Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

An equivalent acceleration signal can be regarded as an acceleration time history, inferred from a reference acceleration record which can be defined in different ways on the basis of different equivalence criteria such as: 1) kinematic characteristics of the signal; 2) Fourier spectrum amplitude; 3) Fourier spectrum phase values; 4) response spectrum; 5) energy. The equivalent signals may be employed in technical-scientific applications, when common theoretical approaches or instrumental devices can hardly manage the whole complexity of the actual phenomena to be investigated. As their definition suggests, equivalent signals are full-fledged analogue tools for modelling natural processes (real prototypes) as physical analogues (equivalent prototypes). At this regard, the levelled-energy multifrequencial analysis for deriving dynamic equivalent signals (LEMA_DES) optimises the already existing ones, by obtaining acceleration signals that can be regarded as more constrained to the real actions. Following this approach, a dynamic equivalent signal is derived by selecting and processing a limited number of representative harmonic functions from the reference acceleration spectrum. The dynamic equivalent signal is sized on a reference prototype under criteria of energy, spectral and peak acceleration (PGA) equivalence. The LEMA_DES approach was tested on 48 acceleration records from 23 November, 1980 Irpinia earthquake and compared with more traditional approaches for deriving cyclic equivalent inputs. Moreover, a specifically derived LEMA_DES signal was applied to force a slope by a FDM numerical modelling, referred to the Calitri landslide case-history which was seismically-induced by the same considered earthquake.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

The Levelled-Energy Multifrequencial Analysis for Deriving Dynamic Equivalent Signals (Lema_Des): Application for an Earthquake Scenario

San Diego, California

An equivalent acceleration signal can be regarded as an acceleration time history, inferred from a reference acceleration record which can be defined in different ways on the basis of different equivalence criteria such as: 1) kinematic characteristics of the signal; 2) Fourier spectrum amplitude; 3) Fourier spectrum phase values; 4) response spectrum; 5) energy. The equivalent signals may be employed in technical-scientific applications, when common theoretical approaches or instrumental devices can hardly manage the whole complexity of the actual phenomena to be investigated. As their definition suggests, equivalent signals are full-fledged analogue tools for modelling natural processes (real prototypes) as physical analogues (equivalent prototypes). At this regard, the levelled-energy multifrequencial analysis for deriving dynamic equivalent signals (LEMA_DES) optimises the already existing ones, by obtaining acceleration signals that can be regarded as more constrained to the real actions. Following this approach, a dynamic equivalent signal is derived by selecting and processing a limited number of representative harmonic functions from the reference acceleration spectrum. The dynamic equivalent signal is sized on a reference prototype under criteria of energy, spectral and peak acceleration (PGA) equivalence. The LEMA_DES approach was tested on 48 acceleration records from 23 November, 1980 Irpinia earthquake and compared with more traditional approaches for deriving cyclic equivalent inputs. Moreover, a specifically derived LEMA_DES signal was applied to force a slope by a FDM numerical modelling, referred to the Calitri landslide case-history which was seismically-induced by the same considered earthquake.