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首页> 外文期刊>Advances in Structural Engineering >Flexural behaviour of glass fibre-reinforced polymer and ultra-high-strength fibre-reinforced concrete composite beams subjected to elevated temperature
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Flexural behaviour of glass fibre-reinforced polymer and ultra-high-strength fibre-reinforced concrete composite beams subjected to elevated temperature

机译：玻璃纤维增​​强聚合物和超高强度纤维增强混凝土复合梁在高温下的抗弯性能

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摘要

Composite beams consisting of pultruded glass fibre-reinforced polymer (GFRP) I-beams and ultra-high-strength fibre-reinforced concrete (UFC) slabs have been developed for use in short-span bridges. Fibre-reinforced polymer bolts (fibre-reinforced polymer threaded rods) and epoxy adhesive were used to connect the UFC slab to the GFRP I-beam. The authors conducted material tests and large-scale static bending tests at room and elevated temperatures (less than 90 degrees C) to investigate the flexural behaviour of GFRP-UFC composite beams subjected to elevated temperature. The test results demonstrated that the mechanical properties of the GFRP I-beams, fibre-reinforced polymer bolts and epoxy adhesive were significantly deteriorated at elevated temperatures due to the glass transition of their polymer resin matrices. As a result, the stiffness and ultimate flexural capacity of the GFRP-UFC composite beams under elevated temperatures were significantly reduced. More than 85% of the flexural capacity of the GFRP-UFC composite beams was retained up to 60 degrees C but that was decreased to 50% at 90 degrees C. Fibre model analysis results confirmed that the stiffness of the GFRP-UFC composite beams is not significantly affected by actual hot environments, where there is a moderate temperature gradient across the beam cross-section.
机译：已经开发出由拉挤玻璃纤维增​​强聚合物（GFRP）工字梁和超高强度纤维增强混凝土（UFC）板组成的复合梁，用于短跨度桥梁。纤维增强的聚合物螺栓（纤维增强的聚合物螺杆）和环氧树脂粘合剂用于将UFC平板连接到GFRP工字梁。作者在室温和高温（低于90摄氏度）下进行了材料测试和大规模的静态弯曲测试，以研究GFRP-UFC复合梁在高温下的弯曲行为。测试结果表明，GFRP工字梁，纤维增强的聚合物螺栓和环氧树脂胶粘剂的机械性能在高温下由于其聚合物树脂基体的玻璃化转变而显着降低。结果，在高温下，GFRP-UFC复合梁的刚度和极限挠曲能力大大降低。 GFRP-UFC复合梁的抗弯承载力在60°C时可保持超过85％的强度，但在90°C时可降低至50％。纤维模型分析结果表明GFRP-UFC复合梁的刚度为不会受到实际高温环境的明显影响，在实际的高温环境下，光束横截面的温度梯度要适中。

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