Ground motion directionality in the 2010-2011 Canterbury earthquakes

2014 ◽  
Vol 44 (3) ◽  
pp. 371-384 ◽  
Author(s):  
Brendon A. Bradley ◽  
Jack W. Baker
Keyword(s):  
Ground Motion ◽  
Motion Directionality

Spatial seismic modeling of base-isolated buildings pounding against moat walls: effects of ground motion directionality and mass eccentricity

2016 ◽  
Vol 46 (7) ◽  
pp. 1161-1179 ◽  
Author(s):  
Eftychia A. Mavronicola ◽  
Panayiotis C. Polycarpou ◽  
Petros Komodromos
Keyword(s):  
Ground Motion ◽  
Seismic Modeling ◽  
Mass Eccentricity ◽  
Motion Directionality

Seismic fragility analysis of monopile offshore wind turbines considering ground motion directionality

2021 ◽  
Vol 235 ◽  
pp. 109414
Author(s):  
Renjie Mo ◽  
Renjing Cao ◽  
Minghou Liu ◽  
Miao Li ◽  
YunPing Huang
Keyword(s):  
Ground Motion ◽  
Wind Turbines ◽  
Offshore Wind ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Offshore Wind Turbines ◽  
Motion Directionality

Site Effects on Ground Motion Directionality: Lessons from Case Studies in Japan

2021 ◽  
Vol 147 ◽  
pp. 106755
Author(s):  
María Elisa Ramos-Sepúlveda ◽  
Ashly Cabas
Keyword(s):  
Case Studies ◽  
Ground Motion ◽  
Site Effects ◽  
Motion Directionality

ON THE VARIATION OF MAXIMUM ISOLATOR DISPLACEMENTS DUE TO GROUND MOTION DIRECTIONALITY

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Gökhan Özdemir ◽  
Burak Erşeker ◽  
Özgür Avşar
Keyword(s):  
Ground Motion ◽  
Nonlinear Response ◽  
Ground Motions ◽  
Original Form ◽  
Motion Direction ◽  
Applied Loading ◽  
Lead Rubber Bearings ◽  
Motion Directionality ◽  
Rubber Bearings ◽  
Ground Motion Records

In most of the cases, code specifications dictate the use of nonlinear response history analyses (NRHA) to estimate maximum isolator displacements (MIDs) of a seismically isolated structure (SIS). For this purpose, a set of ground motion records with similar characteristics needs to be selected. Then, the structure is analyzed bidirectionally by considering both orthogonal horizontal components of these records. However, there is not any provision regarding the ground motion directionality effect in the codes but simply use of as-recorded motions is encouraged. This study investigates the effect of ground motion directionality on variation of MIDs in case of bidirectional NRHA. Thus, a typical SIS, where the isolator units are composed of lead rubber bearings (LRBs), is subjected to ground motions rotated from their as-recorded original form by increments of 10o up to 360o. Here, LRBs are modelled by a deteriorating hysteretic representation in which the strength of the isolator reduces gradually due to the applied loading. In the analyses, first, the original as-recorded ground motion is applied to the SIS and the corresponding MID is noted. Then, the same structure is subjected to rotated versions of the same motion and again the MIDs are noted. To quantify the variation in the isolator displacement, analytically obtained MIDs are compared. Results showed that there is an amplification in MIDs due to change in ground motion direction.

Within-Station Variability in Kappa: Evidence of Directionality Effects

2020 ◽  
Vol 110 (3) ◽  
pp. 1247-1259
Author(s):  
Chunyang Ji ◽  
Ashly Cabas ◽  
Fabrice Cotton ◽  
Marco Pilz ◽  
Dino Bindi
Keyword(s):  
Ground Motion ◽  
Focal Depth ◽  
Seismic Hazard Assessment ◽  
Seismic Attenuation ◽  
Motion Modeling ◽  
Local Site ◽  
Direct Corollary ◽  
Potential Factors ◽  
Motion Directionality ◽  
Model Variability

ABSTRACT One of the most commonly used parameters to describe seismic attenuation is the high-frequency spectral decay parameter Kappa (κr), yet the physics behind it remain little understood. A better understanding of potential factors that lead to large scatter in estimated values of κr constitutes a critical need for ground-motion modeling and seismic hazard assessment at large. Most research efforts to date have focused on studying the site-to-site and model-to-model variability of κ, but the uncertainties in individual κr estimations associated with different events at a selected site (which we refer to as the within-station variability of κr) remain uncharacterized. As a direct corollary, obtaining robust estimates of the site-specific component κ0, and their corresponding interpretation become a challenge. To understand the sources of the variability observed in κr (and κ0) at a single site, we select 10 Japanese Kiban–Kyoshin network (KiK-net) downhole arrays and investigate the systematic contributions from ground-motion directionality. We observe that κr estimated from a single horizontal component is orientation dependent. In addition, the influence of ground-motion directionality is a function of local site conditions. We propose an orientation-independent κr-value, which is not affected either by ground-motion directionality or by the events’ azimuths. In addition, we find that focal depth of events used in κr calculations affects the estimation of the regional attenuation component κR, which, in turn, influences the within-station variability in the κ0 model.

NGA-West2 Models for Ground Motion Directionality

2014 ◽  
Vol 30 (3) ◽  
pp. 1285-1300 ◽  
Author(s):  
Shrey K. Shahi ◽  
Jack W. Baker
Keyword(s):  
Ground Motion ◽  
Earthquake Engineering ◽  
Hazard Analysis ◽  
Ground Motions ◽  
Response Spectra ◽  
Engineering Research ◽  
The Pacific ◽  
Horizontal Ground Motion ◽  
Motion Directionality ◽  
The Relationship

The NGA-West2 research program, coordinated by the Pacific Earthquake Engineering Research Center (PEER), is a major effort to produce refined models for predicting ground motion response spectra. This study presents new models for ground motion directionality developed as part of that project. Using a database of recorded ground motions, empirical models have been developed for a variety of quantities related to direction-dependent spectra. A model is proposed for the maximum spectral acceleration observed in any orientation of horizontal ground motion shaking ( Sa RotD100), which is formulated as a multiplicative factor to be coupled with the NGA-West2 models that predict the median spectral accelerations over all orientations ( Sa RotD50). Models are also proposed for the distribution of orientations of the Sa RotD100 value, relative to the fault and the relationship between Sa RotD100 orientations at differing periods. Discussion is provided regarding how these results can be applied to perform seismic hazard analysis and compute realistic target spectra conditioned on different parameters.

Seismic fragility analysis of irregular bridges with non-circular tall piers considering ground motion directionality

2019 ◽  
Vol 18 (4) ◽  
pp. 1723-1753 ◽  
Author(s):  
Deshan Shan ◽  
Faxian Qu ◽  
Xudong Deng
Keyword(s):  
Ground Motion ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Motion Directionality ◽  
Irregular Bridges
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