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RE: Shear Wall Tests - Static vs. Dynamic

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How was the test criteria established. Dynamic and Static tests were also
done for cold-form steel studs (which relates to the 1997 UBC shearwall
values). These tests were done under the test provisions established by
SEAOSC (Graham Dick was the chair of this sub-committee). I believe these to
the accepted criteria for testing and would like to know if ASCE's tests
were comparable?
Dennis Wish PE

-----Original Message-----
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
Sent: Wednesday, May 27, 1998 2:15 PM
To: SEAOC
Subject: Shear Wall Tests - Static vs. Dynamic


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