McIntosh Humanities Building
California State University, Long Beach Long Beach, California
Our firm was retained to perform a seismic evaluation on the nine-story 1960s non-ductile concrete shear wall building and to develop a retrofit program to address life-safety concerns. Initial assessments identified many of the seismic deficiencies that one comes to expect in older concrete buildings such as discontinuous shear walls, inadequate shear reinforcement, conventionally reinforced coupling beams and short lap splices. More detailed analysis using the latest on-going research results, specifically developed for seismic evaluation and retrofit of existing buildings, permitted us to assess the significance of each perceived problem. Once the significance of the deficiencies had been established, solutions to mitigate
these deficiencies were developed using strengthening techniques examined during the research programs. This allowed us to develop a retrofit scheme that only addressed issues that were of real concern. The end result was a proposed rehabilitation plan, which was significantly less extensive than anticipated.