Little has been presented about the existing small curvature radius U-shaped prestressed tendon,whose practical elongation value and theoretical stretching elongation deviate greatly from each other.

• 基于现有规范小曲率半径U形预应力筋张拉伸长量缺乏陈述,而该类预应力筋实测伸长值和理论伸长值偏差过大。