Probabilistic loss assessment of curved bridges considering the effect of ground motion directionality

2021 ◽  
Author(s):  
Ruiwei Feng ◽  
Wancheng Yuan ◽  
Anastasios Sextos
Keyword(s):  
Ground Motion ◽  
Loss Assessment ◽  
Curved Bridges ◽  
Motion Directionality

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

scholarly journals Seismic Performance of Curved Bridges with Longitudinal Slope

2019 ◽  
Vol 9 (4) ◽  
pp. 771
Author(s):  
Peng Su ◽  
Yanjiang Chen ◽  
Zhongwei Zhao ◽  
Weiming Yan
Keyword(s):  
Ground Motion ◽  
Structural Response ◽  
Seismic Excitation ◽  
Tangential Displacement ◽  
Site Conditions ◽  
Rotation Effect ◽  
Curved Bridges ◽  
Curved Bridge ◽  
Displacement Response ◽  
Main Girder

A curved bridge test model with a scale ratio of 1:10 was constructed to investigate the influence of site conditions on curved bridges with longitudinal slopes based on a similar theory. The natural ground motions of five different groups, namely, Sites A–E, were selected from the Pacific Earthquake Engineering Center (PEER) seismic database, and the shaking table model test was conducted under horizontal unidirectional and bidirectional excitations. Results showed that the structural response of the curved bridge is sensitive to the ground motion of different site conditions. Spatial characteristics are observed in the main girder structural response of the curved bridge. When the curved bridge is parallel to the direction of the principal ground motion, the rotation effect of the main girder is greater than that perpendicular to the direction of the principal ground motion. The rotation effect of the main girder leads to evident beam end and bearing displacements at the low pier. The seismic excitation direction and pier height notably affect the displacement response of the pier, and the tangential displacement response of the fixed pier is sensitive to seismic excitation.

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

Comparing Empirical and Analytical Estimates of Earthquake Loss Assessment Studies for the City of Dehradun, India

2012 ◽  
Vol 28 (2) ◽  
pp. 595-619 ◽  
Author(s):  
Dominik H. Lang ◽  
Yogendra Singh ◽  
J. S. R. Prasad
Keyword(s):  
Ground Motion ◽  
Indian Subcontinent ◽  
Empirical Studies ◽  
Earthquake Risk ◽  
Test Bed ◽  
Building Vulnerability ◽  
Loss Assessment ◽  
Northern India ◽  
Capacity Spectrum ◽  
The City

Very few earthquake risk studies exist for cities on the Indian subcontinent. The few studies that do exist typically focus on intensity as the parameter to describe the expected ground motion during an earthquake and on damage observations to represent building vulnerability. In contrast to these empirical studies, analytical loss computations, which are based on capacity spectrum methods (CSM), have recently become popular and are gaining wide acceptance. Analytical damage and loss computations have been conducted for the test bed Dehradun, a city of 500,000 inhabitants in the foothills of the Himalayas (northern India), and then compared with loss estimates from empirical studies recently performed for the city. The study illustrates the problems associated with trying to generate intensity-compatible ground motion estimates and comparing the damage and loss estimates of both approaches.

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.

Uncertainty and Correlation for Loss Assessment of Spatially Distributed Systems

2007 ◽  
Vol 23 (4) ◽  
pp. 753-770 ◽  
Author(s):  
Renee Lee ◽  
Anne S. Kiremidjian
Keyword(s):  
Risk Assessment ◽  
Ground Motion ◽  
San Francisco ◽  
Structural Damage ◽  
Transportation Networks ◽  
Correlation Model ◽  
Loss Assessment ◽  
Monetary Loss ◽  
Coefficients Of Variation ◽  
Spatially Distributed

Seismic risk assessment for a spatially distributed system, such as a lifeline network, involves characterization of ground shaking and structural damage for multiple structures in a region. The expected value of monetary loss, a common measure of the risk, has been previously formulated but with little attention to the uncertainty around this monetary loss. Furthermore, prior research on risk assessment for lifeline systems, in particular transportation networks, assumes no spatial ground motion correlation and no structure-to-structure damage correlation between sites in the network. In this paper, a framework for treating these correlations in the network risk analysis is presented. A demonstration of this methodology is carried out for two transportation networks located in the San Francisco Bay region. Coefficients of variation for network physical loss using a non–distance dependent ground motion correlation model in the framework range between 0.6 and 1.5 for the sample networks presented here. Coefficients of variation for network physical loss using a distance-dependent ground motion correlation model in the framework range between 1.0 and 1.4 for the same networks. It is demonstrated through these applications that assuming no correlation in ground motion and in damage may potentially underestimate uncertainty in the overall loss estimation.

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.

Sign in / Sign up

Export Citation Format

Share Document