A ground motion selection and modification method capturing response spectrum characteristics and variability of scenario earthquakes

Abstract Earthquake ground motion variability is one of the primary sources of uncertainty in the assessment of the seismic performance of civil systems. The paper presents a novel method to select and modify ground motions to achieve specified response spectrum variability. The resulted ground motions capture the median, standard deviation and correlations of response spectra of an earthquake scenario conditioned on a specified earthquake magnitude, source-to-site distance, fault mechanism, site condition, etc. The proposed method was evaluated through numerical analyses of a 20-story RC frame structure. The example demonstrated the excellent capacity of the proposed method in capturing the full distribution of nonlinear structural responses under a specified scenario. In particular, a suite of 30 or 60 records selected using the refined algorithm can lead to statistically stable results similar to those obtained from a much larger set. The proposed algorithm is computationally efficient. It shows great potential in the performance-based earthquake design of nonlinear civil systems.

[1]  K. Campbell.  Campbell-Bozorgnia NGA Ground Motion Relations for the Geometric Mean Horizontal Component of Peak and Spectral Ground Motion Parameters , 2007 .

[2]  J. Baker,et al.  Correlation of Spectral Acceleration Values from NGA Ground Motion Models , 2008 .

[3]  BrianS-J. Chiou,et al.  An NGA Model for the Average Horizontal Component of Peak Ground Motion and Response Spectra , 2008 .

[4]  Curt B. Haselton,et al.  Assessing seismic collapse safety of modern reinforced concrete moment frame buildings , 2006 .

[5]  J. Stewart,et al.  Prediction Equations for Significant Duration of Earthquake Ground Motions considering Site and Near-Source Effects , 2006 .

[6]  J. Baker,et al.  Spectral shape, epsilon and record selection , 2006 .

[7]  Maurice S. Power,et al.  An Overview of the NGA Project , 2008 .

[8]  M. Power.  DESIGN GROUND MOTION LIBRARY , 2004 .

[9]  I. M. Idriss,et al.  Comparisons of the NGA Ground-Motion Relations , 2008 .

[10]  K. Campbell,et al.  NGA Ground Motion Model for the Geometric Mean Horizontal Component of PGA, PGV, PGD and 5% Damped Linear Elastic Response Spectra for Periods Ranging from 0.01 to 10 s , 2008 .

[11]  N. Abrahamson,et al.  Selection of ground motion time series and limits on scaling , 2006 .

[12]  Jonathan D. Bray,et al.  Simplified Procedure for Estimating Earthquake-Induced Deviatoric Slope Displacements , 2007 .

[13]  Anastasios Sextos,et al.  Selection of earthquake ground motion records: A state-of-the-art review from a structural engineering perspective , 2010 .

[14]  Norman A. Abrahamson,et al.  An Overview of the Project of Next Generation of Ground Motion Attenuation Models for Shallow Crustal Earthquakes in Active Tectonic Regions , 2006 .

[15]  Nick Gregor,et al.  NGA Project Strong-Motion Database , 2008 .

[16]  C. Allin Cornell,et al.  Earthquakes, Records, and Nonlinear Responses , 1998 .

[17]  Ellen M. Rathje,et al.  A Semi-Automated Procedure for Selecting and Scaling Recorded Earthquake Motions for Dynamic Analysis , 2008 .