On the Use of Design Spectrum Compatible Time Histories

Naeim, Farzad; Lew, Marshall

doi:10.1193/1.1585805

Cited by 123 publications

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“…Furthermore, noticeable difference in the mean of the maximum responses and little difference in variance is found between the artificial ensembles. The strong uniformity observed in the responses to ensemble SIMQKE, which comprises accelerograms fitted to the Code's response spectrum, confirms earlier studies [3,8]. Additionally, ensemble SIMQKE resulted in higher mean displacements of the control nodes.…”

Section: Discussionsupporting

confidence: 86%

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The Effect of Seismic Loading Simulation on the Response Variability of Structures

Vagionas¹,

Stefanou²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This paper investigates the variability of the seismic response of structures subjected to various ensembles of ground motions in the framework of nonlinear dynamic analysis. In this kind of analysis, seismic loading, introduced in the form of excitation accelerograms, constitutes the most important source of uncertainty, as it depends on a number of random factors (e.g. distance from the fault source, magnitude, local soil conditions). In order to quantify the effect of seismic loading simulation on the response variability of structures, nonlinear dynamic analysis is carried out on a steel frame, subjected successively to three ground motion ensembles. The ensembles comprise, respectively, real ground motions and artificial accelerograms generated by two different algorithms, one in accordance with the Code provisions and one targeted to a more realistic simulation of the seismic event. Comparison of the three approaches is made by monitoring the statistical properties of the maximum displacement and interstorey drift induced by the assumed ensembles.

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Section: Discussionsupporting

confidence: 86%

“…However, the practice has been criticized over conservative, unrealistic estimations, as well as loss of the inherent response variability under recorded motions [3]. The main issue with spectrum compatible accelerograms lies with the nature of the Codes' smoothed response spectrum.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Seismic Loading Simulation on the Response Variability of Structures

Vagionas¹,

Stefanou²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…However, when spectral compatible motions are used, all periods are subjected to the full design seismic action. Naeim and Lew [12] on the basis of nonlinear analysis of structures have expressed the view that these spectrum compatible motions should not be used for damage assessment because they give exaggerated estimates of displacement demand and energy input. For this reason, designers should be cautious about using spectrum compatible motions when estimating the displacements of embankment dams and earth structures under strong shaking, if the acceptable performance of these structures is speci®ed by criteria based on tolerable displacements.…”

Section: Selection Of Design Ground Motionsmentioning

confidence: 99%

State-of-the-art of geotechnical earthquake engineering practice

Finn

2000

Soil Dynamics and Earthquake Engineering

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Major developments in geotechnical earthquake engineering practice over the last 15 years are reviewed. The objectives of the review are to present a coherent view of the current state of practice at the highest level and to examine trends, which may shape practice in the future. Developments are described in the following areas: speci®cation of design ground motions, dynamic response analysis, evaluation of liquefaction potential, evaluation of residual strength of lique®ed soil, post-liquefaction displacement analysis, and seismic risk analysis. q

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“…However, the well-known Uniform Hazard Spectrum (UHS) is unappealing for this application, as it is an envelope of spectral values associated with multiple ground motions, rather than a description of a single ground motion. Problems with treating the UHS as the spectrum of a single ground motion have been also noted by some other researchers [16][17][18].…”

Section: Proposed Approach Of Record Selection (Step-by Step)mentioning

confidence: 99%

Ground Motion Selection and Scaling in Practice

Najafi

Tehranizadeh

2015

Period. Polytech. Civil Eng.

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IntroductionSeismic provisions in current building codes and standards include rules for design of structures using nonlinear response history analysis in some conditions. Due to the lack of recorded data for the design level earthquakes (which are usually rare events), it is critical to develop systematic methods and useful tools to select and modify from current ground motion databases to provide a group of earthquake motions that can realistically represent important aspects of the design motion controlling the nonlinear response of civil engineering facilities [1]. The best method for selecting and scaling ground motions will depend on the type of assessment being performed. ATC-58-1 identifies three types of performance assessment: intensity, scenario, and time-based. Intensity-based assessments are the most common of the three types and compute the response of a building and its components for a specified intensity of ground shaking (this approach is the focus of this paper). A scenario-based assessment computes the response of a building to a user specified earthquake event, which is typically defined by earthquake magnitude and the distance between the earthquake source and the building site. A risk-based (referred to as time-based assessment in ATC-58-1) assessment provides information on response over a period of time (e.g., annual rates). This is the most comprehensive type of assessment and involves a number of intensity-based assessments over the range of ground motion levels of interest [2]. Despite the scenario-based assessment which computes the response of a building based on a specific earthquake event, intensity and time-based assessments have been conducted subjecting to a group of records. Time-based assessment acquires information of all occurred earthquakes which have been utilized to adjust hazard curve of the assessed region; so, as much as records could be provided, the confidence level will promote, so many researchers attempts to enlarge records category to reduce record-by-record variations incorporated in this type of assessment. However, intensity-based assessment deal with number of records represented by intensity measures (IM), like peak ground acceleration, spectral acceleration on fundamental period of the model or etc., which are scaled associated to the intensity assumed target spectrum. Therefore, although enlarge-

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On the Use of Design Spectrum Compatible Time Histories

Cited by 123 publications

References 0 publications

The Effect of Seismic Loading Simulation on the Response Variability of Structures

The Effect of Seismic Loading Simulation on the Response Variability of Structures

State-of-the-art of geotechnical earthquake engineering practice

Ground Motion Selection and Scaling in Practice

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