Influence of Separation on Flexural Performance of Reinforced Concrete Beams Reinforced by Carbon Fiber Reinforced Polymer Sheets

玻璃钢 Pub Date : 1999-08-01 DOI:10.14359/5688

T. Kage, Y. Masuda, T. Ina

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引用次数: 1

Abstract

In this study, it was investigated experimentally that flexural performance of RC beam reinforced by using CFRP sheet which has separation of CFRP sheet caused by secular degradation or substandard execution. The specimens were RC beams with several conditions of CFRP sheet separation at bending span and strengthening methods by CFRP sheet at anchorage. The bending test of RC beams and the adhesion test of CFRP sheet were performed. The strength of RC beam was improved by CFRP sheet strengthening in comparison with conventional RC beam and estimated by existing methods. The adhesive strength between CFRP sheet and concrete at the anchorage zone were 1.12-2.53 MPa, which were the same value as tensile concrete strength and enough. When separation occurred between CFRP sheet and concrete at bending span of RC beams, the flexural behavior of RC beams, especially about strain or stress distribution of CFRP sheet, was influenced by methods of anchorage and characteristic property of concrete at the anchorage zone. And it was confirmed no effects of preventing the progress of crack in this case. We could say that it was necessary to pay attention in case of using CFRP sheet for repairing RC member deterioration by rebar corrosion or crack.

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分离对碳纤维增强聚合物板加固钢筋混凝土梁抗弯性能的影响

本文对碳纤维布加固梁的抗弯性能进行了试验研究，研究了碳纤维布因长期劣化或施工不合格而发生分离的情况。试件为钢筋混凝土梁，在弯曲跨处采用碳纤维布分离，在锚固处采用碳纤维布加固。进行了钢筋混凝土梁的弯曲试验和碳纤维布的粘结试验。与常规钢筋混凝土梁相比，采用碳纤维布加固提高了钢筋混凝土梁的强度，并采用现有方法进行了估算。锚固区CFRP片材与混凝土的粘结强度为1.12 ~ 2.53 MPa，与混凝土抗拉强度相同，足够。当钢筋混凝土梁在弯跨处发生碳纤维布与混凝土分离时，钢筋混凝土梁的受弯性能，特别是碳纤维布的应变或应力分布受锚固方式和锚固区混凝土特性的影响。在这种情况下，证实了它对防止裂缝的进展没有效果。因此，在使用碳纤维布修复钢筋锈蚀或开裂的混凝土构件时，应引起重视。

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玻璃钢

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357