This study investigates the influence of ground motion duration on the dynamic deformation capacity of a suite of 10 modern reinforced concrete moment frame buildings. A robust numerical algorithm is proposed to estimate the dynamic deformation capacity of a structure by conducting incremental dynamic analysis. The geometric mean dynamic deformation capacity of the considered buildings was, on average, found to be 26% lower under long duration ground motions, compared to spectrally equivalent short duration ground motions. A consistent effect of duration on dynamic deformation capacity was observed over a broad range of structural periods considered in this study. Response spectral shape, however, was found to not significantly influence dynamic deformation capacity. These results indicate that the effect of duration could be explicitly considered in seismic design codes by modifying the deformation capacities of structures.
With the aim of evaluating the effect of spatial variability of recorded ground motions on spatially extended structures, we present a numerical study on the linear and non-linear response of an idealized integral-abutment bridge, subject to the 2004 Parkfield recordings at the UPSAR array. The results show that spatial variability of recorded motion may present features which are poorly predictable by standard coherency approaches and this may have a considerable impact even on a regular, 300-m long structure on homogenous stiff soil conditions, leading to localized increase or decrease of engineering demands parameters up to a factor of about 50%.
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