复杂环境作用下BFRP筋疲劳性能试验研究
发布时间：2019-06-26 14:16
【摘要】：玄武岩增强纤维复合材料(BFRP)作为国家重点发展的三大高新增强纤维复合材料,具有轻质高强、耐腐蚀和非磁性等优点,具有逐步代替建筑结构的内部钢筋形成BFRP筋增强体系的巨大潜力。本文在试验研究和理论推导的基础上,对不同腐蚀环境作用下BFRP筋的疲劳性能进行了研究,主要包括以下三方面内容:对处于酸碱腐蚀环境及模拟火灾环境作用下的BFRP筋进行了力学性能试验研究,分析观察了筋材在不同腐蚀环境作用下的的外观变化形态及破坏模式;获得了弹性模量、极限应变、抗压强度、抗剪强度、抗拉强度等材料力学性能参数随环境变化的变化规律,并绘制了BFRP筋室温作用下的应力应变曲线。对单点-成组法进行了改进,得到了BFRP筋在不同温度作用下的S-N曲线,结合回归分析方法构造了对应的实现算法;观察了不同温度作用下BFRP筋的外观状态和疲劳破坏模式;根据不同温度作用下筋材的疲劳试验结果,分析了不同温度对构件疲劳寿命的影响,并建立了相应的P-S-N曲线和γ-P-S-N曲线模型,揭示了不同可靠度条件下不同温度对筋材疲劳寿命的影响规律。利用相关系数优化法,对单点-似然法进行了改进,得到了BFRP筋在不同腐蚀时间作用下的S-N曲线;结合回归分析方法,构造了与之对应的实现算法;观察了不同腐蚀时间作用下筋材的外观状态和疲劳破坏模式;根据不同腐蚀时间作用下筋材的疲劳试验结果,得到了疲劳寿命随腐蚀时间变化的变化规律,并建立了BFRP筋相应的P-S-N和γ-P-S-N曲线模型;建立了在不同腐蚀时间作用下BFRP筋的t-P-S-N曲面模型,对估算不同腐蚀时间作用后BFRP筋的疲劳寿命提供重要价值。
[Abstract]:Basalt reinforced fiber composite (BFRP), as the three high and new reinforced fiber composites developed by the state, has the advantages of light and high strength, corrosion resistance and non-magnetism, and has great potential to gradually replace the internal steel bar of building structure to form BFRP reinforcement system. On the basis of experimental study and theoretical derivation, the fatigue properties of BFRP tendons under different corrosion environments are studied in this paper, including the following three aspects: the mechanical properties of BFRP tendons in acid-base corrosion environment and simulated fire environment are studied, and the appearance change form and failure mode of BFRP tendons under different corrosion environments are analyzed and observed. The variation of mechanical properties of materials such as elastic modulus, ultimate strain, compressive strength, shear strength and tensile strength with the environment was obtained, and the stress-strain curves of BFRP tendons at room temperature were drawn. The single point group method is improved, the S 鈮，
本文编号：2506247
[Abstract]:Basalt reinforced fiber composite (BFRP), as the three high and new reinforced fiber composites developed by the state, has the advantages of light and high strength, corrosion resistance and non-magnetism, and has great potential to gradually replace the internal steel bar of building structure to form BFRP reinforcement system. On the basis of experimental study and theoretical derivation, the fatigue properties of BFRP tendons under different corrosion environments are studied in this paper, including the following three aspects: the mechanical properties of BFRP tendons in acid-base corrosion environment and simulated fire environment are studied, and the appearance change form and failure mode of BFRP tendons under different corrosion environments are analyzed and observed. The variation of mechanical properties of materials such as elastic modulus, ultimate strain, compressive strength, shear strength and tensile strength with the environment was obtained, and the stress-strain curves of BFRP tendons at room temperature were drawn. The single point group method is improved, the S 鈮，
本文编号：2506247
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