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Assessment of the effectiveness of prestressed NSM CFRP laminates for the flexural strengthening of RC beams

机译:评估预应力NSM CFRP层压板对RC梁的抗弯加固效果

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摘要

The flexural behavior of RC beams strengthened with prestressed near-surface-mounted (NSM) carbon-fiber-reinforced-polymer (CFRP) laminate was investigated in this paper. For this purpose, four RC beams were tested under monotonic four-point loading. One beam was kept un-strengthened, as a control beam, and another one was strengthened with a non-prestressed NSM CFRP laminate. The remaining beams were strengthened with NSM CFRP laminates prestressed at 20% and 40% of its ultimate tensile strength. The prestressed NSM CFRP laminate technique provided a significant increment of the load carrying capacity for deflection levels corresponding to serviceability and ultimate limit states. A numerical strategy was also employed to simulate the flexural behavior of the tested RC beams. The experimental and numerical researches are described and the relevant results are presented and discussed.
机译:本文研究了预应力近表面贴装式(NSM)碳纤维增强聚合物(CFRP)层压板增强的RC梁的抗弯性能。为此,在单调四点荷载下测试了四个RC梁。一根梁保持未加强状态,作为控制梁,另一根梁通过未预应力的NSM CFRP层压板进行加固。其余的梁用预应力为其极限抗拉强度的20%和40%的NSM CFRP层压板加固。预应力NSM CFRP层压板技术在挠性水平下提供了显着的承载能力增量,对应于可维修性和极限极限状态。还采用了一种数值策略来模拟所测试的RC梁的弯曲行为。描述了实验和数值研究,并提出和讨论了相关结果。

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