UHPFRC加固RC梁抗剪承载力方程的建立

IF 2.9 4区 工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-05-01 DOI:10.12989/CAC.2021.27.5.473
Walid Mansour, M. Sakr, A. Seleemah, Bassam A. Tayeh, Tarek M. Khalifa
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引用次数: 29

摘要

对文献和设计指南的回顾表明,缺乏控制用超高性能纤维增强混凝土(UHPFRC)加固的钢筋混凝土(RC)梁抗剪强度的设计规范。本研究利用作者之前构建的三维有限元模型的结果,并通过实验程序进行验证,以清楚地了解不同方案下UHPFRC加固RC梁的抗剪强度。本文将文献中的试验结果与常规强度RC和UHPFRC无箍筋梁的抗剪能力的数值结果与现有的规范设计指南和文献中的经验模型进行了比较。结果表明,经验模型与实验结果存在差异。因此,根据文献中发现的经验模型推导出的公式被设置为估计无箍筋的标准强度RC梁的抗剪能力。此外,在关于无箍筋UHPFRC梁的抗剪能力的文献中,设计准则的方程中没有考虑术语“剪切跨深比”。因此,本文提出了UHPFRC和UHPFRC板加固RC梁的抗剪强度计算公式,考虑了抗剪跨深比的影响,并通过作者先前进行的实验程序进行了验证。
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Development of shear capacity equations for RC beams strengthened with UHPFRC
The review of the literature and design guidelines indicates a lack of design codes governing the shear strength of reinforced concrete (RC) beams strengthened with ultrahigh-performance fiber-reinforced concrete (UHPFRC). This study uses the results of a 3D finite element model constructed previously by the authors and verified against an experimental programme to gain a clear understanding of the shear strength of RC beams strengthened with UHPFRC by using different schemes. Experimental results found in the literature along with the numerical results for shear capacities of normal-strength RC and UHPFRC beams without stirrups are compared with available code design guidelines and empirical models found in the literature. The results show variance between the empirical models and the experimental results. Accordingly, proposed equations derived based on empirical models found in the literature were set to estimate the shear capacity of normal-strength RC beams without stirrups. In addition, the term 'shear span-to-depth ratio' is not considered in the equations for design guidelines found in the literature regarding the shear capacity of UHPFRC beams without stirrups. Consequently, a formula estimating the shear strength of UHPFRC and RC beams strengthened with UHPFRC plates and considering the effect of shear span-to-depth ratio is proposed and validated against an experimental programme previously conducted by the authors.
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来源期刊
Computers and Concrete
Computers and Concrete 工程技术-材料科学:表征与测试
CiteScore
8.60
自引率
7.30%
发文量
0
审稿时长
13.5 months
期刊介绍: Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.
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