The Pantheon's open roof hole actually strengthens its dome by removing weight at the weakest point
The Pantheon's massive unreinforced concrete dome remains stable because its central circular opening, the oculus, removes significant weight and relieves structural tension at the dome's most vulnerable point.
The Pantheon's 43.3-meter dome, completed around 126 AD, remains the largest unreinforced concrete dome in the world due to the strategic placement of its 8.7-meter oculus. This central aperture reduces the structure's total mass by 30%, specifically removing weight at the haunch where tensile forces peak at 20 MPa. By eliminating the heaviest part of the ceiling, Roman engineers prevented the dome from collapsing under its own gravity.
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