Experimental study on the flexural performance of reinforced concrete beams strengthened by composite method

被引：0
|
作者：
Tang Y. [1 ]
Lu H. [2 ]
Zou Y. [3 ]
Zeng Y. [2 ]
Wu G. [2 ]
机构：
[1] College of Civil Engineering, Nanjing Forestry University, Nanjing
[2] Key Laboratory for Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing
[3] Jiangxi Ganyue Expressway Co., Ltd., Nanchang
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2020年 / 50卷 / 05期
关键词：
Combined strengthening; Fiber-reinforced composite; Flexural performance; Prestressed high strength steel wire rope; Reinforced concrete (RC) beam;
D O I：
10.3969/j.issn.1001-0505.2020.05.005
中图分类号：
学科分类号：
摘要：
Two combined strengthening methods were proposed based on the concept of inner + outer (refers to the near surface mounted (NSM) fiber reinforced polymer (FRP) bar+externally prestressed high strength steel wire rope) and surface + outer (refers to bonded FRP sheet + externally prestressed high strength steel wire rope). The procedures of the combined strengthening methods were introduced, and the flexural performance of the combined strengthened concrete beams was experimentally studied. Test results show that the inner + outer and surface+outer combined strengthening methods can significantly improve the crack load, yield load, maximum flexural capacity, and flexural stiffness of the RC beam, while not reducing the ductility of the beam. The deboning failure mode of the FRP reinforcements is suppressed, hence the utilization rate of the strength of the reinforcement is improved. Further theoretical analyses show that the theoretical failure mode and the ultimate bearing capacity of the reinforced beam agree well with the test results. The calculation theory can provide a relatively accurate evaluation for the strengthened beam in regards to the limit state of its bearing capacity. © 2020, Editorial Department of Journal of Southeast University. All right reserved.
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页码：822 / 830
页数：8
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