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| Titel: |
Effective Cyclic Energy as a Measure of Seismic Demand |
| Auteur: |
Kalkan, Erol Kunnath, Sashi K. |
| Verschenen in: |
Journal of earthquake engineering |
| Paginering: | Jaargang 11 (2007) nr. 5 pagina's 725-751 |
| Jaar: |
2007-09 |
| Inhoud: |
Structural damage during strong ground shaking is associated with both the seismic input energy and the ability of structural components to dissipate energy through viscous damping and inelastic cyclic response. The correlation of the damage potential of ground motions with seismic energy demand is an important element in developing energy-based design methodologies. This article proposes a new measure of the severity of ground motions by introducing the concept of effective cyclic energy (ECE) defined as the peak-to-peak energy demand (sum of hysteretic and damping energies) imposed on a structure over an effective duration that is equivalent to the time between two zero-crossings of the “effective velocity pulse.” The proposed energy measure, which is dependent on the characteristics of the ground motion, is shown to be well correlated with peak seismic demand for a range of system parameters. The development of ECE also provides a basis for defining a non dimensional response index (γeff) to quantify the destructive potential of ground motions. The effectiveness of the new index parameter is validated using an extensive set of near-fault accelerograms and also compared to other ground motion severity indices. Finally, ECE demand of a MDOF system is estimated through modal-energy-decomposition of elastic and inelastic SDOF systems, and the concept of ECE spectrum is proposed to estimate the modal target energy demands for performance evaluation of structures. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 8 gevonden artikelen
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