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首页> 外文期刊>Magazine of Concrete Research >Retrofitting of defected reinforced-concrete cantilever slabs using different techniques
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Retrofitting of defected reinforced-concrete cantilever slabs using different techniques

机译：用不同技术改造缺陷的钢筋混凝土悬臂板

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摘要

This paper presents the experimental findings for different strengthening techniques applied on defected reinforced-concrete cantilever slabs to restore lost flexural capacities owing to insufficient bond length of the main tensile steel. The restoration technique was based on compensation of the main tensile steel by near-surface mounted steel bars, externally bonded steel plates or externally bonded carbon fibre-reinforced polymer sheets. In addition, new hybrid techniques are presented, which merge the traditional techniques with a 20 mm thick ultrahigh-performance strain-hardening cementitious composites (UHP-SHCC) layer. It was found that the strengthening technique based on the embedded steel bars on the UHP-SHCC overlay enabled the strengthened slab to restore its lost capacity and outperformed it by about 5% compared to that of the properly detailed slab. Nevertheless, this restoration was at the expense of the exhibited ductility. Conversely, the strengthening technique based on the application of externally bonded steel plates on a transition layer of the UHP-SHCC material enabled the strengthened slab to restore the lost capacity by about 96% as well as to outperform its ductility by more than 29% compared to those of the properly detailed slab.
机译：本文介绍了应用于缺陷的增强混凝土悬臂板的不同强化技术的实验结果，以恢复由于主要拉伸钢的粘接长度不足的抗弯曲能力。恢复技术基于通过近表面安装钢筋，外粘合的钢板或外部粘合的碳纤维增强聚合物片来补偿主拉伸钢。此外，提出了新的混合动力技术，其合并了具有20mm厚的超高性能应变硬化水泥复合材料（UHP-SHCC）层的传统技术。发现基于UHP-SHCC覆盖层上的基于嵌入钢筋的强化技术使得强化的板坯能够恢复其损失容量并与适当的详细的板坯相比优于5％。尽管如此，这种恢复为展出的延展性牺牲。相反，基于UHP-SHCM材料的过渡层在外部粘合钢板上施加的强化技术使得加强的板坯将损失容量恢复约96％，并且比比较超过29％的延展性到那些正确详细的板坯。

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