When I had more hair and less of it was gray, I worked on a project as an assistant engineer doing the calculations for a mixed-use building in San Jose, California. Final design consisted of four stories of wood framing over a concrete podium slab and another level of below-grade parking. At that time, my firm had designed many two- and three-story residential buildings, but common thinking was you switched to steel or concrete for taller structures because of perceived limitations in wood-framed construction.
Detailing the main lateral force-resisting system with plywood shearwalls was a challenge for this project, which was in a high seismic area. We had to develop new details for high-load shearwalls to deal with the loads in the lower levels of the structure, and we quickly realized traditional holdowns would not easily meet the high overturning demands. Uplift restraint was provided by an innovative new Anchor Tie-Down System using high-strength rods, bearing plates and shrinkage compensation devices.