Extending modal pushover-based scaling procedure for nonlinear response history analysis of multi-story unsymmetric-plan buildings

The modal-pushover-based-scaling (MPS) procedure has been developed for appositely selecting and scaling earthquake records for nonlinear response history analyses (RHAs) of multi-story symmetric-plan and single-story unsymmetric-plan buildings. This procedure is extended here to unsymmetric-plan buildings with significant torsional response under bi-directional earthquake excitations. The accuracy of the procedure is evaluated by using three-dimensional computer models of nine unsymmetric-plan buildings with 5, 10 and 15 stories. These models were subjected to nonlinear RHAs considering sets of seven far-field records selected and scaled according to the extended modal-pushover-based-scaling (EMPS) procedure. Structural responses were compared against benchmark values, defined as the median values of the engineering demand parameters (EDPs) due to a larger set of unscaled far-field records. Also examined here is the ASCE/SEI 7-10 scaling procedure for comparison purposes. This study clearly shows that the EMPS procedure provides much superior results in terms of accuracy (true estimates of expected median EDPs) and efficiency (reduced record-to-record variability of EDPs) than the ASCE/SEI 7-10 scaling procedure for far-field ground motions. Thus, the EMPS is deemed to be an appropriate procedure for nonlinear RHAs of multi-story unsymmetric-plan buildings.

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

[2]  C. Allin Cornell,et al.  Probabilistic Basis for 2000 SAC Federal Emergency Management Agency Steel Moment Frame Guidelines , 2002 .

[3]  Erol Kalkan,et al.  Required number of records for ASCE/SEI 7 ground-motion scaling procedure , 2011 .

[4]  Anil K. Chopra,et al.  Modal Pushover-Based Scaling of Two Components of Ground Motion Records for Nonlinear RHA of Structures , 2012 .

[5]  P. Malhotra.  Strong-Motion Records for Site-Specific Analysis , 2003 .

[6]  Erol Kalkan,et al.  Assessment of spectrum matching procedure for nonlinear analysis of symmetric- and asymmetric-plan buildings , 2014 .

[7]  Babak Alavi,et al.  Behavior of moment‐resisting frame structures subjected to near‐fault ground motions , 2004 .

[8]  N. Null.  Minimum Design Loads for Buildings and Other Structures , 2003 .

[9]  A. Chopra,et al.  Inelastic Deformation Ratios for Design and Evaluation of Structures: Single-Degree-of- Freedom Bilinear Systems , 2004 .

[10]  Oscar A. Quintero,et al.  Modal pushover‐based scaling of earthquake records for nonlinear analysis of single‐story unsymmetric‐plan buildings , 2014 .

[11]  Eduardo Miranda,et al.  AMPLIFICATION FACTORS TO ESTIMATE INELASTIC DISPLACEMENT DEMANDS FOR THE DESIGN OF STRUCTURES IN THE NEAR FIELD , 2000 .

[12]  Sashi K. Kunnath,et al.  Effects of Fling Step and Forward Directivity on Seismic Response of Buildings , 2006 .

[13]  Anil K. Chopra,et al.  Evaluation of Modal Pushover–Based Scaling of One Component of Ground Motion: Tall Buildings , 2012 .

[14]  Farzad Naeim,et al.  Selection and Scaling of Ground Motion Time Histories for Structural Design Using Genetic Algorithms , 2004 .

[15]  Juan C. Reyes.  Modal Pushover-Based Scaling of Two Components of Ground Motion Records for Nonlinear RHA of Buildings , 2010 .

[16]  Anil K. Chopra,et al.  Modal-Pushover-Based Ground-Motion Scaling Procedure , 2011 .

[17]  R. P. Kennedy,et al.  Engineering characterization of ground motion. Task I. Effects of characteristics of free-field motion on structural response , 1984 .

[18]  Gang Wang,et al.  Design Ground Motion Library (DGML) – Tool for Selecting Time History Records for Specific Engineering Applications (Abstract) , 2007 .

[19]  Erol Kalkan,et al.  Documentation for assessment of modal pushover-based scaling procedure for nonlinear response history analysis of "ordinary standard" bridges , 2010 .

[20]  Kenneth T. Farrow,et al.  Ground motion scaling methods for different site conditions and structure characteristics , 2003 .

[21]  C. Allin Cornell,et al.  Structural performance assessment under near‐source pulse‐like ground motions using advanced ground motion intensity measures , 2008 .

[22]  Anil K. Chopra,et al.  Practical guidelines to select and scale earthquake records for nonlinear response history analysis of structures , 2010 .

[23]  Erol Kalkan,et al.  How Many Records Should be used in an ASCE/SEI-7 Ground Motion Scaling Procedure? , 2012 .

[24]  Anil K. Chopra,et al.  Three‐dimensional modal pushover analysis of buildings subjected to two components of ground motion, including its evaluation for tall buildings , 2011 .

[25]  W. J. Hall,et al.  Scaling Methods for Earthquake Response Spectra , 1984 .

[26]  Paolo Bazzurro,et al.  Probabilistic seismic demand analysis , 1998 .

[27]  Anil K. Chopra,et al.  Dynamics of Structures: Theory and Applications to Earthquake Engineering , 1995 .

[28]  Helmut Krawinkler,et al.  CONSIDERATION OF NEAR-FAULT GROUND MOTION EFFECTS IN SEISMIC DESIGN , 2000 .

[29]  Shiv Shanker Ravichandran,et al.  Seismic Design Factors for Steel Moment Frames with Masonry Infills: Part 2 , 2012 .

[30]  Nicolas Luco,et al.  Structure-Specific Scalar Intensity Measures for Near-Source and Ordinary Earthquake Ground Motions , 2007 .

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

[32]  J. Baker,et al.  Statistical Tests of the Joint Distribution of Spectral Acceleration Values , 2008 .

[33]  Erol Kalkan,et al.  Assessment of Modal-Pushover-Based Scaling Procedure for Nonlinear Response History Analysis of Ordi , 2012 .

[34]  N. Null.  Seismic Rehabilitation of Existing Buildings , 2007 .

[35]  Anil K. Chopra,et al.  A modal pushover analysis procedure to estimate seismic demands for unsymmetric‐plan buildings , 2004 .

[36]  C. Allin Cornell,et al.  Probabilistic seismic demand analysis of nonlinear structures , 1999 .

[37]  Anil K. Chopra,et al.  Evaluation of three‐dimensional modal pushover analysis for unsymmetric‐plan buildings subjected to two components of ground motion , 2011 .

[38]  Julian J. Bommer,et al.  Selection and Scaling of Real Accelerograms for Bi-Directional Loading: A Review of Current Practice and Code Provisions , 2007 .