[1]杜文平,杨才千,王冲,等.加固层长度对PVA-RFCC加固梁抗弯性能影响的实验研究[J].东南大学学报(自然科学版),2020,50(1):64-70.[doi:10.3969/j.issn.1001-0505.2020.01.009]
 Du Wenping,Yang Caiqian,Wang Chong,et al.Experimental study on influence of composite reinforcement layer length on flexural behavior of reinforced concrete beams strengthened with PVA-RFCC[J].Journal of Southeast University (Natural Science Edition),2020,50(1):64-70.[doi:10.3969/j.issn.1001-0505.2020.01.009]
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加固层长度对PVA-RFCC加固梁抗弯性能影响的实验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第1期
页码:
64-70
栏目:
土木工程
出版日期:
2020-01-13

文章信息/Info

Title:
Experimental study on influence of composite reinforcement layer length on flexural behavior of reinforced concrete beams strengthened with PVA-RFCC
作者:
杜文平1杨才千12王冲1潘勇3孟春麟3
1 东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096; 2 湘潭大学土木工程与力学学院, 湘潭 411100; 3 江苏东部高速公路管理有限公司, 盐城 224002
Author(s):
Du Wenping1 Yang Caiqian12 Wang Chong1 Pan Yong3 Meng Chunlin3
1 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
2 College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411100, China
3 Jiangsu Eastern Expressway Management Co., Ltd., Yancheng 224002, China
关键词:
PVA-RFCC 弯曲性能 加固层长度 延性 等效计算方法
Keywords:
polyvinyl alcohol fiber reinforced ferrocement cementitious composite(PVA-RFCC) flexural behavior composite reinforcement layer length ductility equivalent calculation method
分类号:
TU375.1
DOI:
10.3969/j.issn.1001-0505.2020.01.009
摘要:
为了推广PVA-RFCC在桥梁加固中的运用,针对纤维体积掺量为1.5%的PVA-RFCC加固矩形截面梁开展四点弯实验研究.探讨了加固层长度对该梁弯曲性能及裂缝形态的影响机制,并提出了一种适用于不同加固层长度加固梁的等效计算方法.结果表明,当加固层长度与梁总长度之比(l/L)小于0.5时,极限承载力增长速率小于未加固梁;当l/L>0.5时,极限承载力增长速率明显增加.当l/L<0.7时,位移延性系数呈现出抛物线式波动;当l/L>0.7,位移延性系数骤降.为了保证位移延性系数不大幅度降低的同时改善承载力,建议l/L控制在0.5~0.7之间.理论值与实验值吻合良好,说明该等效计算方法可以运用在不同加固层长度加固梁计算中.
Abstract:
To popularize the application of polyvinyl alcohol fiber reinforced ferrocement cementitious composite(PVA-RFCC)in bridge reinforcement, a four-point bending system was carried out for rectangular beams strengthened by PVA-RFCC with the PVA fiber volume fraction of 1.5%. The influence mechanism of the composite reinforcement layer(CRL)length on the flexural behavior and cracking patterns of strengthened beams was discussed. An equivalent calculation method for the strengthened beams with different CRL lengths was proposed. The results show that when the ratio of the CRL length to the span length of the beam(l/L)is less than 0.5, the growth rate of the ultimate bearing capacity is slower than that of the unstrengthened beam. When l/L was more than 0.5, the growth rate of the ultimate bearing capacity is faster. When l/L is less than 0.7, the displacement ductility index fluctuates parabolically; when l/L is more than 0.7, the displacement ductility index drops abruptly. To ensure the slight decrease in the displacement ductility index and the improvement of the ultimate bearing capacity, l/L is controlled to be 0.5 to 0.7. The calculation results agree well with the theoretical values, showing that the equivalent calculation method can be used in the calculation of strengthened beams with different CRL lengths.

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备注/Memo

备注/Memo:
收稿日期: 2019-06-27.
作者简介: 杜文平(1989—),女,博士生;杨才千(联系人),男,博士,教授,博士生导师,ycqjxx@seu.edu.cn.
基金项目: 湖南省重点研发计划资助项目(2018WK2111)、湖南省创新创业技术投资资助项目(2018GK5028).
引用本文: 杜文平,杨才千,王冲,等.加固层长度对PVA-RFCC加固梁抗弯性能影响的实验研究[J].东南大学学报(自然科学版),2020,50(1):64-70. DOI:10.3969/j.issn.1001-0505.2020.01.009.
更新日期/Last Update: 2020-01-20