Constant ductility response spectra are presented for 15 recorded earthquakes groundmotions using the Yield Point Spectra (YPS) representation. Yield Point Spectra are used foranalysis and design of SDOF structures. The spectra were computed for bilinear and stiffnessdegrading load-deformation models, for displacement ductilities equal to 1, 2, 4 and 8.A methodology for the performance-based seismic design of regular multistorybuildings using Yield Point Spectra is described. The methodology is formulated to make useof current code approaches as much as possible while allowing the design engineer to limitthe peak displacement response and, to some extent, the peak interstory drift to user-specifiedvalues. To achieve this objective, the design methodology makes use of an equivalent SDOFmodel of the building.A method to estimate peak displacement response and interstory drift indices ofmultistory buildings using YPS and establish SDOF formulations is also presented. Themethod may be considered a new nonlinear static procedure (NSP). Interstory drift indices(IDIs) are estimated using deformed shapes of the building based on the first mode shape andcombinations of the first and second mode shapes.
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