| 温度、预拉力和冲击能量耦合作用下BFRP筋的抗冲击性能 |
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| 引用本文： | 李晟,李振坤,郭帅成,朱德举.温度、预拉力和冲击能量耦合作用下BFRP筋的抗冲击性能[J].中国公路学报,2022,35(2):106-114. |
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| 作者姓名： | 李晟 李振坤 郭帅成 朱德举 |
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| 作者单位： | 1. 湖南大学 土木工程学院 绿色先进土木工程材料及应用技术湖南省重点实验室, 湖南 长沙 410082;2. 湖南大学 湖南省绿色先进土木工程材料国际科技创新合作基地, 湖南 长沙 410082;3. 湖南大学 建筑安全与节能教育部重点实验室, 湖南 长沙 410082 |
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| 基金项目： | 国家自然科学基金项目(U1806225,51778220);湖湘高层次人才聚集工程-创新人才(2018RS3057); 湖南省高新技术产业科技创新引领计划项目(2020GK2079);中央高校基本科研业务费专项资金项目(531118010493) |
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| 摘 要： | 为评估玄武岩纤维增强复合材料(Basalt Fiber Reinforced Polymer,BFRP)筋在服役条件下的抗横向冲击性能,通过落锤冲击试验研究了不同温度(-20℃、25℃、50℃和90℃)、冲击能量(12.76 J、19.14 J和31.90 J)和预拉力水平(2％、20％和30％)耦合作用下BFRP筋的...
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| 关 键 词： | 桥梁工程 BFRP筋 落锤冲击试验 横向冲击 抗冲击性能 温度 预拉力 冲击能量 |
| 收稿时间： | 2021-06-10 |
Impact Resistance of BFRP Bars Under Coupling Effects of Temperatures,Pretensions and Impact Energies |
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| LI Sheng,LI Zhen-kun,GUO Shuai-cheng,ZHU De-ju.Impact Resistance of BFRP Bars Under Coupling Effects of Temperatures,Pretensions and Impact Energies[J].China Journal of Highway and Transport,2022,35(2):106-114. |
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| Authors: | LI Sheng LI Zhen-kun GUO Shuai-cheng ZHU De-ju |
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| Affiliation: | 1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;2. International Science Innovation Collaboration Base for Green & Advanced Civil Engineering Materials of Hunan Province, Hunan University, Changsha 410082, Hunan, China;3. Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, Changsha 410082, Hunan, China |
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| Abstract: | In order to evaluate the lateral impact resistance of Basalt Fiber Reinforced Polymer (BFRP) bar under service conditions, the drop-weight impact test of the BFRP bar was conducted to examine the low-velocity impact response and failure mode under different temperatures (-20℃, 25℃, 50℃ and 90℃), pretension ratios (2%, 20%, and 30%) and impact energies (12.76 J, 19.14 J and 31.90 J). Moreover, the residual tensile strength of the incompletely fractured bars was also measured. The test results indicates that:Under the coupling effects of temperature and impact energy, the influence of temperature on the peak force is insignificant, and the residual deformation and dissipated energy increases with the temperature; At the same temperature, the peak force and the residual deformation both increase with impact energy. Under the coupling effects of temperature and pretension loading, the influence of pre-stress on the peak force is more significant than that of temperature. At the same temperature, the residual deformation and dissipated energy decreased with the pre-stress level. Under the same pre-stress level, the residual deformation increased slightly with the temperature while the dissipated energy first decreased and then increased with the temperature. The impact damage level of BFRP bars can be appropriately evaluated with the residual tensile strength and dissipated energy ratio. The residual tensile strength first increased and then decreased with the temperature under same pre-stress level. The dissipated energy ratio of the specimen decreased with the pre-stress level when the energy keeps constant, which indicates that the applied pretension loading reduces the impact damage of specimen. The impact damage level of BFRP bars increased with the impact energy, and the failure modes include matrix indentation, matrix cracking, fiber fracture and pull-out. The failure mode of specimen is mainly affected by the impact energy, and influence of the temperature and pretension are insignificant. The results from this study can provide practical reference for the design of long-span bridge FRP cables under complex service conditions, and further promote the application of BFRP bar in bridge engineering. |
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| Keywords: | bridge engineering BFRP bar drop-weight impact test lateral impact impact resistance temperature pretension impact energy |
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