RattlinBog
Structural
- May 27, 2022
- 185
Wanted to give a heads up about a known limitation in RisaCalc. I checked with Risa support, and they confirmed this. They have a pending request to fix it or add a toggle feature.
According to ACI 318-19 Sect. 13.2.6.2, it's permissible to neglect the size effect factor (lambda_s) for footing one-way and two-way shear design. The size effect factor can apply a significant penalty to your shear strength as reinforcement depth increases. Anyway, ACI allows us to ignore the factor for footing design. (Size effect factor is found in Sect. 22.5.5.1.3)
However, RisaCalc DOES apply the size effect factor in their spread footing module for one-way and two-way shear. It cannot be toggled off. I found this on accident when I was comparing RisaCalc results with my hand calculations. The two-way shear strength was about 160 kips less in RisaCalc...
According to ACI 318-19 Sect. 13.2.6.2, it's permissible to neglect the size effect factor (lambda_s) for footing one-way and two-way shear design. The size effect factor can apply a significant penalty to your shear strength as reinforcement depth increases. Anyway, ACI allows us to ignore the factor for footing design. (Size effect factor is found in Sect. 22.5.5.1.3)
However, RisaCalc DOES apply the size effect factor in their spread footing module for one-way and two-way shear. It cannot be toggled off. I found this on accident when I was comparing RisaCalc results with my hand calculations. The two-way shear strength was about 160 kips less in RisaCalc...
