|Table of Contents|

End anchor CFRP grid U-hoop reinforced RC box girder bending performance test(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年02期
Page:
93-101
Research Field:
建筑结构
Publishing date:

Info

Title:
End anchor CFRP grid U-hoop reinforced RC box girder bending performance test
Author(s):
ZHONG Zhengqiang1; 2;  LIU Jun1;  GUO Kaijun1;  CHEN Zimu1
(1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2. Hunan Province Engineering Laboratory for Safety Control of Bridge Structures, Changsha University of Science & Technology, Changsha 410114, Hunan, China)
Keywords:
CFRP grid;  U-hoop;  combination reinforcement;  reinforced concrete box girder;  bending test
PACS:
TU375.1
DOI:
10.19815/j.jace.2023.04010
Abstract:
In order to study the interface mechanism and failure mode of reinforced concrete box girder reinforced with polymer mortar(PCM)-carbon fiber reinforced composite material(CFRP)grid U-hoop reinforcement in the bending process, and to deeply explore the bending reinforcement effect and the force of the grid U-hoop under different reinforcement methods, four-point bending static loading test was carried out on five box-shaped reinforced concrete beams. The results show that after using CFRP grid U-hoop for end anchoring, the bending bearing capacity of the box girder and the tensile utilization rate of the bottom CFRP grid are further improved, and the bending capacity of 45° oblique U-hoop with a width of 120 mm is increased by 18.4% compared with that of FT specimen(specimen reinforced only with longitudinal CFRP grid), and the maximum strain of CFRP bottom grid is increased by 93.1%. The PCM-CFRP grid combination reinforcement system has good common force performance with the steel bar, which can effectively delay the steel bar into the yield stage. When 90° U-hoop is used to anchor the end of the box girder, the failure mode is the middle peel failure between the PCM-CFRP grid composite layer and the concrete, while the specimen reinforced with 45° oblique U-hoop anchorage does not have the middle peel and the crushing of concrete in the compression area under the same load, indicating that it can effectively limit the occurrence of middle peel failure. The larger the width of the U-hoop, the better the reinforcement effect of the 45° oblique U-hoop, but the ductility of the specimen reinforced with a 90° U-hoop is better than that of 45° U-hoop.

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Last Update: 2025-03-20