Experimental study on influence of composite reinforcement layer length on flexural behavior of reinforced concrete beams strengthened with PVA-RFCC

被引：0

作者：

Du W. ^{[1
]}

Yang C. ^{[1
,2
]}

Wang C. ^{[1
]}

Pan Y. ^{[3
]}

Meng C. ^{[3
]}

机构：

[1] Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing

[2] College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan

[3] Jiangsu Eastern Expressway Management Co., Ltd., Yancheng

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2020年 / 50卷 / 01期

关键词：

Composite reinforcement layer length; Ductility; Equivalent calculation method; Flexural behavior; Polyvinyl alcohol fiber reinforced ferrocement cementitious composite(PVA-RFCC);

D O I：

10.3969/j.issn.1001-0505.2020.01.009

中图分类号：

学科分类号：

摘要：

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. © 2020, Editorial Department of Journal of Southeast University. All right reserved.

引用

页码：64 / 70

页数：6

共 15 条

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