{"title":"Prestress loss in unbonded prestressed concrete beams based on the strain reduction coefficient","authors":"Pablo M. Páez, Berardi Sensale-Cozzano","doi":"10.1617/s11527-024-02440-9","DOIUrl":null,"url":null,"abstract":"<div><p>Based on the strain reduction coefficient methodology, which enables an analysis of a beam with external or internal unbonded tendons as a beam with bonded tendons, and using the age-adjusted effective modulus method for time analyses of prestressed concrete members under long-term loads, this paper proposes an equation for the calculation of prestress loss in simply supported beams with internal unbonded tendons. The proposed equation takes into account the effects of concrete creep, concrete shrinkage, relaxation of the prestressing steel, and the presence of a bonded, non-prestressed reinforcement. The main goal of this study is to reduce a relatively complex problem, in which it is necessary to analyse the member as a whole, to one of sectional analysis. As our main conclusion, we find that the loss of prestress obtained by applying the proposed equation has an accuracy that is comparable with the results of previous studies and with the application of existing formulations.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":"57 7","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials and Structures","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1617/s11527-024-02440-9","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Based on the strain reduction coefficient methodology, which enables an analysis of a beam with external or internal unbonded tendons as a beam with bonded tendons, and using the age-adjusted effective modulus method for time analyses of prestressed concrete members under long-term loads, this paper proposes an equation for the calculation of prestress loss in simply supported beams with internal unbonded tendons. The proposed equation takes into account the effects of concrete creep, concrete shrinkage, relaxation of the prestressing steel, and the presence of a bonded, non-prestressed reinforcement. The main goal of this study is to reduce a relatively complex problem, in which it is necessary to analyse the member as a whole, to one of sectional analysis. As our main conclusion, we find that the loss of prestress obtained by applying the proposed equation has an accuracy that is comparable with the results of previous studies and with the application of existing formulations.
期刊介绍：
Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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