An analysis of survey results found that eighty-three percent of participating buildings
received visual inspections, but only thrity-eight percent had intrusive inspections aimed at
finding connection damage and only eighteen percent had testing. At least eighteen of one
hundred and thrity-three participating buildings suffered observed, steel frame damage.
FIfty-five percent of tested buildings had connection damage. Steel frame damage was
concentrated in buildings of between 200,000 and 300,000 square feet in size, in buildings
constructed during the 1980's, and in buildings under five stories or between eleven and
twenty stories in height. Buildings expposed to peak graound accelerations of .25 g to .35 g, to
peak ground velocity of 20 to 25 cm. per sec, showed a relatively high, steel frame damage
prevalence. Steel frame building damage, as well as the inspection and repair processes
disrupted building operations. However, building owners used innovative strategies to
monimize service interruption. At the time of the survey external forces influenced building
inspections. On one hand, uncertainties, over proposed ordinances, delayed in-depth inspections.
On the other hand, industry actors, such as lenders, insurers and out of state owners,
required steel frame testing.
SAC Steel Project
c/o Earthquake Engineering Research Center
1301 South 46th Street
Richmond, CA 94804
FAX: (510) 231-5664