Abstract
A performance based design criteria for seismic rehabilitation requires considerable communication with building owners to develop a mutual understanding of the design constraints and the product that is delivered. This communication becomes even more complex when the goal is to minimize the occupant disruption. This paper presents a discussion of two seismic rehabilitation projects in Southern California where minimizing occupant disruption was essential and where the seismic design was a performance based design. One building was a midrise concrete-frame building housing computer facilities and executive personnel. The other building was an unreinforced masonry residence for business and movie professionals. In both situations base isolation was the best design solution.
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