CAPACITY SPECTRUM METHOD BASED ON INELASTIC DEMAND SPECTRA
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CAPACITY SPECTRUM METHOD BASED ON INELASTIC DEMAND SPECTRA
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CAPACITY SPECTRUM METHOD BASED ON INELASTIC DEMAND SPECTRA

Author: PETER FAJFAR* Faculty of Civil and Geodetic Engineering, University of Ljubljana, Ljubljana, Slovenia | Size: 156 KB | Format: PDF | Quality: Unspecified | Publisher: EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS Earthquake Engng. Struct. Dyn. 28, 979}993 (1999) | Year: 1999 | pages: 15


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By means of a graphical procedure, the capacity spectrum method compares the capacity of a structure with
the demands of earthquake ground motion on it. In the present version of the method, highly damped elastic
spectra have been used to determine seismic demand. A more straightforward approach for the determination
of seismic demand is based on the use of the inelastic strength and displacement spectra which can be
obtained directly by time-history analyses of inelastic SDOF systems, or indirectly from elastic spectra.
The advantages of the two approaches (i.e. the visual representation of the capacity spectrum method and
the superior physical basis of inelastic demand spectra) can be combined. In this paper, the idea of using
inelastic demand spectra within the capacity spectrum method has been elaborated and is presented in an
easy to use format. The approach represents the so-called N2 method formulated in the format of the
capacity spectrum method. By reversing the procedure, a direct displacement-based design can be performed.
The application of the modi"ed capacity spectrum method is illustrated by means of two examples.
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