An Improved Method of Matching Response Spectra of Recorded Earthquake Ground Motion Using Wavelets

Hancock, Jonathan; Watson-Lamprey, Jennie; Abrahamson, Norman A.; Bommer, Julian J.; Markatis, Alexandros; McCoy, Emma J.; Mendis, Rishmila

doi:10.1080/13632460609350629

Cited by 415 publications

(246 citation statements)

References 12 publications

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“…SeismoMatch is capable of adjusting earthquake accelerograms to match a specific target response spectrum using wavelets algorithm, which preserves the high-frequency characteristics of the input ground motion that are important for engineering projects [33]. Figure 1 (b) shows the good agreement between the response spectra of the 21 adjusted ground motions with the target elastic design response spectrum of IBC-2012.…”

Section: Modelling Of Superstructures and Selected Ground Motionsmentioning

confidence: 66%

Optimum lateral load distribution for seismic design of nonlinear shear-buildings considering soil-structure interaction

Ganjavi

Hajirasouliha

Bolourchi

2016

Soil Dynamics and Earthquake Engineering

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The lateral load distributions specified by seismic design provisions are primarily based on elastic behaviour of fixed-base structures without considering the effects of soil-structure-interaction (SSI).Consequently, such load patterns may not be suitable for seismic design of non-linear flexible-base structures. In this paper, a practical optimization technique is introduced to obtain optimum seismic design loads for non-linear shear-buildings on soft soils based on the concept of uniform damage distribution. SSI effects are taken into account by using the cone model. Over 30,000 optimum load patterns are obtained for 21 earthquake excitations recorded on soft soils to investigate the effects of fundamental period of the structure, number of stories, ductility demand, earthquake excitation, damping ratio, damping model, structural post yield behaviour, soil flexibility and structural aspect ratio on the optimum load patterns.The results indicate that the proposed optimum load patterns can significantly improve the seismic performance of flexible-base buildings on soft soils.

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Section: Modelling Of Superstructures and Selected Ground Motionsmentioning

confidence: 66%

Optimum lateral load distribution for seismic design of nonlinear shear-buildings considering soil-structure interaction

Ganjavi

Hajirasouliha

Bolourchi

2016

Soil Dynamics and Earthquake Engineering

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“…The fatigue and absorbed hysteretic energy damage measures are known to be dependent on ground-motion duration (e.g., Hancock and Bommer 2006). The lack of bias in these damage measures demonstrates that selecting records to match the earthquake magnitude is sufficient to prevent scale bias from different ground-motion durations.…”

Section: Scale Factor Biasmentioning

confidence: 99%

Numbers of scaled and matched accelerograms required for inelastic dynamic analyses

Hancock

Bommer

Stafford

2008

Earthq Engng Struct Dyn

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186

132

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SUMMARYSelecting, scaling and matching accelerograms is critically important to engineering design and assessment, enabling structural response to be determined with greater confidence and through fewer analyses than if unscaled accelerograms are employed. This paper considers the response of an 8-storey MDOF reinforced concrete structure to accelerograms selected, linearly scaled or spectrally matched using five different techniques. The first method consists of selecting real records on the basis seismological characteristics, while the remaining methods make an initial selection on the basis of magnitude and spectral shape before: (1) scaling to the target spectral acceleration at the initial period; (2) scaling to match the target spectrum over a range of periods; (3) using wavelet adjustments to match the target spectrum; and (4) using wavelet adjustments to match multiple target spectra for different damping ratios. The analyses indicate that the number of records required to obtain a stable estimate of the response decreases drastically as one moves through these methods. The exact number varies among damage measures and is shown to be related to the predictability of the response measure that is considered. For measures such as peak roof and inter-storey drift, member end-rotation and Park and Ang damage, as few as one or two records are required to estimate the response to within ±5% (for a 64% confidence level) if matching to multiple damping ratios is conducted. Bias checks are made using predictive equations of the expected response derived from the results of 1656 non-linear time-domain analyses of the structure under the action of unscaled accelerograms.

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“…Based on research presented in papers [25,26], where it is emphasised that seismic records with higher peak ground velocities (PGV) are more relevant than those with higher peak ground acceleration (PGA) for seismic analysis of reinforced concrete arch bridges, the authors selected the following seismic records for this Seismic assessment of existing reinforced-concrete arch bridges with the response spectra matching using the wavelets algorithm. [27,28]. It can be seen from Figure 5 that the envelope of internal forces (CQC envelope) obtained based on the first assessment step from two different linear multimodal spectral analyses, the first one with the effective stiffness of columns according to EN 1998-2, equation (2), (CQC_EC8), and the second one with the effective stiffness of columns according to expressions (3) to (6), (CQC_eff), as originally suggested by the authors, generally corresponds well with the results of the time history analysis.…”

Section: Verification By Time History Analysismentioning

confidence: 99%

Seismic assessment of existing reinforced concrete arch bridges

2014

JCE

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A new seismic assessment procedure for arch bridges is presented in the paper. The linear response spectrum analysis and the nonlinear static pushover methods are combined in this procedure through various assessment levels and appropriate checks. Guidelines for collecting arch-bridge data needed to reach the required level of knowledge on structural properties are proposed. Criteria for seismic assessment, such as the required participation of effective modal masses, adequate stiffness distribution of spandrel columns, and determination of reference point for forming capacity curves, are improved and adjusted for arch bridges. Seizmičko ocjenjivanje postojećih armiranobetonskih lučnih mostovaU ovome je radu prikazana nova metoda seizmičkog ocjenjivanja lučnih mostova. Linearni proračun metodom spektralne analize i nelinearne statičke metode postupnog guranja kombiniraju se u ovoj proceduri kroz razine ocjenjivanja i pripadne provjere. Predlažu se smjernice za prikupljanje podataka o lučnim mostovima s ciljem ostvarivanja tražene razine poznavanja konstrukcije. Pritom su kriteriji za seizmičku ocjenu, primjerice zahtijevano sudjelovanje djelotvorne modalne mase, prikladna raspodjela krutosti nadlučnih stupova i utvrđivanje poredbene točke za formiranje krivulja kapaciteta, ovom metodom poboljšani i prilagođeni lučnim mostovima. Seismische Begutachtung bestehender Bogenbrücken aus StahlbetonIn dieser Arbeit wird eine neue Methode der seismischen Begutachtung von Bogenbrücken dargestellt. Dabei werden lineare Antwortspektrum-Analysen und nichtlineare statische Pushover-Methoden durch Bewertungsstufen und entsprechende Nachweise kombiniert. Ebenso werden Richtlinien für die Zusammenstellung von Datenbanken gegeben, die das Erzielen der angestrebten Kenntnisstufe ermöglichen. Kriterien für die seismische Begutachtung, wie beispielsweise die erforderliche Teilnahme der effektiven modalen Masse, die angemessene Steifigkeitsverteilung der Brückenstützen und die Berechnung des Leistungspunktes bei der Ermittlung der Kapazitätskurve sind durch diesen Vorgang verbessert und der Bewertung von Bogenbrücken angepasst worden. Schlüsselwörter:Bogenbrücken, Seismische Begutachtung, lineare Antwortspektrum-Analyse, nichtlineare statische Pushover-Methode

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An Improved Method of Matching Response Spectra of Recorded Earthquake Ground Motion Using Wavelets

Cited by 415 publications

References 12 publications

Optimum lateral load distribution for seismic design of nonlinear shear-buildings considering soil-structure interaction

Optimum lateral load distribution for seismic design of nonlinear shear-buildings considering soil-structure interaction

Numbers of scaled and matched accelerograms required for inelastic dynamic analyses

Seismic assessment of existing reinforced concrete arch bridges

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