FRM - I+D+i - Informe de Investigación

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12272/14099

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Author: search.filters.author.Frau, CarlosHas files: Yes

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    : Influence of the Structural Period in the Input Energy Power
    (Universidad Tecnológica Nacional. Faculatd Regional Mendoza, 2025-01-01) Frau, Carlos; Panella, Sebastián; Gioacchini, Gustavo
    Performance-Based Seismic Engineering requires the evaluation of AQ1 ground motion intensity measures. This is also necessary for Energy-Based Design methodology which effect of ground motions on structures is considered as an energy input to structures. It is known that intensity measures of ground motion based on energy allow an improved characterization of different types of time histories. This is because energy is a cumulative measure of ground shaking and it captures the duration effects, frequency content and amplitude. In particular, the time that the ground motions deliver the energy is a relevant aspect that differs from the traditional acceleration response spectra which represents only the maximum response. To take in count the time in which the energy enters in the structure, and should be dissipated, previous works have introduced the power concept; it is defined as the total input energy divided by the time energy takes to enter to the structure. In the definition of the time to calculate the power the effective duration of the acceleration time history was used as the time interval between the 5% and 95% of the Arias Intensity. In this work the time interval in which the energy enter to the structure is studied. The time to calculate the power is obtained from the graph of input energy for each structural period. Thus, the parameters named as Input Energy Power, Input Energy Power Spectrum and Input Energy Power Intensity are redefined from this new definition of time. It was found that the time which the energy enters to the structure changes significative from a period to another, especially in near-fault record. When this time is compared with the structural period it is observed that in some cases the structures should dissipate a great amount of energy in a few strain cycles.
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    Input energy power for near- fault and far - fault ground motions
    (Universidad Tecnológica Nacional. Faculatd Regional Mendoza, 2024-06-30) Frau, Carlos; Panella, Sebastián; Tornello, Miguel
    In energy based seismic design (EBSD) approach, effect of ground motions on structures is considered as an energy input to structures (EI). The usage of energy spectra is an effective tool in energy based seismic design (EBSD) methods, such as the use of design acceleration spectra in force-based and displacement-based methods. The obtaining of input energy spectra offers an important advantage to determine the energy input to structures with the effect of ground motions. On the other side, near-fault seismic ground motions are frequently characterised by intense velocity and displacement pulses of relatively long periods that clearly distinguish them from typical far-field ground motions. Intense velocity pulse motions can adversely affect the seismic performance of structures. Based on new parameters previously defined called “Input Energy Power” (IEP) and “Energy Spectral Intensity” (ESI) a comparison between ground motions pulse-like and vibratory-like is established. Is seen that records near-fault reach higher Input Energy Spectrum (IES) than far-fault records but when they are compared by the IEP or ESI the differences are much greater.