NEHRP Clearinghouse

Building Strong Motion Earthquake Instrumentation.
Rojahn, C.
National Science Foundation, Washington, DC. Applied Science and Research Applications., January 1976, 17 p.
Based on the recommendations of a special ad-hoc committee, twenty-one geographic areas will be instrumented under the building instrumentation phase of the California Strong-Motion Instrumentation Program, a statewide program established by law in 1971 and funded through an assessment of estimated construction costs collected statewide from building permits. The areas were selected on the basis of population density, locations of buildings already instrumented, and the probability for potentially damaging earthquakes. Buildings to be instrumented will be of typical construction, simple in framing and design, and of various heights with the instrumentation of low-rise buildings emphasized. Remote recording instrumentation, consisting of single or multiaxial accelerometers connected via data cable to a central recorder, will be installed in each building. The accelerometers will be placed on the lowest level, at the roof level, and, in many cases, at one or more intermediate levels. The instrumentation will be situated so as to separately record both translational and torsional response. On the basis of current projected revenues, and instrument procurement, installation and maintenance expenses, it is estimated that as many as 400 buildings may be instrumented under the state program.
Installation; Earthquake resistant structures; California; Earth movements; California Strong Motion Instrumentation Program; Buildings; Earthquake engineering; Ground motion; Recording instruments; Accelerometers