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首页> 外文会议>SP-230; International Symposium on Fiber-Reinforced Polymer(FRP) Reinforcement for Concrete Structures; 20051106-09; Kansas City,MI(US) >GFRP-Bonded RC Beams under Sustained Loading and Tropical Weathering
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GFRP-Bonded RC Beams under Sustained Loading and Tropical Weathering

机译：GFRP粘结的RC梁在持续荷载和热带风化下

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摘要

A study on glass FRP-bonded RC beams subjected to sustained loading undertropical weathering is reported. Beams were observed for long-term deflections and cracking due to sustained loading over different periods of time, after which they were unloaded and subsequently tested to failure. Beams subjected to outdoor tropical weathering for six months showed 8% larger deflections and 15% larger crack widths com pared to those kept under ambient laboratory condition. Under accelerated weathering in a chamber, similar increase in deflections and crack widths were observed. Also, after six months of accelerated weathering, the ultimate flexural strength was about 17% and 12% less for beams bonded with uni- and bi-directional glass FRP laminates, respectively, compared to the un-weathered reference beams. The failure mode changed from concrete crushing to FRP rupture with weathering period, indicating the deterioration of FRP laminates. The effect of weathering was more detrimental in the presence of sustained loads.
机译：据报道，玻璃纤维结合玻璃纤维混凝土梁承受了亚热带风化的持续载荷。观察到梁由于在不同的时间段内承受持续的载荷而长期变形和破裂，然后卸载并随后进行破坏测试。与在环境实验室条件下保持的梁相比，经受了室外热带风化六个月的梁显示出更大的挠度和15％的裂缝宽度。在腔室内加速风化作用下，观察到挠度和裂纹宽度的相似增加。同样，在六个月的加速风化后，与未风化的参考梁相比，单向和双向玻璃FRP层压板粘合的梁的极限抗弯强度分别降低了约17％和12％。破坏模式从混凝土压实转变为FRP随风化时间而破裂，表明FRP层压板的劣化。在持续负载下，风化的影响更有害。

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