BridgeSmith
Structural
- May 22, 2009
- 4,975
AASHTO has the following conditions for the use of methods other than Strut-and-Tie (STM) for deep components (Article 5.8.4.1):
1) The provisions of Article 5.8.2.6 specifying the amount and spacing of crack control reinforcement are met as a minimum;
2) A limit on usable shear capacity is specified;
3) The loading is placed at the appropriate depth of the component relative to the reactions in a manner consistent with the legacy method being used;
4) The method of analysis reflects the disturbed stress field, the behavior of cracked concrete and other nonlinear behavior anticipated at the strength or extreme event limit states.
I think I'm clear on conditions 1) and 3), but not sure whether 2) just means the concrete shear strength has to be limited to some fraction of f'c, or if there's something more required.
I'm completely lost what is required to meet condition 4)
I don't have access to ACI, which I understand is where this originated, so perhaps there's more explanation there?
Rod Smith, P.E., The artist formerly known as HotRod10
1) The provisions of Article 5.8.2.6 specifying the amount and spacing of crack control reinforcement are met as a minimum;
2) A limit on usable shear capacity is specified;
3) The loading is placed at the appropriate depth of the component relative to the reactions in a manner consistent with the legacy method being used;
4) The method of analysis reflects the disturbed stress field, the behavior of cracked concrete and other nonlinear behavior anticipated at the strength or extreme event limit states.
I think I'm clear on conditions 1) and 3), but not sure whether 2) just means the concrete shear strength has to be limited to some fraction of f'c, or if there's something more required.
I'm completely lost what is required to meet condition 4)
I don't have access to ACI, which I understand is where this originated, so perhaps there's more explanation there?
Rod Smith, P.E., The artist formerly known as HotRod10
