Development Length of High-Strength Straight Bars (550MPa) in Nuclear Power Plant Structures

고강도철근(550MPa)의 원전구조물 적용을 위한 직선철근의 정착설계

Because of the congestion problems, the high-strength reinforcements are expected to be used in nuclear power plant structures in the near future. According to ACI 349-13, it is permitted to use the high-strength(550MPa) straight bars in design of development length, but there is no special equation for high-strength bars. In order to reflect the anchorage capacity and behavior properties of high-strength straight bars with large-diameter(43 & 57mm), it is necessary to find the modified factor or develop the new development length equation for large-size and high-strength bars.