Ground Motion Record Selection Based on Broadband Spectral Compatibility

2014 ◽  
Vol 30 (4) ◽  
pp. 1427-1448 ◽  
Author(s):  
Chiara Smerzini ◽  
Carmine Galasso ◽  
Iunio Iervolino ◽  
Roberto Paolucci
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Time History ◽  
Strong Motion ◽  
Software Tool ◽  
Engineering Practice ◽  
Ongoing Research ◽  
Research Activities ◽  
Record Selection ◽  
Ground Motion Record Selection

The increasing interest in performance-based earthquake engineering has promoted research on the improvement of hazard-consistent seismic input definition and on advanced criteria for strong motion record selection to perform nonlinear time history analyses. Within the ongoing research activities to improve the representation of seismic actions and to develop tools as a support for engineering practice, this study addresses the selection of displacement-spectrum-compatible real ground motions, with special reference to Italy. This involved (1) the definition of specific target displacement spectra for Italian sites, constrained—both at long and short periods—by results of probabilistic seismic hazard analyses; (2) the compilation of a high-quality strong ground motion database; and (3) the development of a software tool for computer-aided displacement-based record selection. Application examples show that sets of unscaled, or lightly scaled, accelerograms with limited record-to-record spectral variability can also easily be obtained when a broadband spectral compatibility is required.

scholarly journals Ground Motion Record Selection using Multi-objective Optimization Algorithms: A Comparative Study

2019 ◽  
Author(s):  
Ali Kaveh ◽  
Roya Mahdipou Moghanni ◽  
Seyed Mohammad Javadi
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Optimization Algorithms ◽  
Time History ◽  
Multi Objective Optimization ◽  
Nsga Ii ◽  
Site Specific ◽  
Multi Objective ◽  
Record Selection ◽  
Ground Motion Record Selection

Performing time history dynamic analysis using site-specific ground motion records according to the increasing interest in the performance-based earthquake engineering has encouraged studies related to site-specific Ground Motion Record (GMR) selection methods. This study addresses a ground motion record selection approach based on three different multi-objective optimization algorithms including Multi-Objective Particle Swarm Optimization (MOPSO), Non-dominated Sorting Genetic Algorithm II (NSGA-II) and Pareto Envelope-based Selection Algorithm II (PESA-II). The method proposed in this paper selects records efficiently by matching dispersion and mean spectrum of the selected record set and target spectrums in a predefined period. Comparison between the results shows that NSGA II performs better than the other algorithms in the case of GMR selection.

Design Ground Motion Library: An Interactive Tool for Selecting Earthquake Ground Motions

2015 ◽  
Vol 31 (2) ◽  
pp. 617-635 ◽  
Author(s):  
Gang Wang ◽  
Robert Youngs ◽  
Maurice Power ◽  
Zhihua Li
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Response Spectrum ◽  
Time History ◽  
Earthquake Ground Motion ◽  
Engineering Practice ◽  
Period Range ◽  
Engineering Research ◽  
Interactive Tool ◽  
Design Response Spectrum

The Design Ground Motion Library (DGML) is an interactive tool for selecting earthquake ground motion time histories based on contemporary knowledge and engineering practice. It was created from a ground motion database that consists of 3,182 records from shallow crustal earthquakes in active tectonic regions rotated to fault-normal and fault-parallel directions. The DGML enables users to construct design response spectra based on Next-Generation Attenuation (NGA) relationships, including conditional mean spectra, code spectra, and user-specified spectra. It has the broad capability of searching for time history record sets in the database on the basis of the similarity of a record's response spectral shape to a design response spectrum over a user-defined period range. Selection criteria considering other ground motion characteristics and user needs are also provided. The DGML has been adapted for online application by the Pacific Earthquake Engineering Research Center (PEER) and incorporated as a beta version on the PEER database website.

Engineering observations on ground motion at the Van Norman Complex after the 1994 Northridge earthquake

1996 ◽  
Vol 86 (1B) ◽  
pp. S333-S349 ◽  
Author(s):  
J. P. Bardet ◽  
C. Davis
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Low Frequency ◽  
Strong Motion ◽  
Response Spectra ◽  
Vertical Acceleration ◽  
Northridge Earthquake ◽  
Peak Acceleration ◽  
Geotechnical Earthquake Engineering ◽  
1994 Northridge Earthquake

Abstract During the 1994 Northridge earthquake, the Van Norman Complex yielded an unprecedented number of recordings with high acceleration, in the close proximity of the fault rupture. These strong-motion recordings exhibited the pulses of the main event. One station recorded the largest velocity ever instrumentally recorded (177 cm/sec), resulting from a 0.86 g peak acceleration with a low frequency. Throughout the complex, the horizontal accelerations reached peak values ranging from 0.56 to 1.0 g, except for the complex center, where the peak acceleration did not exceed 0.43 g. The vertical acceleration reached maximum peak values comparable with those of the horizontal acceleration. The acceleration response spectra in the longitudinal and transverse directions were significantly different. Such a difference, which is not yet well documented in the field of geotechnical earthquake engineering, indicates that the amplitude and frequency content of the ground motion was directionally dependent in the Van Norman Complex.

Efficient Intensity Measures for Probabilistic Seismic Response Analysis of Anchored Above-Ground Liquid Steel Storage Tanks

2016 ◽  
Author(s):  
Hoang Nam Phan ◽  
Fabrizio Paolacci
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Nuclear Power ◽  
Power Plants ◽  
Seismic Analysis ◽  
Time History ◽  
Response Analysis ◽  
Storage Tanks ◽  
Intensity Measures ◽  
Study Results

Liquid storage tanks are vital lifeline structures and have been widely used in industries and nuclear power plants. In performance-based earthquake engineering, the assessment of probabilistic seismic risk of structural components at a site is significantly affected by the choice of ground motion intensity measures (IMs). However, at present there is no specific widely accepted procedure to evaluate the efficiency of IMs used in assessing the seismic performance of steel storage tanks. The study presented herein concerns the probabilistic seismic analysis of anchored above-ground steel storage tanks subjected to several sets of ground motion records. The engineering demand parameters for the analysis are the compressive meridional stress in the tank wall and the sloshing wave height of the liquid free surface. The efficiency and sufficiency of each alternative IM are quantified by results of time history analyses for the structural response and a proper regression analysis. According to the comparative study results, this paper proposes the most efficient and sufficient IMs with respect to the above demand parameters for a portfolio of anchored steel storage tanks.

Conditional spectrum-based ground motion record selection using average spectral acceleration

2017 ◽  
Vol 46 (10) ◽  
pp. 1667-1685 ◽  
Author(s):  
Mohsen Kohrangi ◽  
Paolo Bazzurro ◽  
Dimitrios Vamvatsikos ◽  
Andrea Spillatura
Keyword(s):  
Ground Motion ◽  
Spectral Acceleration ◽  
Record Selection ◽  
Ground Motion Record Selection

scholarly journals Site-Specific Response Spectra: Guidelines for Engineering Practice

CivilEng ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 712-735
Author(s):  
Yiwei Hu ◽  
Nelson Lam ◽  
Prashidha Khatiwada ◽  
Scott Joseph Menegon ◽  
Daniel T. W. Looi
Keyword(s):  
Ground Motion ◽  
Response Spectrum ◽  
Time History ◽  
Response Spectra ◽  
Engineering Practice ◽  
Site Classification ◽  
Specific Response ◽  
Potential Cost ◽  
Site Specific ◽  
Real Behavior

Code response spectrum models, which are used widely in the earthquake-resistant design of buildings, are simple to apply but they do not necessarily represent the real behavior of an earthquake. A code response spectrum model typically incorporates ground motion behavior in a diversity of earthquake scenarios affecting the site and does not represent any specific earthquake scenario. The soil amplification phenomenon is also poorly represented, as the current site classification scheme contains little information over the potential dynamic response behavior of the soil sediments. Site-specific response spectra have the merit of much more accurately representing real behavior. The improvement in accuracy can be translated into significant potential cost savings. Despite all the potential merits of adopting site-specific response spectra, few design engineers make use of these code provisions that have been around for a long time. This lack of uptake of the procedure by structural designers is related to the absence of a coherent set of detailed guidelines to facilitate practical applications. To fill in this knowledge gap, this paper aims at explaining the procedure in detail for generating site-specific response spectra for the seismic design or assessment of buildings. Surface ground motion accelerograms generated from the procedure can also be employed for nonlinear time-history analyses where necessary. A case study is presented to illustrate the procedure in a step-by-step manner.

Ground-Motion Models for the Prediction of Significant Duration Using Strong-Motion Data from Iran

2020 ◽  
Vol 110 (1) ◽  
pp. 319-330 ◽  
Author(s):  
Ali Meimandi-Parizi ◽  
Masoud Daryoushi ◽  
Abbas Mahdavian ◽  
Hamid Saffari
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Functional Form ◽  
Prediction Models ◽  
Strong Motion ◽  
Engineering Research ◽  
Significant Duration ◽  
Rate Of Increase ◽  
Peer Models ◽  
Rupture Distance

ABSTRACT In this study, new prediction equations for significant duration (DS5–75 and DS5–95) are developed using an Iranian strong ground-motion database. The database includes 2228 records of 749 earthquakes with small to large magnitudes up to the year 2018. The functional form of the model is an additive natural logarithm of four predictor variables, namely moment magnitude (Mw), rupture distance (Rrup), time-averaged shear-wave velocity in the top 30 m (VS30), and the style of faulting effect (Fm), which is considered as an indicator directly in the functional form for the first time. The proposed models can be used to estimate significant durations of earthquakes with moment magnitudes (Mw) from 4.5 to 7.6 and rupture distances of up to 200 km. The models are compared with four existing significant-duration prediction models. The results indicate proper agreement between the proposed models and the models that use the Pacific Earthquake Engineering Research Center-Next Generation Attenuation-West2 Project (PEER-NGA West2) database (say PEER models). Based on the results, our proposed models indicate an increasing trend of significant duration with an increase in the rupture distance. However, unlike the PEER models, the rate of increase in significant duration is decreasing in our model.

NGA Project Strong-Motion Database

2008 ◽  
Vol 24 (1) ◽  
pp. 23-44 ◽  
Author(s):  
Brian Chiou ◽  
Robert Darragh ◽  
Nick Gregor ◽  
Walter Silva
Keyword(s):  
Time Series ◽  
Ground Motion ◽  
Model Development ◽  
Strong Motion ◽  
Corner Frequency ◽  
Engineering Practice ◽  
Data Set ◽  
Acceleration Time ◽  
Crustal Earthquakes ◽  
Strong Motion Database

A key component of the NGA research project was the development of a strong-motion database with improved quality and content that could be used for ground-motion research as well as for engineering practice. Development of the NGA database was executed through the Lifelines program of the PEER Center with contributions from several research organizations and many individuals in the engineering and seismological communities. Currently, the data set consists of 3551 publicly available multi-component records from 173 shallow crustal earthquakes, ranging in magnitude from 4.2 to 7.9. Each acceleration time series has been corrected and filtered, and pseudo absolute spectral acceleration at multiple damping levels has been computed for each of the 3 components of the acceleration time series. The lowest limit of usable spectral frequency was determined based on the type of filter and the filter corner frequency. For NGA model development, the two horizontal acceleration components were further rotated to form the orientation-independent measure of horizontal ground motion (GMRotI50). In addition to the ground-motion parameters, a large and comprehensive list of metadata characterizing the recording conditions of each record was also developed. NGA data have been systematically checked and reviewed by experts and NGA developers.

Analytical solution for ground motion of a half space with a semi-cylindrical canyon and a beeline crack

2008 ◽  
Vol 464 (2095) ◽  
pp. 1905-1921 ◽  
Author(s):  
Gang Liu ◽  
Baohua Ji ◽  
Diankui Liu
Keyword(s):  
Analytical Solution ◽  
Half Space ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Ground Surface ◽  
Strong Motion ◽  
Complex Functions ◽  
Novel Method ◽  
Irregular Topography ◽  
Analytical Expressions

In earthquake engineering and strong motion seismology, an important issue is to describe and analyse the displacement amplitudes and the relative phases of motions of infrastructures on or nearby the ground surface. In this paper, the influence of a beeline crack on the ground motion of a half space with a semi-cylindrical canyon under anti-plane loading is studied. A novel method combining Green's function and complex functions that can consider very irregular topography is developed for deriving the function of ground motion of the half space. Analytical expressions for the displacement and stress in the half space are obtained. Our results show that the positions and dimensions of the canyon and the beeline crack have a big influence on the ground motion. The crack can amplify the amplitudes of the motion significantly, and its influence cannot be neglected until the distance between the crack and the ground reaches up to 100 times more than the dimension of the crack.

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