On the use of instantaneous power for near-fault record modification

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National Technical University of Athens

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The current seismic design and assessment procedures describe the seismic demand in terms of elastic spectral accelerations, which may not be adequate to capture the destructive effects of near-fault ground motions. The relevant characteristics of near-fault records, such as the presence of a velocity pulse, the pulse amplitude, and the pulse period (Tp), make the record selection and modification task more challenging. A newly proposed intensity measure, called Instantaneous Power (IP(T1)), takes into account the effects of velocity pulses on structural response. It has been shown that vector IM including IP(T1) and elastic spectral acceleration at the first mode period of structure Sa(T1) results in more reliable and accurate structural responses compared to the traditional IM, Sa(T1). A new matching method is developed to incorporate the effects of IP into the record modification process. The procedure combines a widely used time-domain spectral matching algorithm, RspMatch, and a velocity adjustment approach to simultaneously match the target response spectrum and IP spectrum. We investigate the extent to which controlling the IP parameter in the modification process affects the nonlinear structural response by comparing the results of single-degree-of-freedom (SDOF) systems and multi-degree-of-freedom (MDOF) system, under the sets of Sa-only matched and Sa- and IP- matched records. Our findings show that the consideration of IP in the record matching can help prevent potential bias in structural response. © 2021 COMPDYN Proceedings.


8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2021 -- 28 June 2021 through 30 June 2021 -- -- 174550

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Modification, Near-fault ground motions, Record selection, Spectral matching, Velocity pulses


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