Wood-frame Lean-Over Collapse

03/26/2009
Article and photos by Gregory HavelDownload this article as a PDF!In a "lean-over" collapse of a wood-frame structure, the building's walls are no longer vertical and the structure tilts to one side, although the floors may remain approximately level. This tilt changes the studs' or posts' original axial loading to eccentric loading, which transfers more of the load to the fasteners and makes the structure unstable.A lean-over collapse can occur because the wood mortise-and-tenon joints have dried out and shrunk (in post-and-frame construction); the wood studs have dried out and shrunk and the nails have rusted (in balloon-framed or platform-framed buildings); the foundation is weak or th...

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