MJC6125
Structural
- Apr 9, 2017
- 120
I'm wondering if section 25.4.10 of ACI 318-14 is applicable for reducing the development (lap) length required in a pedestal anchorage situation where you are attempting to lap steel column base plate anchors with vertical reinforcement in a concrete pedestal. This reduction is the one where you reduce the required development length by the ratio As,required/As,provided.
I have used the Windianto paper called Design of Anchor Reinforcement in Concrete Pedestals for these situations in the past. And in that paper they use the development length reduction per the image below.
However, I'm seeing in ACI 318-14 section 25.5.1.4 that this reduction is not allowed in lap splice situations. I know the pedestal anchorage situation is different than a traditional lap splice, but I'm not 100% sure if it's different enough to where I can consider development length only and neglect the section 25.5 lap splice requirements. Does anyone have any guidance on whether the Ld development length reduction is allowable in the pedestal anchorage situation? If so, why is it acceptable here, but if we were dealing with reinforcement lapping it would not be?
I have used the Windianto paper called Design of Anchor Reinforcement in Concrete Pedestals for these situations in the past. And in that paper they use the development length reduction per the image below.
However, I'm seeing in ACI 318-14 section 25.5.1.4 that this reduction is not allowed in lap splice situations. I know the pedestal anchorage situation is different than a traditional lap splice, but I'm not 100% sure if it's different enough to where I can consider development length only and neglect the section 25.5 lap splice requirements. Does anyone have any guidance on whether the Ld development length reduction is allowable in the pedestal anchorage situation? If so, why is it acceptable here, but if we were dealing with reinforcement lapping it would not be?
