https://orcid.org/0000-0003-4430-0315
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ABSTRACT
The close proximity of some populated cities all over the world to the active faults shows the necessity to investigate the consequences of the prominent characteristics of near-fault pulse-like ground motions (i.e., the forward directivity and fling-step) on the seismic performance of the code-compliant multi-story buildings. This paper attempts to quantify the effects of pulse-like near-fault ground motions on the seismic responses of reinforced concrete (RC) moment-resisting frame (MRF) buildings and to compare the results with those induced by non-pulse-like ground motions. For this purpose, three archetype buildings with 3-, 9-, and 18-story heights were designed in accordance with the provisions of ASCE 7–10 and were subjected to 48 ground motions in four sets including the forward-directivity, fling-step, non-pulse near-fault, and far-fault records. The results demonstrate that the contribution of higher modes to the seismic responses is more predominant in the non-pulse-like ground motions than their pulse-like counterparts. Moreover, the maximum seismic demands imposed by the pulse-like ground motions are higher than those for the non-pulse-like motions. A detailed assessment of the seismic performance of the RC buildings based on Tier 3 systematic evaluation of the ASCE 41–17 standard is another objective of this study. Findings from this evaluation reveal that the 3-story frame fails to meet the acceptance criteria under the pulse-like ground motions, whereas both the 9- and 18-story frames satisfy the performance criteria of ASCE 41–17 for both the pulse-like and non-pulse-like ground motions. This indicates that the performance of the buildings designed in accordance with ASCE 7–10 does not necessarily satisfy the performance expected in ASCE 41–17.