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首页> 外文会议>International conference on advanced composite materials in bridges and structures >REINFORCED CONCRETE BEAMS STRENGTHENED USING PRESTRESSED NSM CFRP REINFORCEMENT - EFFECTS OF CFRP GEOMETRY AND FREEZE-THAW EXPOSURE
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REINFORCED CONCRETE BEAMS STRENGTHENED USING PRESTRESSED NSM CFRP REINFORCEMENT - EFFECTS OF CFRP GEOMETRY AND FREEZE-THAW EXPOSURE

机译：使用预应力NSM CFRP增强强化加强混凝土梁 - CFRP几何和冻融暴露的影响

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An experimental investigation considering the effects of freeze-thaw exposure, type of strengthening reinforcements, and prestressing levels was conducted on large-scale Reinforced Concrete (RC) beams strengthened in flexure with prestressed and non-prestressed Near-Surface Mounted (NSM) Carbon Fibre Reinforced Polymer (CFRP) reinforcement. Five simply supported rectangular RC beams were tested under four-point bending static monotonic loading: one unstrengthened control beam, two beams strengthened with non-prestressed NSM CFRP, and two beams strengthened with prestressed NSM CFRP. For the strengthened beams, two types of CFRP reinforcements were used including rebars and strips. The prestressing level is 40% of the manufacturer's ultimate tensile strength of the CFRP reinforcement. The strengthened and unstrengthened beams were cracked to a load 20% above the analytical cracking load before being exposed to 500 freeze-thaw cycles (three cycles per day between +34°C to -34°C). The resulting load-deflection behaviour, strain in CFRP, type of failure, ductility, and energy absorption were compared to the behaviour of similar beams tested without any environmental exposure. The results showed that the freeze-thaw and CFRP geometry have minor effects on the overall flexural behaviour of the beams strengthened with prestressed and non-prestressed NSM CFRP rebars/strips.
机译：考虑到冻融曝光，加固增强型和预应力水平的实验研究在大型钢筋混凝土（RC）梁上进行了预应力和非预应力近表面（NSM）碳纤维的大型钢筋混凝土（RC）梁进行了预应力增强聚合物（CFRP）加固。在四点弯曲的静态单调负载下测试了五个简单的矩形RC梁：一个未经预应力的NSM CFRP加强了一个未加强的控制梁，两个光束和预应力的NSM CFRP加强了两个光束。对于加强光束，使用两种类型的CFRP增强剂，包括钢筋和条带。预应力水平为CFRP加固厂家最终拉伸强度的40％。在暴露于500次冻融循环之前，加强和未经制定的光束在分析裂解载荷高于分析裂化载荷的载荷（每天+ 34℃至-34℃之间的三个循环）上，裂解为20％。将所得的载荷偏转行为，CFRP中的应变，破坏类型，延展性和能量吸收的与在没有任何环境暴露的情况下进行的类似光束的行为进行比较。结果表明，冻融和CFRP几何形状对采用预应力和非预应力NSM CFRP钢筋/条带加强光束的总弯曲行为的微小影响。

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