Study on the size effect of dynamic tensile strength in lightweight concrete using Leca aggregates at the mesoscopic level

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-06-20 DOI:10.1016/j.dibe.2024.100487

Bin Wang , Chunqi Zhu , Eryu Zhu , Zhu Zhang , Guosen Ji

{"title":"Study on the size effect of dynamic tensile strength in lightweight concrete using Leca aggregates at the mesoscopic level","authors":"Bin Wang , Chunqi Zhu , Eryu Zhu , Zhu Zhang , Guosen Ji","doi":"10.1016/j.dibe.2024.100487","DOIUrl":null,"url":null,"abstract":"<div><p>To investigate the influence of volume fraction of lightweight aggregate concrete on dynamic tensile strength and size effect, theoretical derivation and microscopic numerical simulation are combined in this study, and a dynamic hybrid fracture cohesive zone constitutive model for lightweight aggregate concrete to characterize the tensile behavior considering strain rate at microscopic scale. The research reveals that, for geometrically similar specimens of various sizes, the direct tensile strength with different aggregate volume fractions exhibits differing degrees of improvement with increasing strain rates. The tensile strength gradually decreases as volume fraction increases. The established coupling function incorporating strain rate, specimen size, and aggregate volume fraction accurately characterizes the dynamic tensile strength variation. In addition, a theoretical framework is proposed to provide a microscopic understanding of the static-dynamic size effect. This framework facilitates the estimation of the dynamic tensile strength under specific volume fraction, specimen size and strain rate conditions.</p></div>","PeriodicalId":34137,"journal":{"name":"Developments in the Built Environment","volume":"19 ","pages":"Article 100487"},"PeriodicalIF":6.2000,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666165924001686/pdfft?md5=ab902e81171e9f8558ead35a40d678cf&pid=1-s2.0-S2666165924001686-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Developments in the Built Environment","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666165924001686","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

To investigate the influence of volume fraction of lightweight aggregate concrete on dynamic tensile strength and size effect, theoretical derivation and microscopic numerical simulation are combined in this study, and a dynamic hybrid fracture cohesive zone constitutive model for lightweight aggregate concrete to characterize the tensile behavior considering strain rate at microscopic scale. The research reveals that, for geometrically similar specimens of various sizes, the direct tensile strength with different aggregate volume fractions exhibits differing degrees of improvement with increasing strain rates. The tensile strength gradually decreases as volume fraction increases. The established coupling function incorporating strain rate, specimen size, and aggregate volume fraction accurately characterizes the dynamic tensile strength variation. In addition, a theoretical framework is proposed to provide a microscopic understanding of the static-dynamic size effect. This framework facilitates the estimation of the dynamic tensile strength under specific volume fraction, specimen size and strain rate conditions.

查看原文本刊更多论文

在中观层面研究使用莱卡骨料的轻质混凝土动态抗拉强度的尺寸效应

为了研究轻骨料混凝土体积分数对动态抗拉强度的影响和尺寸效应，本研究将理论推导和微观数值模拟相结合，建立了轻骨料混凝土动态混合断裂内聚区构成模型，以表征微观尺度下考虑应变速率的抗拉行为。研究发现，对于几何形状相似的各种尺寸的试件，不同骨料体积分数的直接抗拉强度随着应变速率的增加而呈现不同程度的改善。拉伸强度随着体积分数的增加而逐渐降低。结合应变率、试样尺寸和骨料体积分数建立的耦合函数准确地描述了动态抗拉强度变化的特征。此外，还提出了一个理论框架，以提供对静态-动态尺寸效应的微观理解。该框架有助于估算特定体积分数、试样尺寸和应变速率条件下的动态抗拉强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.