Ductility and cracking behavior of UHPC-RC composite beam under bending test based on acoustic emission parameters

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-25 DOI:10.1016/j.istruc.2024.107624

Shengli Li , Wei Gou , Zikang Tan , Milad Hedayat , Wencong Sun , Pan Guo

{"title":"Ductility and cracking behavior of UHPC-RC composite beam under bending test based on acoustic emission parameters","authors":"Shengli Li , Wei Gou , Zikang Tan , Milad Hedayat , Wencong Sun , Pan Guo","doi":"10.1016/j.istruc.2024.107624","DOIUrl":null,"url":null,"abstract":"<div><div>Ultrahigh-performance concrete (UHPC) possesses improved mechanical properties due to its high strength, durability, and toughness. Currently, there is a single method for detecting the cracking behavior and evaluating the ductility of the UHPC-reinforced concrete (RC) composite beam. As an important part of structural non-destructive monitoring techniques, the acoustic emission (AE) technique can be used to analyze the damage pattern of the structure by the variation characteristics of its individual parameters. On this basis, four-point bending tests were carried out on the RC beam and UHPC-RC composite beam, and the AE technique was used for ductility analysis and cracking behavior monitoring. The results showed that the UHPC material enhanced the flexural capacity of the UHPC-RC composite beam. The AE ring counts and energy parameters could be used to analyze the cracking process of the UHPC-RC composite beam during flexural damage. The proposed new ductility indices, AE ring counts ductility index (ARD) and AE energy ductility index (AED), differed from the displacement ductility indices within the range of 2 %, providing a new method for calculating ductility indices of concrete structures. During the failure stage, the UHPC-RC composite beam produced more tensile cracks at the early stage of cracking and the stage of damage compared to the RC beam. In addition, the b value of the RC beam had a large range of fluctuations during the failure stage, indicating that the RC beam produced more micro-cracks and macro-cracks and more damage compared to the UHPC-RC composite beam.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"70 ","pages":"Article 107624"},"PeriodicalIF":3.9000,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352012424017776","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

Ultrahigh-performance concrete (UHPC) possesses improved mechanical properties due to its high strength, durability, and toughness. Currently, there is a single method for detecting the cracking behavior and evaluating the ductility of the UHPC-reinforced concrete (RC) composite beam. As an important part of structural non-destructive monitoring techniques, the acoustic emission (AE) technique can be used to analyze the damage pattern of the structure by the variation characteristics of its individual parameters. On this basis, four-point bending tests were carried out on the RC beam and UHPC-RC composite beam, and the AE technique was used for ductility analysis and cracking behavior monitoring. The results showed that the UHPC material enhanced the flexural capacity of the UHPC-RC composite beam. The AE ring counts and energy parameters could be used to analyze the cracking process of the UHPC-RC composite beam during flexural damage. The proposed new ductility indices, AE ring counts ductility index (ARD) and AE energy ductility index (AED), differed from the displacement ductility indices within the range of 2 %, providing a new method for calculating ductility indices of concrete structures. During the failure stage, the UHPC-RC composite beam produced more tensile cracks at the early stage of cracking and the stage of damage compared to the RC beam. In addition, the b value of the RC beam had a large range of fluctuations during the failure stage, indicating that the RC beam produced more micro-cracks and macro-cracks and more damage compared to the UHPC-RC composite beam.

查看原文本刊更多论文

基于声发射参数的 UHPC-RC 复合梁弯曲试验下的延展性和开裂行为

超高性能混凝土（UHPC）因其高强度、耐久性和韧性而具有更好的机械性能。目前，检测超高性能混凝土（UHPC）-钢筋混凝土（RC）复合梁的开裂行为和评估其延展性的方法比较单一。作为结构无损监测技术的重要组成部分，声发射（AE）技术可用于通过单个参数的变化特征来分析结构的损伤模式。在此基础上，对 RC 梁和 UHPC-RC 复合梁进行了四点弯曲试验，并使用声发射技术进行延性分析和开裂行为监测。结果表明，UHPC 材料增强了 UHPC-RC 复合梁的抗弯能力。AE 环数和能量参数可用于分析 UHPC-RC 复合梁在抗弯破坏过程中的开裂过程。提出的新延性指数--AE环数延性指数（ARD）和AE能量延性指数（AED）与位移延性指数的差异在2%以内，为计算混凝土结构的延性指数提供了一种新方法。在破坏阶段，与 RC 梁相比，UHPC-RC 复合梁在开裂早期和破坏阶段产生了更多的拉伸裂缝。此外，在破坏阶段，RC 梁的 b 值波动范围较大，表明与 UHPC-RC 复合梁相比，RC 梁产生了更多的微裂缝和大裂缝，破坏程度也更严重。

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

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.