The analysis process is the same whatever the material, steel or concrete. And, in today’s world that means a few computer runs to adjust member sizes and stiffness’. Then, in concrete it becomes a whole bunch of beam/columns and connections btwn. beams and columns with the appropriate reinforcing for the moments and axial loads at each joint or in each member. And, that is right out of your basic RC design textbook. You could take a look at strut and tie design methods in concrete too. Then talk with a contractor about how he might form such a critter, you might want 45° corner transitions btwn. members at each joint.
