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【论文分享】FRP-UHPC永久模板对钢筋混凝土梁抗剪承载力与延性的协同增强效应

【论文分享】FRP-UHPC永久模板对钢筋混凝土梁抗剪承载力与延性的协同增强效应
论文链接:https://doi.org/10.1016/j.engstruct.2025.121453

1

题目

Synergetic enhancement of shear strength and ductility in reinforced concrete beams using FRP-UHPC stay-in-place formwork (FRP-UHPC永久模板对钢筋混凝土梁抗剪承载力与延性的协同增强效应)

2

来源

出版年份:2025

来源:Engineering Structures

作者:Ke-Fan Weng, Ji-Xiang Zhu, Bo-Tao Huang, Jian-Guo Dai, Jian-Fei Chen

作者单位:南方科技大学、香港大学、香港理工大学、浙江大学、香港城市大学

3

摘要

本文研究了一种由FRP筋增强UHPC永久模板与内部钢筋混凝土梁组成的组合梁体系,重点分析该体系对RC梁抗剪性能、裂缝发展和破坏模式的影响。研究共制作了12根组合梁,主要考虑三个变量:剪跨比1.57与2.52、UHPC中纤维类型即钢纤维与聚乙烯PE纤维,以及UHPC模板中是否配置CFRP筋。试验过程中采用DIC技术对裂缝发展和试件应变进行观测。结果表明,FRP-UHPC永久模板与现浇混凝土之间具有较好的界面性能,相比普通RC梁,该体系可使抗剪承载力提高约40%~65%,同时提高初始刚度和开裂后刚度。UHPC模板中配置 CFRP筋后,可有效抑制斜裂缝扩展,减小裂缝宽度,并进一步提高抗剪承载力。值得注意的是,部分组合梁出现了区别于传统脆性剪切破坏的延性剪切破坏模式。最后,本文提出了一种理论分析方法,用于预测 FRP-UHPC 永久模板增强RC梁的抗剪承载力,并与试验结果吻合较好。

4

研究背景

永久模板是指在混凝土浇筑完成后不拆除、继续作为结构一部分参与受力的模板体系。相比传统木模板或钢模板,永久模板具有施工简化、减少人工、缩短工期和降低综合成本等优势,在桥梁、楼板、梁柱以及海洋工程结构中具有较好的应用前景。FRP材料具有轻质、高强和耐腐蚀等优点,适合用于海洋环境和耐久性要求较高的混凝土结构中,但FRP本身也存在弹性模量相对较低、服役阶段挠度和裂缝宽度较大、极限状态下破坏偏脆以及高温下树脂基体性能退化等问题。UHPC具有高抗压强度、高抗拉性能和优良耐久性,可作为外部保护层或永久模板使用,改善FRP材料耐火性和耐久性不足的问题。已有研究表明,UHPC永久模板能够提高组合构件的抗弯和抗剪承载力,并改善开裂性能。但对于 FRP-UHPC-RC多材料组合梁,现有规范公式难以直接适用,抗剪机理和承载力预测仍需进一步研究。

5

研究内容

本文设计并开展了FRP-UHPC永久模板增强钢筋混凝土梁的抗剪试验。该体系在普通RC梁两侧设置厚度为20mm的UHPC预制模板,并在部分模板中嵌入直径3mm的CFRP筋作为抗剪增强材料;同时,为提高UHPC模板与现浇混凝土之间的界面粘结性能,在UHPC模板表面预制矩形槽。试验共设置12根梁,主要变量包括是否设置UHPC永久模板、UHPC中纤维类型、是否配置 CFRP 筋以及剪跨比大小。试验采用四点弯曲加载方式,两个加载点之间的纯弯段长度为300mm,剪跨分别为480mm和300mm;试验过程中通过LVDT测量跨中挠度、支座位移及UHPC模板与现浇混凝土之间的相对位移,并结合DIC技术记录梁侧应变场和裂缝发展过程。基于试验结果,本文进一步提出了FRP-UHPC永久模板增强RC梁的抗剪承载力理论模型,该模型基于桁架-拱受力机制,将内部RC 梁、UHPC模板和CFRP筋共同纳入抗剪受力体系,以反映多材料组合梁中普通混凝土、UHPC与FRP筋之间的协同作用。

图1 (a)试件尺寸;(b)表面处理方式及沟槽尺寸

图2 试验梁的荷载–挠度(P-δ)曲线

图3 组合梁裂缝形态

图4 UHPC模板与混凝土之间的脱粘

图5 试验结果与计算结果的对比

6

主要结论

1. 本文提出了一种FRP-UHPC永久模板增强RC梁的组合体系,该体系能够显著提高梁的开裂荷载、峰值承载力、初始刚度和开裂后刚度。

2. UHPC永久模板与现浇混凝土之间具有良好的界面性能,表面开槽能够增强机械咬合作用,使两者协同参与受力。

3. 在UHPC模板中配置CFRP筋可以有效限制斜裂缝扩展,减小裂缝宽度,并进一步提高组合梁的抗剪承载力。

4. 钢纤维UHPC具有较好的裂缝抑制能力和抗剪增强效果,而PE纤维 UHPC具有较大的变形能力和较好的整体完整性,二者适用于不同工程需求。

5. 本文提出的桁架-拱理论模型能够较好预测FRP-UHPC永久模板增强RC 梁的抗剪承载力,可为该类组合结构的设计计算提供参考。

7

文章亮点

文章结合DIC技术揭示了组合梁裂缝发展和破坏过程,并提出桁架-拱理论模型用于预测抗剪承载力,为FRP-UHPC永久模板在混凝土梁抗剪增强中的应用提供了试验依据和设计参考。

本期编者简介:

翻译 | 王缘龙(硕士生)

硕士研究生,研究方向为FRP-混凝土组合结构。

编辑 | 王浩迪(硕士生)

校核 | 林红威(副教授)

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  1. CONNECT:[ UseTime:0.000669s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000879s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000337s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000402s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000481s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000626s ]
  8. SELECT * FROM `article` WHERE `id` = 855360 LIMIT 1 [ RunTime:0.000465s ]
  9. UPDATE `article` SET `lasttime` = 1784016621 WHERE `id` = 855360 [ RunTime:0.010470s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000283s ]
  11. SELECT * FROM `article` WHERE `id` < 855360 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000571s ]
  12. SELECT * FROM `article` WHERE `id` > 855360 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000369s ]
  13. SELECT * FROM `article` WHERE `id` < 855360 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000621s ]
  14. SELECT * FROM `article` WHERE `id` < 855360 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000576s ]
  15. SELECT * FROM `article` WHERE `id` < 855360 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000622s ]
0.099658s