>Presents the results of an experimental investigation addressing the variations in transfer lengths in two types of carbon fiber reinforced polymer (CFRP) prestressing strands. Parameters such as the level of prestress at release, creep, and the rate and method of release of prestress are considered. In all, eight double-T (DT) prestressed girders fabricated with high strength concrete were tested. Four DT girders were prestressed with CFRP Lead/me tendons while the other four DT girders were prestressed with carbon fiber composite cable (CFCC) strands. Based on the experimental results, a proposed modification in an available model for predicting the transfer length of CFRP Leadline tendons and CFCC strands is suggested. A comparison of results for the transfer length obtained using the proposed modification with those of others is made. It is shown that the calculated and measured transfer lengths are in close agreement with those obtained by others in the case of Leadline tendons only. It is also noted that the level of release of prestress has no significant effect on transfer length.
展开▼
机译：>提供了针对两种类型的碳纤维增强聚合物（CFRP）预应力股的传递长度变化的实验研究结果。考虑诸如释放时的预应力水平，蠕变以及预应力释放的速率和方法之类的参数。总共测试了八根用高强度混凝土制成的双T（DT）预应力大梁。四个DT梁用CFRP Lead / me筋预应力，而其他四个DT梁用碳纤维复合电缆（CFCC）绳预应力。基于实验结果，建议在可用模型中对CFRP导联腱和CFCC股线的传输长度进行预测的改进方案。将使用建议的修改获得的传输长度结果与其他结果进行了比较。结果表明，所计算和测得的传输长度与仅在引线筋的情况下所获得的传输长度非常接近。还应注意，预应力的释放水平对传递长度没有显着影响。
展开▼
