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Shear Wall Tests - Static vs. Dynamic

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In the latest ASCE Structural Journal there is a paper comparing static and 
dynamic response of wood shear walls. ("Comparison of Static and Dynamic 
Response of Timber Shear Walls," by David Dinehart and Harry Shenton, III.)  
Tests were performed on plywood and OSB sheathed 8' X 8' shear walls.

Summarizing the conclusions:

-  Ductility in dynamic tests, as indicated by the displacement at which 
ultimate load occurs, is between 32 and 42 less than in static tests.

-  The damage and failure mode of the wall is very different in the static 
and dynamic tests.

-  There is nearly a 30 percent decrease between the static load factor and 
the fourth cycle load factor.

-  The allowable loads for sheathing greater than 3/8" should be reduced by 
25 percent.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona