leighcheri
Structural
- Oct 19, 2005
- 4
I posted this question in the Structural Engineering forum but thought I would try here too:
I'm designing cast in place footings for a precast 3-sided culvert using LRFD and am looking for a design example. I want to include live load in the vertical stress calculation but I'm not sure if I should distribute it over 1 ft "strips" and apply the Strength I factor of 1.75 or if I should estimate it as a surcharge and apply the EV factor of 1.35 (AASHTO LRFD Figure C11.5.5-1).
I'm using HS-20 loading and the soil engineer gave me the ultimate bearing capacity of the foundation soil with a resistance factor of 0.45.
I'm designing cast in place footings for a precast 3-sided culvert using LRFD and am looking for a design example. I want to include live load in the vertical stress calculation but I'm not sure if I should distribute it over 1 ft "strips" and apply the Strength I factor of 1.75 or if I should estimate it as a surcharge and apply the EV factor of 1.35 (AASHTO LRFD Figure C11.5.5-1).
I'm using HS-20 loading and the soil engineer gave me the ultimate bearing capacity of the foundation soil with a resistance factor of 0.45.
