Impact of ground-motion duration on nonlinear structural performance: Part I: spectrally equivalent records and inelastic single-degree-of-freedom systems

In current seismic performance-based assessment approaches, nonlinear dynamic analysis of structures generally relies on ground motions selected based their pseudo-spectral accelerations, with little or no consideration for ground-motion duration. Part I this study, presented in article, attempts to comprehensively quantify the impact duration structural performance case-study inelastic single-degree-of-freedom systems shallow-crustal seismicity conditions. The effect is decoupled from that amplitude and spectral shape by assembling sets spectrally equivalent long- short-duration records. Such are employed incremental analyses a wide range computational models incorporating in-cycle cyclic strength stiffness deterioration. response quantified terms peak- cumulative-based engineering demand parameters. Formal hypothesis testing used assess statistical significance duration’s median capacity considered systems. Furthermore, derivation duration-dependent fragility vulnerability relationships demonstrates effectively impacts various systems, it should be accounted practice. values highly deteriorating under long-duration found up 21% 34.0% smaller than counterpart if parameter adopted, respectively.