Modal pushover-based scaling of earthquake records for nonlinear rha of multi-story unsymmetric-plan buildings

The modal-pushover-based-scaling (MPS) procedure explicitly considers structural strength, and determines a scaling factor for each record to match an inelastic target deformation value, and then selects a small set of scaled records that lead to accurate and efficient estimates of engineering demand parameters (EDPs). This paper extends the MPS procedure, currently restricted for symmetric-plan buildings, to multistory unsymmetric-plan buildings, and investigates the accuracy and efficiency of the developed MPS procedure for nonlinear RHA of three-dimensional (3D) structural systems. In addition, the developed procedure is compared against the ASCE/SEI 7-10 scaling procedure for 3D analysis. The accuracy of the extended MPS procedure was evaluated for nine unsymmetric-plan structures with 5, 10 and 15 stories. These buildings cover two levels of horizontal irregularity defined in ASCE/SEI 7-10. This evaluation of the MPS procedure has led to the following conclusions: (1) The MPS procedure provided accurate estimates of median values of EDPs, and reduced record-to-record variability of the responses; (2) The MPS procedure is much superior compared to the ASCE/SEI 7-10 procedure. 1 Assistant Professor, Dept. of Civil and Environmental Engineering, Universidad de los Andes, Bogota, Colombia. 2 Researcher, Dept. of Civil and Environmental Engineering, Universidad de los Andes, Bogota, Colombia. 3 Graduate Student, Dept. of Civil and Environmental Engineering, Universidad de los Andes, Bogota, Colombia. 4 Research Structural Engineer, Earthquake Science Center, United States Geological Survey, Menlo Park, CA 94025. Reyes JC, Riaño AC, Arango CM, Kalkan E. Modal pushover-based scaling of earthquake records for nonlinear response history analysis of multi-story unsymmetric-plan buildings. Proceedings of the 10 National Conference in Earthquake Engineering, Earthquake Engineering Research Institute, Anchorage, AK, 2014. Tenth U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering July 21-25, 2014 Anchorage, Alaska 10NCEE Modal Pushover-based Scaling of Earthquake Records for Nonlinear RHA of Multi-story Unsymmetric-plan Buildings J. C. Reyes, A. C. Riaño, C. M. Arango, and E. Kalkan