{"title":"Experimental study on T-shaped reinforced concrete beams with locally reduced cross-sections","authors":"S.S. Zhang, D.D. Zhang, X.F. Nie, J.P. Ye","doi":"10.1016/j.istruc.2024.107180","DOIUrl":null,"url":null,"abstract":"The principle of strong column and weak beam (SCWB) is often adopted in the design of reinforced concrete (RC) frames to ensure their optimum seismic performance. However, insufficient consideration of the SCWB hierarchy has resulted in numerous existing RC frames violating such a hierarchy. Consequently, a novel seismic retrofitting technique (section reduction technique) was proposed for RC frames that violate the SCWB hierarchy. The section reduction (SR) technique involves creating a locally reduced cross-sections (i.e., a gap) in the bottom region of the beam (i.e., the compression region of the beam under negative bending) adjacent to the beam-to-column joint and applying a fiber-reinforced polymer (FRP) strengthening system, which reduces the negative bending capacity of the beam while improving the shear capacity of the gap region. Nine full-size RC beams were fabricated and three-point negative bending experiments were conducted to demonstrate the validity of the SR technique. Based on the test results, it was found that a gap of appropriate size can effectively reduce the negative bending capacity of a T-shaped RC beam. In addition, the ductility of the beams can be ensured if the occurrence of FRP U-jacket debonding can be effectively prevented when applying the FRP strengthening system.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Structures","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.istruc.2024.107180","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
The principle of strong column and weak beam (SCWB) is often adopted in the design of reinforced concrete (RC) frames to ensure their optimum seismic performance. However, insufficient consideration of the SCWB hierarchy has resulted in numerous existing RC frames violating such a hierarchy. Consequently, a novel seismic retrofitting technique (section reduction technique) was proposed for RC frames that violate the SCWB hierarchy. The section reduction (SR) technique involves creating a locally reduced cross-sections (i.e., a gap) in the bottom region of the beam (i.e., the compression region of the beam under negative bending) adjacent to the beam-to-column joint and applying a fiber-reinforced polymer (FRP) strengthening system, which reduces the negative bending capacity of the beam while improving the shear capacity of the gap region. Nine full-size RC beams were fabricated and three-point negative bending experiments were conducted to demonstrate the validity of the SR technique. Based on the test results, it was found that a gap of appropriate size can effectively reduce the negative bending capacity of a T-shaped RC beam. In addition, the ductility of the beams can be ensured if the occurrence of FRP U-jacket debonding can be effectively prevented when applying the FRP strengthening system.
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.