||Peter FAJFAR // 1.01 Izvirni znanstveni članek
||CHAI, Y. H., FAJFAR, Peter, ROMSTAD, K. M.
Formulation of duration-dependent inelastic seismic design spectrum. J.
struct. eng. (New York, N.Y.), 1998, vol. 124, no. 8, str. 913-921, graf.
||In this paper, a procedure for developing the
duration-dependent inelastic seismic design spectrum is proposed. The approach
assumes that the lateral strength of the structure can be increased to
compensate for the increased number of inelastic cycles that may be imposed on
the structure under a long duration ground motion. Seismic input energy is
considered as a part of the demand on the structure, and an empirical prediction
of the seismic input energy in terms of the ground motion duration is made.
Seismic design is established by requiring the structure to have a cyclic
plastic strain energy capacity that is larger or equal to the portion of the
seismic input energy contributing to cumulative damage. The plastic strain
energy capacity of the structure is calculated using an energy-based cumulative
damage model. Results from this study indicated that an increase in the lateral
strength demand can be expected for an increase in the duration of the ground
motion, and the increase in lateral strength is largest near the characteristic
period of the ground motion. The strength deterioration parameter that
characterizes the plastic strain energy capacity of the structure has been found
to have a significant influence on the duration-dependent inelastic seismic
design spectrum [COBISS.SI-ID 550497]
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