrete RC beams is carried out against established design codes. It has been determined that high volume fly ash RC beams exhibited lesser contribution to creep and shrinkage deflection compared with conventional RC beams. Moreover, ANN modeling has also been carried out to propose a significant model helpful in predicting the total deflection of RC beams containing any fly ash content and at any age of concrete. The present study offers valuable insights for engineers and designers, facilitating the evaluation of age-dependent deflection patterns in RC beams constructed with reinforced high-volume fly ash concrete.

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掺入大体积粉煤灰的钢筋混凝土梁随龄期变化的挠度分析：实验和 ANN 建模方法

该研究探讨了高体积粉煤灰（HVFA）对钢筋混凝土（RC）梁在 180 天连续加载过程中挠度的影响。研究包括八种不同粉煤灰比例（0-60%）的粉煤灰混凝土混合料。实验评估在两个荷载水平上进行，分别相当于初始开裂荷载的 25% 和 50%。针对这两种荷载水平制作了 32 根全尺寸 RC 梁，每根梁的尺寸为 (100×150×1800) 毫米。在 1 到 180 天的龄期内，通过持续的四点弯曲试验监测所有混凝土混合物的长期挠度。根据既定的设计规范，对传统混凝土和粉煤灰混凝土 RC 梁的整体跨中挠度进行了比较分析。结果表明，与传统 RC 梁相比，大体积粉煤灰 RC 梁的徐变和收缩挠度较小。此外，还通过 ANN 建模提出了一个重要模型，有助于预测任何粉煤灰含量和任何混凝土龄期的 RC 梁的总挠度。本研究为工程师和设计师提供了有价值的见解，有助于评估用大体积粉煤灰混凝土加固的 RC 梁随龄期变化的挠度模式。

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

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.