Seismic upgrade of a 3 story unreinforced masonry (URM) building for an
increase in occupancy load.
We performed a complete seismic analysis of the building to conform to the
California Historical Building Code. Instead of adding new or replacing
inadequate lateral force resisting elements, we were able to modify the
existing structural elements to comply with the upgrade requirements. We
increased nailing for several interior plywood shear walls. Two existing
moment frames we reinforced for the upgrade. Additional URM wall pullout
anchors were added to secure the walls to the floor systems.