体外预应力CFRP筋自密实混凝土梁的预应力损失

doi:10.19936/j.cnki.2096-8000.20210628.004

复合材料科学与工程 ›› 2021, Vol. 0 ›› Issue (6): 26-33.DOI: 10.19936/j.cnki.2096-8000.20210628.004

体外预应力CFRP筋自密实混凝土梁的预应力损失

吴丽丽, 耿大林, 岳岩松, 杨家琦

中国矿业大学(北京) 力学与建筑工程学院,北京 100083

收稿日期:2020-10-16 出版日期:2021-06-28 发布日期:2021-08-03
作者简介:吴丽丽(1977-),女,博士,教授,研究方向为钢结构、组合结构,jennywll@163.com。
基金资助:
国家自然科学基金项目(51678564)

PRESTRESS LOSS OF SELF-COMPACTING CONCRETE BEAMSREINFORCED WITH EXTERNAL CFRP TENDONS

WU Li-li, GENG Da-lin, YUE Yan-song, YANG Jia-qi

School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China

Received:2020-10-16 Online:2021-06-28 Published:2021-08-03

摘要/Abstract

摘要： 通过体外预应力筋的预应力损失理论计算、试验监测和有限元数值模拟等方法,对体外预应力CFRP筋自密实混凝土(SCC)梁的预应力损失展开研究。共设计6根自密实混凝土试验梁和2根普通混凝土试验梁,研究在不同预应力水平、不同混凝土强度等级下体外CFRP筋预应力损失的规律以及与普通混凝土预应力损失的差别,并将试验值与理论值、有限元值(包括锚固损失、温差损失、松弛损失、收缩及徐变损失)进行对比。结果表明:锚固损失的理论值偏大,理论公式同样适用于CFRP筋,但参数取值应通过实测确定。温差损失公式计算出的CFRP筋与SCC线膨胀系数差值为实际值的500%左右,理论公式不再适用于FRP-SCC梁。CFRP筋松弛损失和SCC收缩徐变损失之和的理论值与试验值相差20%左右,但该理论公式对于强度等级为C65的SCC试件误差较大。CFRP筋预应力损失随预应力水平的减小而减小,减幅最大为15.2%;预应力损失随着混凝土强度等级的提高而增大,其增幅最大为10.4%;普通混凝土试件的预应力损失大于SCC试件,差值最大为11%。

关键词: CFRP筋, 体外预应力, 预应力损失, 锚固损失, 温差损失

Abstract: This study aimed to provide a comprehensive experimental, analytical and numerical investigation of prestress loss of self-compacting concrete (SCC) beams with external CFRP tendons. A total of 6 specimens of SCC beams and 2 specimens of controlling beams were designed and tested to get the laws of prestress loss, including anchorage loss, temperature difference loss, relaxation loss, shrinkage loss and creep loss of CFRP bars, at different prestressing and concrete strength levels. The comparison of prestress loss between self-compacting concrete and controlling beams were also made. The results show that the theoretical value of anchorage loss is larger than actual value. The formulas for controlling beams are also suitable for CFRP tendons, while some parameters in the formulas should be determined by tests. Linear expansion coefficient of CFRP bars and SCC calculated by the temperature difference loss formula was about 500% bigger than the actual value. So the formulas for controlling beams are no longer suitable for FRP-SCC components. The total theoretical loss of relaxation of CFRP bars, shrinkage and creep of concrete were about 20% different from the test results, while the theoretical formula exhibited the larger error for the SCC specimens of concrete with the strength level of C65. The loss of external prestress of CFRP bars decreased with the decrease of prestress level, and the maximum reduction of prestress loss is 15.2%. The prestress loss increased with the increase of concrete strength, with the maximum increase of 10.4%. The prestress loss of controlling concrete specimens is greater than that of SCC specimens, and the maximum difference is 11%.

Key words: CFRP tendons; external prestress; prestress loss; anchorage loss; temperature difference loss

中图分类号:

TB332

吴丽丽, 耿大林, 岳岩松, 杨家琦. 体外预应力CFRP筋自密实混凝土梁的预应力损失[J]. 复合材料科学与工程, 2021, 0(6): 26-33.

WU Li-li, GENG Da-lin, YUE Yan-song, YANG Jia-qi. PRESTRESS LOSS OF SELF-COMPACTING CONCRETE BEAMSREINFORCED WITH EXTERNAL CFRP TENDONS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(6): 26-33.

参考文献

[1] KARBHARI V M. Use of composite materials in civil infrastructure in Japan[R]. University of California, 1998.
[2] 陈肇元. 高强与高性能混凝土的发展及应用[J]. 土木工程学报, 1997(5): 3-11.
[3] 王成启, 张悦然. 粉煤灰海工自密实高性能混凝土的试验研究[J]. 新型建筑材料, 2011, 38(9): 63-66.
[4] SHI C, HE T S, ZHANG G, et al. Effects of superplasticizers on carbonation resistance of concrete[J]. Construction and Building Materials, 2016, 108: 48-55.
[5] JSCE. Recommendation for design and construction of concrete structures using continuous fiber reinforcing materials[C]//Research committee on continuous fiber reinforcing materials. Tokyo, Japan: 1997.
[6] NABIL F G, GEORGE A S. Behavior of externally draped CFRP tendons in prestressed concrete bridges[J]. PCI Journal, 1998, 43(5): 88-101.
[7] NABIL F G, TSUYOSHI E, GEORGE A S, et al. Experimental study and analysis of a full-scale CFRP/CFCC double-tee bridge beam[J]. PCI Journal, 2003, 48(4): 120-139.
[8] NABIL F G, FREDERICK C N, RECHARD B N, et al. Design-construction of bridge street bridge-first CFRP bridge in the United States[J]. PCI Journal, 2002, 47(5): 20-35.
[9] 胡志坚, 胡钊芳. 实用体外预应力结构预应力损失估算方法[J]. 桥梁建设, 2006(1): 73-75, 82.
[10] 王鹏, 丁汉山, 吕志涛, 等. 碳绞线体外预应力在桥梁中的应用[J]. 东南大学学报(自然科学版), 2007(6): 1061-1065.
[11] 郭风琪, 袁石沣, 单智. 新型体外预应力体系预应力瞬时损失试验研究[J]. 铁道科学与工程学报, 2014, 11(6): 1-5.
[12] 王作虎, 杜修力, 刘晶波. 预应力碳纤维增强材料筋混凝土梁的应力损失研究[J]. 工业建筑, 2011, 41(10): 29-32.
[13] 拉挤玻璃纤维增强塑料杆力学性能试验方法: GB/T 13096—2008[S]. 北京: 中国标准出版社, 2008.
[14] 张雅琴. 碳纤维筋体外加固预应力损失分析[D]. 天津: 天津大学, 2016.
[15] 熊学玉. 体外预应力结构设计[M]. 北京: 中国建筑工业出版社, 2005.
[16] 孟履祥, 徐福泉, 关建光, 等. 碳纤维筋(CFRP筋)松弛损失试验研究[J]. 施工技术, 2005(7): 40-41, 53.
[17] 王鹏, 吕志涛, 丁汉山, 等. 采用CFRP筋施加体外预应力的分析[J]. 特种结构, 2007(3): 80-84.
[18] 公路钢筋混凝土及预应力混凝土桥涵设计规范: JTG 3362—2018[S]. 北京: 人民交通出版社, 2018.
[19] 袁明, 颜东煌. PC箱梁竖向预应力张拉锚固阶段应力损失研究[J]. 公路交通科技, 2010, 27(10): 53-57.
[20] 宁俊超. 基于ansys大跨度张弦梁结构预应力模拟研究[D]. 成都: 西南交通大学, 2013.
[21] 王新敏. ANSYS 工程结构数值分析[M]. 北京: 人民交通出版社, 2007.
[22] 混凝土结构设计规范: GB 50010—2010[S]. 北京: 中国建筑工业出版社, 2010.

体外预应力CFRP筋自密实混凝土梁的预应力损失

PRESTRESS LOSS OF SELF-COMPACTING CONCRETE BEAMSREINFORCED WITH EXTERNAL CFRP TENDONS

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 7

编辑推荐

Metrics

本文评价

[1]	王作虎, 邵明哲, 刘杜, 杨菊. CFRP筋-高强钢筋增强高强混凝土梁抗弯性能研究[J]. 复合材料科学与工程, 2021, 0(4): 12-17.
[2]	张军, 蔡文华, 荀勇, 胡夏闽. 预应力CFRP筋夹片式锚具改进设计及试验研究[J]. 玻璃钢/复合材料, 2018, 0(9): 63-69.
[3]	付成龙,陈利,张雅璐. 几何尺寸与温度对CFRP筋材力学性能的影响[J]. 玻璃钢/复合材料, 2016, 0(5): 74-79.
[4]	陈蓓, 李十泉, 刘荣桂, 谢桂华. CFRP筋复合型锚具静载测试及黏结应力分布[J]. 复合材料科学与工程, 2015, 0(11): 5-8.
[5]	李彪, 杨勇新, 岳清瑞. 碳纤维筋锚固性能试验研究[J]. 复合材料科学与工程, 2014, 0(12): 79-83.
[6]	张鹏, 邓朗妮, 邓宇. 预应力部分粘结CFRP筋预应力混凝土梁受弯性能的试验研究[J]. 玻璃钢/复合材料, 2009, 209(5): 27-30.
[7]	王兴国, 张春生, 王文华, 周朝阳. 预应力CFRP板加固混凝土桥梁研究与应用[J]. 玻璃钢/复合材料, 2009, 209(4): 83-85.