Statistical Models for a Proposed Acceleration-Response Modification Factor for Nonstructural Components Attached to Inelastic Structures

Abstract eng:
This paper summarizes ongoing research efforts to quantify a proposed acceleration-response modification factor (Racc) useful to estimate the seismic demands imposed on acceleration-sensitive nonstructural components attached to inelastic multistory structures. The proposed Racc factor can be used similar to response modification factors for primary structures to scale elastic Floor Response Spectra (FRS) to obtain estimates of inelastic FRS. In this context, the terms ‘elastic’ and ‘inelastic’ refer to the primary structure, for only linear elastic components are addressed in this paper. The Racc factor is a function of the location of the component, its damping ratio and period of vibration, as well as the fundamental period of vibration and the level of inelasticity of the primary structure. In some cases, inelasticity in the primary structure amplifies the acceleration demands corresponding to elastic primary structures (Racc < 1), particularly for components located at the bottom floors with periods smaller than half the fundamental period of the primary structure. This amplification of peak component acceleration demands depends strongly on the distribution of inelastic behavior along the height of the structure. However, in most cases, Racc is greater than one, particularly when the period of the component coincides with the modal periods of the primary structure. Statistical models to estimate Racc values are proposed and evaluated in this paper based on inelastic dynamic analyses with multistory structures exposed to 40 ground motions.

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