Seismic Upgrading - Retrofitting of Buildings

Designed with precast prestressed girders, the structure was under construction during the Northridge earthquake. A similarly designed parking structure, which collapsed during this seismic event, showed a lack of reinforcement at shear walls. Design engineers decided that short post-tensioned DYWIDAG Bars (THREADBAR^®), placed inside holes drilled along existing shear walls, would compensate for reinforcing steel deficiency.