IBC Table 1808.8.1 specifies that the minimum compressive strength for socketed drilled piers is 4,000 psi. I've routinely seen drilled piers specified as 3,000 psi when longitudinally reinforced with a minimum 0.5% steel cage. This section of IBC does not specify if it is in reference to all...
In the Structural Engineering Reference Manual they give a direct solution for solving for rho for beams with tension reinforcing but they do not derive the formula. This seems like a pretty basic step that I should know but I'm having trouble with the math. I think they're using the quadratic...
