I have a single story, flat roof structure with an irregular shape--close to an octagon, for the sake of the question. There is an interior courtyard space, open to the elements. The courtyard is round. As a result, the opening in the roof diaphragm is also round. The opening is about 25% of the overall square footage of the structure. I'm trying to determine chord forces. I know how to determine shear distribution and chord forces for rectangular openings. Any thoughts on how to do this for a circular opening?
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