纤维增强复合材料网格-环氧砂浆加固混凝土梁的抗剪性能试验

杜敏; 陈思远; 郭兢业; 郝汉; 郭瑞

doi:10.13204/j.gyjzG20110320

纤维增强复合材料网格-环氧砂浆加固混凝土梁的抗剪性能试验

doi: 10.13204/j.gyjzG20110320

杜敏¹,
陈思远²,
郭兢业³,
郝汉⁴,
郭瑞^5, ,

1. 四川建筑职业技术学院交通与市政工程系, 成都 610399;
2. 福建省建筑科学研究院有限责任公司, 福州 350001;
3. 中铁上海设计院集团有限公司, 上海 200070;
4. 中国铁路郑州局集团有限公司, 郑州 450000;
5. 西南交通大学土木工程学院, 成都 610031

基金项目:

国家自然科学基金项目（52008350）；四川建筑职业技术学院科研项目（2020KJ06）。

详细信息

作者简介:
杜敏,女,1986年出生,硕士,讲师。

通讯作者:
郭瑞,博士,讲师,guor4867@swjtu.edu.cn。

计量
- 文章访问数: 83
- HTML全文浏览量: 6
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2020-11-03
- 网络出版日期: 2021-11-10
- 刊出日期: 2021-11-10

EXPERIMENTAL RESERCH ON SHEAR PROPERTIES OF RC BEAMS REINFORCED WITH FRP GRIDS AND EPOXY MORTAR

DU Min¹,
CHEN Siyuan²,
GUO Jingye³,
HAO Han⁴,
GUO Rui^{5
, ,}

1. Department of Transportation and Municipal Engineering, Sichuan College of Architectural Technology, Chengdu 610399, China;
2. Fujian Academy of Building Research Co., Ltd., Fuzhou 350001, China;
3. China Railway Shanghai Design Institute Group Co., Ltd., Shanghai 200070, China;
4. China Railway Zhengzhou Group Co., Ltd., Zhengzhou 450000, China;
5. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 通过对7根试验梁进行了四点弯曲静力加载试验，研究纤维增强复合材料（FRP）网格-砂浆加固钢筋混凝土梁在其受剪过程中的界面机理和破坏模式，深入分析不同加固参数下此种加固方法的抗剪加固效果以及FRP网格的实际受力行为；并通过收集到的试验数据对五种现有计算模型进行分析对比。研究结果表明：FRP网格加固试件可抑制斜裂缝的发展，大大提高试件的极限承载力和变形能力，加固效果显著；当原混凝土梁的剪切斜裂缝宽度过大或出现剪压破坏时，FRP网格-砂浆与原混凝土梁间易产生不同程度的界面剥离破坏；在一定范围内，FRP网格的抗剪贡献与混凝土强度、剪跨比呈负相关，与FRP网格加固量呈正相关；并且混凝土强度或剪跨比越大，加固层出现界面提前剥离的可能性越高。
- FRP网格 /
- 水泥基材 /
- 钢筋混凝土梁 /
- 抗剪性能试验
Abstract: The four-point bending static loading tests of seven test beams were carried out to study the interface mechanism and failure mode of reinforced concrete beams strengthened with FRP grids and epoxy mortar in the shear process. The shear reinforcement effect of this method with different reinforcement parameters and the actual stress behaviors of FRP grids were analyzed. The five calculation models were analyzed and compared based on the collected test data. The results showed that the specimens strengthened with FRP grid could constrain the development of diagonal cracks, delay the formation of main oblique cracks, greatly improve the ultimate bearing capacity and deformation capacity of specimens, and the reinforcement effect was remarkable. When the width of the shear diagonal crack of the original concrete beam was too large or the shear compression failure occured, the interface between the reinforcement layer and the original concrete beam was easy to produce different degrees of peeling failure. In a certain range, the shear contribution of FRP grids was negatively correlated with the concrete strength or shear-span ratio, and positively correlated with the reinforcement amount of FRP grids, and the greater the concrete strength or shear-span ratio, the higher the possibility of interface peeling off in advance.
- FRP grid /
- epoxy mortar /
- reinforced concrete beam /
- shear porperty test

HTML全文

参考文献(19)

[1]	吴刚. FRP加固钢筋混凝土结构的试验研究与理论分析[D]. 南京:东南大学,2002.
[2]	郑宇宙,王文炜. 复材网格-UHTCC复合增强钢筋混凝土梁抗弯性能试验研究[J]. 土木工程学报,2017,50(6):23-32.
[3]	刘延年. CFRP加固混凝土构件的耐久性评定方法研究[D]. 成都:西南交通大学,2016.
[4]	GUO R, PAN Y, CAI L H, et al. Study on Design Formula of Shear Capacity of RC Beams Reinforced by CFRP Grid with PCM Shotcrete Method[J]. Engineering Structures, 2018, 166(5):427-440.
[5]	YAMAGUCHI K, HINO S, NAKAMURA S. Experimental Study on Shear Strengthening Effect and the Adhesive Characteristic of Reinforced Interface for RC Beams with PCM Shotcrete Method[J]. Proceedings of the Japan Concrete Institute, 2008, 30(3):1285-1290.
[6]	GUO R, PAN Y, CAI L H, et al. Bonding Behavior of CFRP Grid-Concrete with PCM Shotcrete[J]. Engineering Structures, 2018, 168:333-345.
[7]	陈文永,陈小兵,丁一,等. 纤维网格及ECC材料抗剪加固性能研究[J]. 工业建筑,2009,39(12):118-122.
[8]	王文炜,郑宇宙. BFRP格栅增强ECC加固钢筋混凝土梁抗剪承载力试验研究[C]//第九届全国建设工程FRP应用学术交流会论文集. 重庆:2015:317-322.
[9]	ESCRIG C, GIL L, BERNAT-MASO E, et al. Experimental and Analytical Study of Reinforced Concrete Beams Shear Strengthened with Different Types of Textile-Reinforced Mortar[J]. Construction and Building Materials, 2015, 83:248-260.
[10]	ZHENG Y Z, WANG W W, BRIGHAM J C. Flexural Behaviour of Reinforced Concrete Beams Strengthened with a Composite Reinforcement Layer:BFRP Grid and ECC[J]. Construction and Building Materials, 2016, 115:424-437.
[11]	周英武. FRP-高强混凝土梁强度与延性的理论与试验研究[D]. 大连:大连理工大学,2009.
[12]	袁健. 钢筋混凝土梁受剪承载力及其可靠度研究[D]. 长沙:湖南大学,2017.
[13]	Japan Society of Civil Engineers. Concrete Library 88:Design and Construction Guidelines for Concrete Structures Using Continuous Fiber Reinforcement[S]. Tokyo:JSCE, 1996.
[14]	Japan Society of Civil Engineers. Concrete Library 101:Repair Reinforcement Guidelines for Concrete Structures Using Continuous Fiber Sheet[S]. Tokyo:JSCE, 2000.
[15]	THOMAS B, BJORN T, ANDERS C. Shear Strengthening of Concrete Structures with the Use of Mineral-Based Composites[J]. Journal of Composites for Construction, 2009, 13(1):25-34.
[16]	郭瑞,任宇,顾天宇. 纤维增强复材网格-工程水泥基复合材料加固钢筋混凝土梁的抗剪性能试验研究[J]. 工业建筑,2019,49(9):145-151.
[17]	郑宇宙. FRP格栅增强ECC复合加固混凝土梁试验与计算方法研究[D]. 南京:东南大学,2018.
[18]	THOMAS B. Strengthening of Concrete Structures by the Use of Mineral Based Composites:System and Design Models for Flexure and Shear[D]. Luleå:Luleå University of Technology, 2009.
[19]	RIZWAN A, KHALED S, WEST J S, et al. CFRP Grid Embedded in Mortar for Strengthening of Shear-Critical RC Beams[J]. Magazine of Concrete Research, 2018, 76(14):761-772.