Probabilistic seismic demand analysis of reinforced concrete frames based on inelastic spectra displacement#br#

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 162-171.

XU Chao,GENG Fei,WEN Zengping

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Abstract

Ground motion intensity measurement is an important factor affecting the input ground motions selection and the reliability of probabilistic seismic demand analysis results.Peak ground acceleration and acceleration spectrum values corresponding to the fundamental period of a structure are commonly used measures of ground motion intensity.But using peak ground acceleration leads to a large dispersion of structural responses, and an acceleration spectrum value corresponding to a structure’s fundamental period cannot reflect the impact of multiple ground motion frequency components on structural response.In this study, inelastic spectral displacement was used as an alternative intensity measurement to characterize the ground motion damage potential, and inelastic spectral displacement-based probabilistic seismic demand analysis was performed.The inelastic spectral displacement calculation method was presented based on modal pushover analysis.Probability seismic demand analyses of typical RC frames were performed by means of cloud analysis and advanced incremental dynamic analysis.The sufficiency and efficiency of inelastic spectral displacement were investigated by means of regression and residual analyses and compared with elastic spectral displacement.The study shows that inelastic spectral displacement characterizes the impact of frequency components with periods larger than the fundamental period on inelastic structural response, improving the deficiency of elastic spectra displacement.The damage potential of ground motion on structures with fundamental period prolonging caused by structural softening can be caught by inelastic spectral displacement.

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XU Chao,GENG Fei,WEN Zengping. Probabilistic seismic demand analysis of reinforced concrete frames based on inelastic spectra displacement#br#[J]. Journal of Vibration and Shock, 2018, 37(16): 162-171

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