A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Period elongation of deteriorating structures under mainshock-aftershock sequences
https://orcid.org/0000-0001-6244-3251
Highlights This study investigates the lengthening of the fundamental period of structures subjected to multiple earthquakes. Numerous structural and earthquake parameters are considered in numerical analyses. Constant ductility spectra are developed in terms of the period shift ratio. Reliable equations are proposed to predict the period shift ratio of SDOF systems.
Abstract The elongation of the fundamental period of structure is a typical indicator of structural inelasticity during seismic events and of consequent damage accumulation. This study investigates the lengthening of the fundamental periods of reinforced concrete (RC) structures subjected to mainshock-aftershock sequences. RC structures are schematized herein as nonlinear SDOF (Single Degree Of Freedom) systems with deteriorating properties. Inelastic response spectra are developed considering both ground motion characteristics (e.g. site condition, epicentral distance, PGAs ratio of aftershock to mainshock, and duration) and structural properties, such as ductility, softening, pinching, accumulated damage and unloading stiffness. Furthermore, analytical equations estimating the elongated fundamental period are proposed as a function of the elastic (undamaged) vibration period and the significant structural parameters. The proposed equations can be reliably used for the design of structures against mainshock-aftershock sequences in future generations of seismic design codes.
Period elongation of deteriorating structures under mainshock-aftershock sequences
https://orcid.org/0000-0001-6244-3251
Highlights This study investigates the lengthening of the fundamental period of structures subjected to multiple earthquakes. Numerous structural and earthquake parameters are considered in numerical analyses. Constant ductility spectra are developed in terms of the period shift ratio. Reliable equations are proposed to predict the period shift ratio of SDOF systems.
Abstract The elongation of the fundamental period of structure is a typical indicator of structural inelasticity during seismic events and of consequent damage accumulation. This study investigates the lengthening of the fundamental periods of reinforced concrete (RC) structures subjected to mainshock-aftershock sequences. RC structures are schematized herein as nonlinear SDOF (Single Degree Of Freedom) systems with deteriorating properties. Inelastic response spectra are developed considering both ground motion characteristics (e.g. site condition, epicentral distance, PGAs ratio of aftershock to mainshock, and duration) and structural properties, such as ductility, softening, pinching, accumulated damage and unloading stiffness. Furthermore, analytical equations estimating the elongated fundamental period are proposed as a function of the elastic (undamaged) vibration period and the significant structural parameters. The proposed equations can be reliably used for the design of structures against mainshock-aftershock sequences in future generations of seismic design codes.
Period elongation of deteriorating structures under mainshock-aftershock sequences
https://orcid.org/0000-0001-6244-3251
Highlights This study investigates the lengthening of the fundamental period of structures subjected to multiple earthquakes. Numerous structural and earthquake parameters are considered in numerical analyses. Constant ductility spectra are developed in terms of the period shift ratio. Reliable equations are proposed to predict the period shift ratio of SDOF systems.
Abstract The elongation of the fundamental period of structure is a typical indicator of structural inelasticity during seismic events and of consequent damage accumulation. This study investigates the lengthening of the fundamental periods of reinforced concrete (RC) structures subjected to mainshock-aftershock sequences. RC structures are schematized herein as nonlinear SDOF (Single Degree Of Freedom) systems with deteriorating properties. Inelastic response spectra are developed considering both ground motion characteristics (e.g. site condition, epicentral distance, PGAs ratio of aftershock to mainshock, and duration) and structural properties, such as ductility, softening, pinching, accumulated damage and unloading stiffness. Furthermore, analytical equations estimating the elongated fundamental period are proposed as a function of the elastic (undamaged) vibration period and the significant structural parameters. The proposed equations can be reliably used for the design of structures against mainshock-aftershock sequences in future generations of seismic design codes.
Period elongation of deteriorating structures under mainshock-aftershock sequences
Di Sarno, Luigi (author) / Amiri, Saeed (author)
Engineering Structures ; 196
2019-06-24
Article (Journal)
Electronic Resource
English
Life-cycle seismic resilience of deteriorating highway bridges under mainshock-aftershock sequences
| Springer Verlag | 2025
Residual displacement ratios of structures under mainshock-aftershock sequences
| British Library Online Contents | 2019