混凝土强度等级的动态演变:不同龄期和应变速率下的启示

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
Shiming Wang, Yunfan Bai, Yan Shen, Jian Zhou, Manoj Khandelwal
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引用次数: 0

摘要

本文研究了三种不同强度等级(即 C30、C40 和 C50)的素混凝土在早期龄期(分别为 3、7、14 和 28 天)的动态响应。使用直径为 75 毫米的霍普金森分压杆(SHPB)装置发现了显著的模式。最初,在混凝土的早期阶段观察到明显的粘弹性行为,其特点是在达到峰值之前和之后都有一条尖锐的应力-应变曲线。随着混凝土的成熟,应力-应变曲线中的应力集中变得更加明显。此外,随着应变速率的增加,动态强度呈指数增长,而应变速率指数则随着龄期的增加而降低。研究发现,提高混凝土质量可降低动态强度对应变速率的敏感性。根据实验分析建立了粘弹性损伤构成模型,以有效描述力学响应。通过将模型参数与实验数据拟合,准确地捕捉到了混凝土性能随时间的变化。根据该损伤模型得出的理论应力-应变曲线与不同龄期的实验曲线非常吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dynamic Evolution of Concrete Strength Grades: Insights Across Different Ages and Strain Rates

Dynamic Evolution of Concrete Strength Grades: Insights Across Different Ages and Strain Rates

This paper investigated the dynamic response of plain concrete with three different strength grades, namely C30, C40, and C50, at an early age (3, 7, 14, and 28 days, respectively). Significant patterns were uncovered using a 75-mm-diameter split Hopkinson pressure bar (SHPB) apparatus. Initially, pronounced viscoelastic behaviour was observed in the concrete’s early stages, characterised by a sharp stress-strain curve both before and after reaching its peak. As the concrete matures, stress concentration within the stress-strain curve becomes more pronounced. Additionally, exponential growth in dynamic strength with higher strain rates was observed, while the strain rate index decreased with age. Improving concrete quality was found to reduce the sensitivity of dynamic strength to strain rate. A viscoelastic damage constitutive model was formulated based on experimental analysis to describe the mechanical response effectively. The evolution of concrete properties over time was accurately captured by fitting model parameters to the experimental data. The theoretical stress-strain curves derived from this damage model closely matched experimental curves across various ages.

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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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