Residual displacement ratio spectrum of structure based on damage in near-fault area

LIU Bali1, HU Jinjun2

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 70-77.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 70-77.

Residual displacement ratio spectrum of structure based on damage in near-fault area

  • LIU Bali1, HU Jinjun2
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Abstract

Residual displacement is an important indicator for structural damage assessment under seismic excitation. In order to reveal the variation law of the damage-based residual displacement in near fault area, the residual displacement ratio spectrum, that is Cr, of single degree of freedom (SDOF) systems was established based on the Park-Ang damage model. The results were statistically organized to evaluate the effect of damage model and hysteretic model on damage-based Cr. The prediction equation was proposed to estimate damage-based Cr of SDOF systems subjected to near-fault pulse-like ground motions by regression analysis. The differences of damage-based Cr subjected to near-fault pulse-like ground motions and damage-based Cr far-field ground motions, and the differences of Cr based on damage approach and Cr ductility approach were compared and analyzed. Results show that the damage-based Cr of stiffness-degrading systems are smaller than those of non-degrading systems. Compared with the damage-based Cr of SDOF systems subjected to far-field ground motions, the damage-based Cr of SDOF systems subjected to near-fault pulse-like ground motions increase by 40%~80% at period of approximately 1.5 s. Ratios of damage-based Cr to ductility-based Cr are greater than 1.1, which indicates that the ductility-based Cr tend to be unconservative compared to the damage-based ones, and that cumulative hysteretic energy consumption has an amplifying effect on Cr of SDOF systems. The prediction equation for damage-based Cr can be applied to residual displacement demand and refined seismic resilience evaluation of structures in near fault area.

Key words

pulse-like ground motion / far-field ground motion / residual displacement / damage index / displacement ductility coefficient

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LIU Bali1, HU Jinjun2. Residual displacement ratio spectrum of structure based on damage in near-fault area[J]. Journal of Vibration and Shock, 2024, 43(13): 70-77

References

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