Tankie
Structural
- Feb 16, 2005
- 7
I don't want to derail the recent thread about the Section 12.5.3 modification factors for footing dowels, so pardon the semi-parallel subject.
The specific case that has me a bit confused is when a hooked bar (hairpin) is used to provide the needed Appendix D reinforcement for anchors in tension. The elevation view of Figure RD.5.2.9 in 318-11 illustrates this case perfectly.
The question that I have is as follows: Can the "excess reinforcement" provision of Section 12.5.3(d) be applied to this hooked anchor reinforcement in order to reduce the standard hook development length ldh?
I'm thinking that it CANNOT be used, since 12.5.3(d) states that this knockdown factor can only be used when "development for fy is not specifically required", and the Appendix D provisions, I believe, would require the anchor reinforcement to be designed based on yield.
Would appreciate your thoughts.
Thanks.
The specific case that has me a bit confused is when a hooked bar (hairpin) is used to provide the needed Appendix D reinforcement for anchors in tension. The elevation view of Figure RD.5.2.9 in 318-11 illustrates this case perfectly.
The question that I have is as follows: Can the "excess reinforcement" provision of Section 12.5.3(d) be applied to this hooked anchor reinforcement in order to reduce the standard hook development length ldh?
I'm thinking that it CANNOT be used, since 12.5.3(d) states that this knockdown factor can only be used when "development for fy is not specifically required", and the Appendix D provisions, I believe, would require the anchor reinforcement to be designed based on yield.
Would appreciate your thoughts.
Thanks.