Dynamic Testing of Nonstructural Components and Equipment: Seismic Qualification and Determination of Functional Performance Limits

Abstract eng:
Dynamic testing of nonstructural components, equipment and systems has been an effective method to satisfy seismic requirements found in model building codes used around the world. Testing is the only viable option when post–event, functional performance expectations are in place (e.g., essential equipment). Unfortunately, seismic qualification practices widely vary in industry, since correlation of the nonstructural lateral force requirements to parameters compatible with dynamic testing is not explicitly defined in code provisions. This paper presents key implementation issues necessary for conducting qualification testing in alignment with code intent as defined by code writing authorities responsible for developing the model building codes used in the United States. In addition, this paper expands on the idea that current-state qualification practice is not compatible with the desired-state goal of implementing performance-based seismic design (PBSD) approaches. PBSD is envisioned as the next-generation performance-based engineering procedures, where performance is expressed as the probable consequences of earthquake damage. A new approach to performance assessment for nonstructural components and systems will be required in which lower-level equipment subassemblies and components can be assessed independently and combined with other components to arrive at a top-level system fragility index. Composite fragility approaches will require industry acceptance prior to incorporation in the next generation building codes that adopt PBSD.

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