"Evaluating fatigue, relaxation, and creep rupture of carbon-fiber- reinforced polymer strands for highway bridge construction"

IF 0.9 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY PCI Journal Pub Date : 2023-01-01 DOI:10.15554/pcij68.3-01
N. Grace, M. Mohamed, Mena Bebawy
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Abstract

Fatigue strength, relaxation, and creep rupture strength of carbon-fiber-reinforced polymer (CFRP) strands were evaluated experimentally, and their impact on bridge beam design was investigated. The long-term relaxation of CFRP strands was evaluated by loading CFRP test specimens under different environmental conditions and monitoring prestress loss over time. Creep rupture strength of CFRP strands after 1 million hours of sustained stress exposure was predicted by loading and monitoring CFRP test specimens under a range of sustained stress levels for an extended time. The fatigue strength of CFRP strands was established by cyclically loading CFRP test specimens using different stress amplitudes. In addition, and as a benchmark for fatigue evaluation, low-relaxation steel and stainless steel strand test specimens were prepared and cyclically loaded within the fatigue test matrix. Test results showed that fatigue strength of CFRP strands is superior to that of low-relaxation steel and stainless steel prestressing strands. In addition, the one-million-hour relaxation loss of CFRP strands is approximately 2% for a wide range of initial stress levels. Furthermore, the one-million-hour creep rupture strength is at least 88% of the average tensile strength of the strands. Extended exposure to environmental conditions did not seem to affect the tensile capacity of CFRP strands.
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评价公路桥梁建设用碳纤维增强聚合物链的疲劳、松弛和蠕变断裂
试验评估了碳纤维增强聚合物(CFRP)股的疲劳强度、松弛强度和蠕变断裂强度,并研究了它们对桥梁梁设计的影响。通过在不同环境条件下加载CFRP试件并监测随时间的预应力损失来评估CFRP股的长期松弛。通过加载和监测CFRP试件在长时间的持续应力水平下的蠕变断裂强度,预测了CFRP股在100万小时的持续应力暴露后的蠕变断裂强度。通过循环加载不同应力幅值的CFRP试件,建立了CFRP股的疲劳强度。此外,作为疲劳评价的基准,制备了低松弛钢和不锈钢绞线试样,并在疲劳试验基体内循环加载。试验结果表明,CFRP预应力筋的疲劳强度优于低松弛钢和不锈钢预应力筋。此外,在较宽的初始应力水平范围内,CFRP股的100万小时松弛损失约为2%。此外,一百万小时的蠕变断裂强度至少是平均抗拉强度的88%。长时间暴露在环境条件下似乎不影响CFRP股的拉伸能力。
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来源期刊
PCI Journal
PCI Journal 工程技术-结构与建筑技术
自引率
9.10%
发文量
15
审稿时长
>12 weeks
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