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ACI 350-20 - Ch. 9 vs App. D Comparison

RattlinBog

Structural
Joined
May 27, 2022
Messages
187
Location
US
I'm fairly new to the design requirements of ACI 350-20. I wanted to compare the calculation of load factors and the environmental durability factor, Sd, using both Appendix D and Chapt. 9. App. D is straightforward, but Chapt. 9 is a bit tricky. It looks like Chapt. 9 can be more or less conservative than App. D depending on reinforcement spacing.

Would someone be willing to review my attached example calcs and confirm if I'm on the right track? I only checked flexural stress under fluid loads and normal environmental exposure for the example.
 

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Hi RattlinBog
Your calculations seem valid.
appendix D is more used because of its simplicity,
 

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