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Inelastic floor spectra for designing anchored acceleration-sensitive nonstructural components

Anajafi, Hamidreza ; Medina, Ricardo A. ; Santini-Bell, Erin

Bulletin of earthquake engineering, 2020-03, Vol.18 (5), p.2115-2147 [Periódico revisado por pares]

Dordrecht: Springer Netherlands

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Título:
Inelastic floor spectra for designing anchored acceleration-sensitive nonstructural components
Autor: Anajafi, Hamidreza ; Medina, Ricardo A. ; Santini-Bell, Erin
Assuntos: Acceleration ; Amino acid sequence ; Building codes ; Buildings ; Civil Engineering ; Components ; Construction ; Damping ; Damping ratio ; Displacement ; Ductility ; Earth and Environmental Science ; Earth Sciences ; Earthquakes ; Elasticity ; Environmental Engineering/Biotechnology ; Flexibility ; Floors ; Geophysics/Geodesy ; Geotechnical Engineering & Applied Earth Sciences ; Ground motion ; Hydrogeology ; Original Research ; Parameter estimation ; Parameter modification ; Parameter sensitivity ; Seismic engineering ; Spectra ; Structural Geology ; Tuning ; Viscous damping
É parte de: Bulletin of earthquake engineering, 2020-03, Vol.18 (5), p.2115-2147
Descrição: In this study, inelastic floor spectra are developed for designing acceleration-sensitive nonstructural components (NSCs). The parameters response modification (reduction) factor, R cc , and inelastic displacement ratio, C cc , are evaluated to quantify the effects of NSCs inelasticity on their seismic-induced force and displacement demands, respectively. The results of the conducted response history analyses illustrate that the inelastic behavior of NSCs can significantly de-emphasize the effects of their tuning period ratio and viscous damping ratio, and of the characteristics of the primary structure and ground excitation. Due to the quasi-harmonic characteristic of building floor motions, NSC inelasticity is more effective for NSCs attached to buildings than for those attached to the ground. NSC inelasticity is most effective for a low - damping roof - mounted NSC tuned to the first modal period of an elastic building (i.e., the most critical NSC from the design point of view). Adopting even a mild level of inelasticity for tuned NSCs not only decreases their seismic force demands significantly but also reduces their displacement demands. For non-tuning conditions, particularly for rigid NSCs, achieving even a relatively small R cc (i.e., a small reduction in force demand) leads to a significant increase in NSC displacement and ductility demands suggesting that these NSCs should be designed to remain elastic. Results illustrate that the amplitude of R cc and C cc depends on the tuning ratio, viscous damping, and level of inelasticity of NSCs, and to a lesser extent, on the characteristics of the primary structure and ground motion. Simplified yet reliable equations are proposed for the estimation of the parameter R cc for non-rigid NSCs with different levels of inelasticity and viscous damping.
Editor: Dordrecht: Springer Netherlands
Idioma: Inglês

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Inelastic floor spectra for designing anchored acceleration-sensitive nonstructural components

Anajafi, Hamidreza ; Medina, Ricardo A. ; Santini-Bell, Erin

Dordrecht: Springer Netherlands

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