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I'm an old codger with over 50 years of good engineering experience. I'm still actively designing. Most of my work, now is related to structural steel connections, but my experience is very wide. The reason for joining this site, is that there is an engineer in Vietnam that has a very irregular building 'footprint' (shape) and is seeking advice for locating expansion (control) joints. The joints are not constrained by dimension, but are determined by the irregularity. Thanks. Dik