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Possibilities for Evaluating Seismic Drift by Linear and Non-linear Methods

Maximum displacements, rather than maximum stresses, represent the proper design criteria. The quality of drift estimates for the r/c frames with non-uniform stiffness distribution along the height is evaluated by three different methods for drift evaluation and compared with the inelastic member-by-member time history analysis. The first procedure (DBD-Priestley, 6) is based on design displacement spectra and characterization of the structure by an equivalent secant stiffness to maximum response, with hysteretic energy dissipation represented by equivalent viscous damping. The second procedure (N2-Fajfar et al., 5) uses two separate mathematical models (MDOF and SDOF) and combines response spectrum approach and non-linear static (pushover) analysis method. The third procedure (LINEAR-Sozen et al., 8) is based on the linear elastic analysis and limit state design of the sections. Design process defined by this method assigns a minor role to lateral strength in earthquake-resistant design.

displacement; performance; non-linear response; methods; comparisson

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