I'm using the program to check a pedestrian bridge approach structure for lateral seismic loading. The section is basically a tall, narrow hollow box (20' tall and 10' wide) and is supported by 24" drilled shafts. The lateral seismic loading produces reactions at the drilled shaft supports...
When incorporating a footing 'key' into a cantilever retaining wall footing, is it appropriate to increase the coefficient of friction to a 'soil/soil' interface value as opposed to the 'soil/concrete' value for sliding reisitance? If so, what is a reasonable value to use, (tangent of soil...
