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Expansion and seismic joints

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Should you allow enough of a gap in a roof thermal expansion joints (example in single story metal deck) to satisfy the seismic joint requirement as well. I don't usually see this done. Since the buildings are acting separately perpendicular to the joint, I think a seismic joint would be required. Also, is a seismic joint required when 2 buildings that have the same period are next to each other. For example, I am separating 2 buildings by a firewall. Each building butting up against the wall and not connected. If each building is moving at the same period, can they still theoretically smash together in an earthquake?

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