基于应变协调模型的CFRP复合材料混凝土梁抗剪加固优化设计

IF 0.9 Q4 ENGINEERING, CIVIL

Australian Journal of Structural Engineering Pub Date : 2021-01-02 DOI:10.1080/13287982.2021.1876439

M. A. Alam, A. Sami

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引用次数: 1

摘要

优化CFRP剪切带在连接件/锚的存在是当前的兴趣，以减少结构的改造成本。本研究的主要目的是提出考虑剪切钢筋和外部粘结CFRP层合板之间应变相容性的设计准则，以优化CFRP层合板的尺寸，以便在存在嵌入式连接器的情况下对RC梁进行剪切加固。通过对5根钢筋混凝土梁的结构试验验证了该准则的有效性。结果表明，带接插件的指南能显著减小CFRP层合板的尺寸。优化后的加固梁具有最高的抗弯能力、最大的延性和经济有效的结构性能。剪切加筋与外粘接CFRP层压板在剪切开裂和微剥离前表现出相同的应变性质。优化后的带连接件加固梁在达到梁的理论设计抗剪能力之前，不会因层合板的剪切或脱粘而失效。优化加固梁的设计抗剪承载力(182 kN)与受弯破坏荷载(181 kN和184 kN)的设计抗剪承载力非常接近。总体实验结果满意地验证了所提出的设计准则。

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Strain compatibility model to optimise CFRP laminate for shear strengthening of RC beam

ABSTRACT Optimisation of CFRP shear strip in presence of connectors/anchors is the current interest to reduce retrofitting cost of structures. The main aim of this research was to propose design guideline considering strain compatibility nature between shear reinforcement and externally bonded CFRP laminate to optimise the dimension of CFRP laminate for shear strengthening of RC beam in presence of embedded connectors. The guideline had been experimentally verified through the structural investigations on five reinforced concrete beams. Results showed that the proposed guideline with connectors reduced the dimension of CFRP laminate significantly. The optimal strengthened beams had shown the highest flexural capacities, maximum ductility and cost effective structural performances. Shear reinforcement and externally bonded CFRP laminate had shown identical nature of strains until shear crack and micro debonding of laminate. The optimal strengthened beams with connector did not fail by shear or debonding of laminates prior to theoretical design shear capacities of beams. The design shear capacities of optimal strengthened beams (182 kN) were very close to those of flexural failure loads (181 kN and 184 kN). Overall experimental results satisfactorily verified the proposed design guideline.

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来源期刊

Australian Journal of Structural Engineering ENGINEERING, CIVIL-

CiteScore

2.50

自引率

0.00%

发文量

期刊介绍： The Australian Journal of Structural Engineering (AJSE) is published under the auspices of the Structural College Board of Engineers Australia. It fulfils part of the Board''s mission for Continuing Professional Development. The journal also offers a means for exchange and interaction of scientific and professional issues and technical developments. The journal is open to members and non-members of Engineers Australia. Original papers on research and development (Technical Papers) and professional matters and achievements (Professional Papers) in all areas relevant to the science, art and practice of structural engineering are considered for possible publication. All papers and technical notes are peer-reviewed. The fundamental criterion for acceptance for publication is the intellectual and professional value of the contribution. Occasionally, papers previously published in essentially the same form elsewhere may be considered for publication. In this case acknowledgement to prior publication must be included in a footnote on page one of the manuscript. These papers are peer-reviewed as new submissions. The length of acceptable contributions typically should not exceed 4,000 to 5,000 word equivalents. Longer manuscripts may be considered at the discretion of the Editor. Technical Notes typically should not exceed about 1,000 word equivalents. Discussions on a Paper or Note published in the AJSE are welcomed. Discussions must address significant matters related to the content of a Paper or Technical Note and may include supplementary and critical comments and questions regarding content.