输电杆塔玻璃钢纤维增强复合材料抗老化性试验研究

研究了输电杆塔用玻璃钢纤维增强复合材料(glass fiber reinforced polymer, GFRP)在热氧老化环境下的抗老化性问题。对未经过任何老化处理的试件和热氧老化后的试件，分别测试其材料拉伸强度、弹性模量、泊松比等参数，并将这些参数进行了对比分析。试验结果表明，热氧老化环境对GFRP材料性能有明显影响，使其强度明显降低、弹性模量和泊松比有所提高，对未经过防护涂料处理试件的材料性能影响更明显。由老化经验公式可得，取强度保持率为50%作为寿终指标时，经过防护涂料处理的试件使用寿命可达35年。对长期暴露在不利环境下的GFRP输电杆塔进行设计时，应考虑外界环境的影响，并进行相应的防护处理。

Experimental Study on Ageing Resistance of Glass Fiber Reinforced Polymer in Transmission Tower

This paper researched the ageing resistance of glass fiber reinforced polymer （GFRP） in transmission tower under thermal oxidative aging environment. The parameters of the not ageing specimen and the thermal oxidative aging specimen were compared and analyzed, such as tensile strength, elastic modulus, Poisson＇s ratio, and so on. The test results show that the thermal oxidative aging environment has obvious influence on the performance of GFRP material, which significantly reduces the strength of GFRP material, and increases the elastic modulus and the Poisson＇s ratio of GFRP material. And the impact of thermal oxidative aging on the material properties of GFRP material without any protective coatings is more significantly than those with protective coatings. According to the experiential formula of ageing, the working life of specimens with protective coatings are up to 35 years, with taking the half of limited strength as index. Therefore, designers should consider the adverse effect of the external environment and take protective treatments appropriately in the design process of the GFRP transmission tower with the long-term exposure to adverse environment.