A fast speed racking test was condusted on plywood sheathed walls and
braced walls. The walls were subjected to +/-100 mm deflection cycles
of sine waves, and triangle waves. The frequencies were 0.125. 0.25. 0
.50, 0.75, and 1 Hz, of which deflection speeds corresponds to 5, 10,
20, 30, and 40 cm/sec. in the cases of triangle waves, and pi/2 times
these speeds in the cases of sine waves. No effect of the deflection s
peed on the racking resistance was observed, The deflection speeds of
wood structures subjected to powerful seismic forces is in the above r
anges. From these results, it can be said that the damping resistance
which is proportional to the deflection speed of a structure should be
ignored in seismic response analyses.