FRP 筋混凝土梁的抗剪承载力

doi:10.12066/j.issn.1007-2861.2027

摘要/Abstract

摘要：

利用《纤维增强复合材料建设工程应用技术规范》(GB50608—2010)建议的纤维增强复合(fiber-reinforced polymer,FRP)筋混凝土梁受剪承载力计算公式, 分析了收集到的171 根 FRP 筋试验梁(包括无箍筋梁和配 FRP 箍筋梁)的抗剪承载力.对比了各梁抗剪承载力的计算值与试验值发现,《规范》推荐的方法过于保守. 为此,采用灰度关联法分析了影响 FRP 筋试验梁受剪承载力的主要因素. 结果表明,截面有效高度对受剪承载力影响最大,其次分别为纵筋配筋率、混凝土抗压强度和剪跨比.据此分析了《规范》公式存在对截面有效高度估计不足、未考虑剪跨比影响等缺陷,并在此基础上对《规范》公式进行了相应修正.利用上述 171 根梁的试验数据验证了修正后的抗剪承载力计算公式的合理性.结果表明: 对于无箍筋梁,修正前后试验值与理论值之比的均值由 4.78 变为 1.49;而配 FRP 箍筋梁的均值则由 2.18 变为 1.40.

关键词: 纤维增强复合筋, 混凝土梁, 抗剪承载力, 截面有效高度, 剪跨比

Abstract:

171 test beams reinforced with fiber-reinforced polymer (FRP) bars including with and without FRP stirrups were analyzed by using shear bearing capacity's formulas recommended by the Technical Code for Infrastructure Application of FRP Composites (GB 50608—2010). By comparing each beam's predicted shear strength with its corresponding experimental value, the result showed that the method adopted by the Code was highly conservative. Therefore, main factors affecting the shear capacity of FRP reinforced concrete members with shear reinforcement were analyzed by adopting the grey relational analysis. The results showed that the most important factor was effective depth of the cross section, followed by longitudinal reinforcement ratio, concrete compressive strength, the shear span ratio and so on. Accordingly, it was analyzed that the formulas in the Code underestimated the effect of effective depth of the cross section and ignored its impact on shear span ratio and so on. The formulas were revised on the basis of previous analyses and their rationality verified by using aforementioned 171 beams test data. Compared with the unrevised provision, the mean of ratio of the test to the predicted shear strength of the beams without shear reinforcement went from 4.78 down to 1.49, whereas in the case of those beams with stirrups the figure went from 2.18 down to 1.40.

Key words: fiber-reinforced polymer (FRP) bars, concrete beams, shear bearing capacity, effective depth of the cross section, shear span ratio

中图分类号:

TU37

张智梅, 陈刚, 王卓. FRP 筋混凝土梁的抗剪承载力[J]. 上海大学学报(自然科学版), 2020, 26(2): 301-310.

ZHANG Zhimei, CHEN Gang, WANG Zhuo. Shear bearing capacity for concrete beams with FRP reinforcement[J]. Journal of Shanghai University（Natural Science Edition）, 2020, 26(2): 301-310.

图/表 8

表 1

表 2

表 3

表 4

图 1

图 2

图 3

表 5

参考文献 21

[1]	叶列平, 冯鹏 . FRP 在工程结构中的应用与发展[J]. 土木工程学报, 2006,39(3):24-36.
[2]	王作虎, 邓宗才, 杜修力 , 等. 预应力 FRP 筋混凝土梁的研究进展[J]. 工业建筑, 2008(增刊 1):777-782.
[3]	陈达, 江朝华, 张玮 , 等. 玻璃纤维增强塑料(GFRP)筋混凝土梁斜截面受力性能[J]. 河海大学学报(自然科学版), 2007,35(5):534-537.
[4]	师晓权, 张志强, 李志业 , 等. GFRP 筋混凝土梁抗剪承载力影响因素[J]. 西南交通大学学报, 2010,45(6):898-903.
[5]	岳清瑞, 叶列平, 滕锦光 , 等. GB 50608—2010 纤维增强复合材料建设工程应用技术规范 [M]. 北京: 中国计划出版社, 2010: 61-63.
[6]	赵基达, 朱爱萍, 刘立新 , 等. GB 50010—2015 混凝土结构设计规范 [M]. 北京: 中国建筑工业出版社, 2015: 10-13.
[7]	李爱群, 王铁成 . 混凝土结构设计原理 [M]. 北京: 中国建筑工业出版社, 2016: 11-12.
[8]	Guadagnini M, Pilakoutas K, Waldron P . Shear resistance of FRP RC beams: experimental study[J]. Journal of Composites for Construction, 2006,10(6):464-473.
[9]	Jang H, Kim M, Cho J , et al. Concrete shear strength of beams reinforced with FRP bars according to flexural ratio and shear span to depth ratio[C]// FRPRCS-9. 2016.
[10]	Olivito R S, Zuccarello F A . On the shear behaviour of concrete beams reinforced by carbon fibre-reinforced polymer bars: an experimental investigation by means of acoustic emission technique[J]. Strain, 2010,46(5):470-81.
[11]	Bentz E C, Massam L, Collins M P . Shear strength of large concrete members with FRP reinforcement[J]. Journal of Composites for Construction, 2010,14(6):637-646. doi: 10.3390/polym10040376 pmid: 30966411
[12]	Razaqpur A G, Spadea S. Resistenza a taglio di elementi di calcetruzzo rinforzati con barree staffe di FRP[C]// Proc 29th AIAS Nat Conf. 2010: 1334-1345.
[13]	Maruyama K, Zhao W J. Flexural and shear behaviour of concrete beams reinforced with FRP rods [M]. Sheffield: Sheffield Academic Press, 1994: 1330-1339.
[14]	Nakamura H, Higai T . Evaluation of shear strength of concrete beams reinforced with FRP[J]. Concr Libr JSCE, 1995,26:111-123. doi: 10.3390/ma11122596 pmid: 30572692
[15]	Zhao W J, Maruyama K, Suzuky H. Shear behavior of concrete beams reinforced by FRP rods as longitudinal and shear reinforcement[C]// FRPRCS-2. 1995: 352-359.
[16]	Maruyama K, Zhao W J. Size effect in shear behavior of FRP reinforced concrete beams[C]// 2nd Int Conf on Advanced Composite Materials in Bridges and Structure. 1996: 227-234.
[17]	Duranovic N, Pilakoutas K, Waldron P . Tests on concrete beams reinforced with glass fiber reinforced plastic bars[M]. Sapporo: Japan Concrete Institute, 1997: 479-486.
[18]	Alkhrdaji T, Wideman M, Belarbi A , et al. Shear strength of RC beams and slabs[M]. Netherlands: Balkema Publishers, 2001: 409-414.
[19]	Niewels J . Zum tragverhalten von botonbauteilen mitfaserverbundkunststoff-bewerhung [D]. Nordrhein-Westfalen: Aachen University, 2008.
[20]	Alsayed S H . Flexural behaviour of concrete beams reinforced with GFRP bars[J]. Cement & Concrete Composites, 2010,20(5):460-469.
[21]	Spadea S . Comportamento di elementi di calcestruzzo armato conbarre di materiale composito fibrorinforzato[D]. Fisciano: University of Salerno, 2010.