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首页> 外文期刊>Journal of aerospace engineering >Creep Rupture Performance of Basalt Fiber-Reinforced Polymer Bars
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Creep Rupture Performance of Basalt Fiber-Reinforced Polymer Bars

机译：玄武岩纤维增强聚合物棒的蠕变破裂性能

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Fiber reinforced polymer (FRP) composite bars are suitable substitutes for steel reinforcement in structural concrete because of their light weight and high specific strength and stiffness. Sustained load on FRP composites over the entire service life of the structure can cause failure by creep rupture at loads much smaller than those corresponding to static transient loads. Creep rupture test methods used by several researchers are presented, and a suitable loading arrangement and test method were selected for this study. The creep rupture properties of basalt FRP bars were determined using sustained loading applied to the test specimens simultaneously with an alkaline solution at an elevated temperature. The tests were based on the method specified by the American Concrete Institute (ACI) in a standard. The ultimate creep rupture strength coefficients for basalt FRP bars were determined to be approximately 18% for 50 year service life and 28% for 5 year service life. The corresponding one million hour creep coefficient was estimated to be 13%. One standard specified that creep rupture stress limits are constant regardless of the duration of the service life of the structure. Such an approach leads to conservative designs, particularly for structures with short service lives. It is recommended that time-dependent creep rupture stress limits be used in the design of structures with short service life so as to utilize the strength of FRP bars more effectively. Design creep rupture stress limits for basalt FRP bars are suggested based on the test results of this study and varying safety factors that are dependent on the duration of service life. (C) 2014 American Society of Civil Engineers.
机译：纤维增强聚合物（FRP）复合棒由于重量轻，比强度和刚度高，因此是结构混凝土中钢筋的合适替代品。在结构的整个使用寿命中，FRP复合材料承受的持续载荷会因蠕变断裂而导致破坏，而蠕变断裂的载荷要远小于对应于静态瞬态载荷的载荷。介绍了几位研究人员使用的蠕变断裂测试方法，并为该研究选择了合适的加载方式和测试方法。玄武岩FRP钢筋的蠕变断裂特性是通过在高温下与碱性溶液同时施加于试样的持续载荷来确定的。测试基于美国混凝土协会（ACI）在标准中指定的方法。玄武岩FRP筋的极限蠕变断裂强度系数确定为50年使用寿命约为18％，5年使用寿命约为28％。相应的一百万小时蠕变系数估计为13％。一种标准规定蠕变断裂应力极限是恒定的，而不管结构使用寿命的长短。这种方法导致设计保守，特别是对于使用寿命短的结构。建议在使用寿命短的结构设计中使用随时间变化的蠕变断裂应力极限，以便更有效地利用FRP筋的强度。根据这项研究的测试结果以及取决于使用寿命的变化的安全系数，提出了玄武岩FRP筋的设计蠕变断裂应力极限。 （C）2014年美国土木工程师学会。

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