Column D is subjected to a vertical load of 8000 lb. It is supported on two identical we...

Column D is subjected to a vertical load of 8000 lb. It is supported on two identical wedges A and B for which the coefficient of static friction at the contacting surfaces between A and B and between B and C is = 0.4. If the forces P and P' are removed, are the wedges self-locking? The contacting surface between A and D is smooth.