An experimental investigation on flexural behavior of RC beams strengthened with prestressed CFRP strips using a durable anchorage system
An experimental investigation on flexural behavior of RC beams strengthened with prestressed CFRP strips using a durable anchorage system
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DOI：
10.1016/j.compositesb.2012.05.030
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发表时间：
2012-12
影响因子：
13.1
通讯作者：
Young-chan You;Ki-Sun Choi;Junhee Kim
中科院分区：
文献类型：
--
作者：
Young-chan You;Ki-Sun Choi;Junhee Kim
研究了预应力碳纤维复合材料（CFRP）加固钢筋混凝土梁的有效性和可行性。建议的预应力系统与一种新的锚具允许利用的碳纤维布带的全部容量。对8根小尺寸和2根大尺寸混凝土梁进行了预应力碳纤维布加固的静载试验。考虑的主要参数包括施加的预应力水平，范围从20%到70%的CFRP带的拉伸强度，和使用机械锚固在两端的CFRP带。由于持久锚固，全方位的弯曲行为进行了调查，包括后脱粘。结果表明，当预应力水平增加到一定程度时，使用预应力CFRP带加固的梁表现出更高的首次开裂、钢屈服和实验名义力矩。在分析了小尺寸试验中预应力效应的基础上，提出了碳纤维布加固混凝土梁的最佳预应力水平，并在大尺寸试验中进行了验证。
This paper investigates the effectiveness and feasibility of a prestressed carbon fiber-reinforced polymer (CFRP) system for strengthening reinforced concrete (RC) beams. The proposed prestressing system with a novel anchorage allows the utilization of full capacity of the CFRP strips. Eight small-scale and two large-scale concrete beams strengthened different configuration of prestressed CFRP strips are tested under static loading conditions up to failure. The main parameters considered include the level of prestressing applied, ranging from 20% to 70% of the tensile strength of the CFRP strips, and the use of mechanical anchorages at both ends of the CFRP strips. Thanks to the durable anchorage, the full range of flexural behavior was investigated including post-debonding. The results indicate that the beams strengthened using prestressed CFRP strips exhibited a higher first-cracking, steel-yielding, and experimental nominal moments as the level of prestressing force increased up to a certain point. After analyzing prestress effects in small scale tests, an optimum prestress level for strengthening concrete beams using CFRP strips is proposed and verified in large scale tests.