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Re. More questions about rigid plywood diaphragms

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The following research may be of interest to participants on this issue:

CYCLIC PERFORMANCE OF PERFORATED WOOD SHEAR WALLS WITH OVERSIZE OSB PANELS

Journal of Structural Engineering / Jan 1999, 10-18

Abstract: This paper reports the test results from a study investigating the influence 
of openings on the lateral resistance of wood-based shear walls built with both standard 
and oversize oriented strand board panels under monotonic and cyclic loading conditions. 
Test results showed that the application of nonstandard oversize panels significantly 
improved the performance of the perforated shear walls compared with standard 1.2 x 2.4 
m panels.  door and window openings caused a significant decrease in the strength and 
stiffness of the walls and precipitated a change in failure mode, especially for walls 
with oversize panels. Although nail failure modes were commonly observed in walls 
without openings, a combination of nail and panel failures were observed in shear walls 
with opening.  A newly proposed cyclic test protocol was used that consisted of fewer 
but more severe displacement excursions, compared with many other test protocols.  This 
was believed to better reflect typical earthquake excitation and avoid low cycle nail 
fatigue failures, which were observed previously with long sequence cyclic test 
protocols.

James Bela
Oregon Earthquake Awareness