朱德举 徐旭锋 郭帅成 沈琰

摘要：采用MTS萬能试验机对不同温度处理后的玄武岩纤维增强复合材料（BFRP）筋和玻璃纤维增强复合材料（GFRP）筋的拉伸和剪切性能进行测试，研究了高温对BFRP筋和GFRP筋力学性能和破坏模式的影响.利用Weibull模型对不同温度处理后BFRP筋和GFRP筋的拉伸强度进行统计分析，采用热重分析仪定量化阐明BFRP筋和GFRP筋的热分解机制.结果表明：高温会导致BFRP筋和GFRP筋发生明显的颜色和形貌变化；BFRP筋和GFRP筋的拉伸强度、极限应变、韧性和剪切强度均随着温度的升高而呈先上升后下降的趋势，而弹性模量变化不明显.与相同温度处理后的GFRP筋相比，BFRP筋的拉伸性能较差，剪切性能较好；BFRP筋和GFRP筋的热分解特性解释了其高温后力学性能的退化机理.

关键词：FRP筋；高温；力学性能；热重分析

中图分类号：TB332文献标志码：A

基金项目：国家自然科学基金山东联合基金项目（U1806225），National Natural Science Foundation of China（U1806225）；国家自然科学基金资助项目（51778220），National Natural Science Foundation of China（51778220）；湖湘高层次人才聚集工程-创新人才项目（2018RS3057），High-level Talent Gathering Project in Hunan Province（2018RS3057）；湖南省高新技术产业科技创新引领计划项目（2020GK2079），High-Tech Industry Science and Technology Innovation Leading Plan of Hunan Province（2020GK2079）

Mechanical Properties of Basalt and Glass Fiber Reinforced Polymer Tendons after Exposed to Elevated Temperatures

ZHU Deju1，2，XU Xufeng1，2，GUO Shuaicheng1，2，SHEN Yan1，2

（1. College of Civil Engineering，Hunan University，Changsha 410082，China；2. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province，Hunan University，Changsha 410082，China）

Abstract：The tensile and shear properties of basalt fiber reinforced polymer（BFRP）and glass fiber reinforced polymer（GFRP）tendons after thermal aging were tested by the universal testing machine，and the effects of elevated temperatures on the mechanical properties and failure mode of BFRP and GFRP tendons were studied. Furthermore，the tensile strengths of BFRP and GFRP tendons after treatment under various elevated temperatures were statistically analyzed by Weibull model，and the thermal degradation mechanism of BFRP and GFRP tendon was quantitatively analyzed by a thermo-gravimetric analyzer. The results show that the color and morphologies of BFRP and GFRP ten-dons change obviously with the elevated temperatures. The tensile strength，ultimate strain，toughness and shear strength of BFRP and GFRP tendons slightly increase firstly and then decrease with the temperature，while the elastic modulusdoesnotchangesignificantly.ComparedwiththeGFRPtendon，theBFRPtendontreatedunderthesametemper-atures exhibits lower tensile properties but better shear performances. The pyrolysis characteristics of BFRP and GFRP tendonsproperlyexplainthedegradationmechanismoftheirmechanical properties after elevated temperatures.

Key words：fiber reinforced polymer（FRP）tendon；elevated temperatures；mechanical properties；thermogravimetric analysis

纤维增强复合材料（Fiber Reinforced Polymer，FRP）因其高比强度、耐腐蚀、耐疲劳、易设计等优异性能被广泛运用于航空航天、国防军工、土木工程等领域[1-2]. FRP可通过粘贴、约束、修补等方式加固既有结构[3-4]；替代钢筋应用于有防腐蚀和防电磁干扰等要求的特殊环境混凝土结构[5]；可加工成型材、筋材、拉索等形式直接作为承载结构[6]；与传统材料进行组合和混杂可提高结构综合性能等[7].根据纤维种类的不同，目前常……