纤维网格增强砂浆加固RC双向板试验及承载力计算模型研究

doi:10.19936/j.cnki.2096-8000.20230228.003

复合材料科学与工程 ›› 2023, Vol. 0 ›› Issue (2): 24-33.DOI: 10.19936/j.cnki.2096-8000.20230228.003

纤维网格增强砂浆加固RC双向板试验及承载力计算模型研究

李泳璋, 吴迪^*

西安科技大学建筑与土木工程学院,西安 710054

收稿日期:2022-01-17 出版日期:2023-02-28 发布日期:2023-04-28
通讯作者: 吴迪(1980—),男,讲师,工学博士,主要从事岩土体稳定性及结构抗震加固方面的研究,ywzq106107@163.com。
作者简介:李泳璋(1990—),男,主要从事结构构件加固后性能方面的研究。
基金资助:
中国博士后基金(2016M592816)

Research on test and bearing capacity calculation model of two-way RC slabs strengthened with textile reinforced mortar

LI Yongzhang, WU Di^*

School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Received:2022-01-17 Online:2023-02-28 Published:2023-04-28

摘要/Abstract

摘要： 为进一步研究纤维网格增强砂浆(Textile Reinforced Mortar,TRM)加固对钢筋混凝土(Reinforced Concrete,RC)双向板抗弯承载力的影响,通过四点抗弯加载方法对三块RC双向板进行试验,研究不同加固方式对TRM加固RC双向板抗弯承载力及弯曲变形能力等的影响。结果表明:采用TRM对RC双向板进行加固可有效提升其承载能力及弯曲变形能力,与未加固试验板相比,两块加固板的抗弯承载力分别提高了54.2%和43.8%,能量吸收值分别提高了75.5%和49.1%;与未加固试验板相比,采用界面剂与未采用界面剂对试验板进行界面处理,其裂后刚度分别增加了145.2%和83.4%,说明采用界面剂的加固方式能够有效提升加固层与旧结构之间的黏结力,阻止新旧界面裂缝的萌生与发展。同时本文基于塑性铰线理论,提出了TRM加固RC双向板的承载力简易计算公式,同试验值相比吻合度较好,为工程应用提供了较为实用的设计方法。

关键词: 纤维网格增强砂浆, 双向板, 碳纤维网格, 塑性绞线理论, 纤维强度利用率

Abstract: To study the effect of textile reinforced mortar (TRM) on the flexural capacity of two-way reinforced concrete (RC) slab, three two-way RC slabs under monotonic loading distributed at four points were tested. And the influence of different strengthening techniques on the flexural capacity and bending deformation capacity of the two-way RC slab was studied. It was concluded that the application of TRM to strengthen the two-way RC slab can effectively improve its flexural capacity and bending deformation capacity. Compared with the unreinforced test plates, the flexural capacity and energy absorption of the two strengthened plates are increased by 54.2% and 43.8%, 75.5% and 49.1% respectively. Compared with the unreinforced test plates, the post-cracking stiffness of the test plates are increased by 145.2% and 83.4% with and without interfacial agent, which shows that the application of interface agent for interface treatment can improve the adhesion between the strengthening layer and the old structure, thus preventing the initiation and development of cracks between the new and old interfaces. Based on the theory of plastic hinge lines, a simple calculation formula for the flexural capacity of the two-way RC slab strengthened with TRM was proposed, which provided the reference for the application of TRM for strengthening projects.

Key words: textile reinforced mortar, two-way slab, carbon fiber net, the theory of plastic hinges, fiber strength utilization rate

中图分类号:

TB332

李泳璋, 吴迪. 纤维网格增强砂浆加固RC双向板试验及承载力计算模型研究[J]. 复合材料科学与工程, 2023, 0(2): 24-33.

LI Yongzhang, WU Di. Research on test and bearing capacity calculation model of two-way RC slabs strengthened with textile reinforced mortar[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(2): 24-33.

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纤维网格增强砂浆加固RC双向板试验及承载力计算模型研究

Research on test and bearing capacity calculation model of two-way RC slabs strengthened with textile reinforced mortar

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