Comparing response of SDF systems to near‐fault and far‐fault earthquake motions in the context of spectral regions

Abstract

SUMMARYIn spite of important di erences in structural response to near-fault and far-fault ground motions, this paper aims at extending well-known concepts and results, based on elastic and inelastic response spectra for far-fault motions, to near-fault motions. Compared are certain aspects of the response of elastic and inelastic SDF systems to the two types of motions in the context of the acceleration-, velocity-, and displacement-sensitive regions of the response spectrum, leading to the following conclusions. (1) The velocity-sensitive region for near-fault motions is much narrower, and the acceleration-sensitive and displacement-sensitive regions are much wider, compared to far-fault motions; the narrower velocitysensitive region is shifted to longer periods. (2) Although, for the same ductility factor, near-fault ground motions impose a larger strength demand than far-fault motions-both demands expressed as a fraction of their respective elastic demands-the strength reduction factors Ry for the two types of motions are similar over corresponding spectral regions. (3) Similarly, the ratio um=u 0 of deformations of inelastic and elastic systems are similar for the two types of motions over corresponding spectral regions.

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

“…Such pulse is typically observed at the beginning of the fault-normal (FN) ground velocity time-history and has a probability of occurrence that depends on the site-to-source geometry, earthquake magnitude and other parameters (Somerville et al 1997;Iervolino and Cornell 2008). Starting from the pioneer studies of Veletsos and Newmark (1960) and Bertero et al (1978), the response of yielding single-degree-of-freedom systems subjected to near-fault earthquake ground motions has been extensively studied (Chopra and Chintanapakdee 2003;Mavroeidis et al 2004 and references therein). Other studies focused on yielding frames and showed the potential of near-fault ground motions to induce large story drifts (Alavi and Krawinkler 2004;Makris and Psychogios 2006;Karavasilis et al 2010 and references therein).…”

Evaluating Main Parameters Effects of Near-Field Earthquakes on the Behavior of Concrete Structures with Moment Frame System

“…Above ratios directly affect T e period (the period that distinct the acceleration-sensitive and velocity-sensitive zones in the response spectrum), and T d (the period that distinct the velocity-sensitive and displacement-sensitive zones in the response spectrum) and conclude that the velocity-sensitive zones become narrower and acceleration-sensitive and displacement-sensitive zones become wider [7]. In Figure 2.a.…”

Seismic Responses of Regular Highway Bridges Under Near-Fault Ground Motions

“…In order to capture the salient response features of pulses, several studies have examined the response spectra of single-pulse or separate pulse [16] [17], but a systematic analysis of the pulse parameters has not been performed.…”