I have a project where a 50" square ventilation shaft must be cut into an existing 11'-0" tall concrete sub grade wall that is also acting as grade beam between conrete piers. The opening is centered in the neutral axis of the wall/beam and in the mid span of the wall/beam. The opening is located below the compression area and above the steel in the bottom of the wall. The question now is what kind of forces are going to be around this opening? The top remaining concrete header will be sufficient for the gravity loads above the ventilation shaft, but our biggest concern is the force concentrations around the new opening.
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