Seismic demand models for probabilistic risk analysis of near fault vertical ground motion effects on ordinary highway bridges

2011 ◽  
Vol 41 (2) ◽  
pp. 159-175 ◽  
Author(s):  
Zeynep Gulerce ◽  
Emrah Erduran ◽  
Sashi K. Kunnath ◽  
Norman A. Abrahamson
Keyword(s):  
Risk Analysis ◽  
Ground Motion ◽  
Highway Bridges ◽  
Seismic Demand ◽  
Probabilistic Risk Analysis ◽  
Near Fault ◽  
Vertical Ground Motion ◽  
Demand Models ◽  
Vertical Ground ◽  
Probabilistic Risk

scholarly journals Numerical assessment of vertical ground motion effects on highway bridges

2020 ◽  
Vol 47 (7) ◽  
pp. 790-800 ◽  
Author(s):  
Hadi Aryan ◽  
Mehdi Ghassemieh
Keyword(s):  
Ground Motion ◽  
Numerical Study ◽  
Three Dimensional ◽  
Vertical Component ◽  
Time History ◽  
Highway Bridges ◽  
Vertical Excitation ◽  
Vertical Ground Motion ◽  
Field Evidence ◽  
Vertical Ground

Field evidence of recent earthquakes shows serious bridge damages due to the direct compression or tension in the columns and some flexural and shear failures caused by the variation in axial force of the columns. These damages could not be produced solely by the horizontal seismic excitations; the vertical component of the earthquake is involved. This paper presents a numerical study highlighting the presence of vertical seismic excitation. Nonlinear time history analyses are conducted on detailed three-dimensional models of multi-span simply supported and multi-span continuous bridges using a suite of representative ground motions. The results showed the significant influence of vertical excitation on the bridge responses. Therefore, it is imperative to include more efficient criteria to upgrade the design codes and extend practical techniques that consider and cope with the structural effects of vertical ground motion along with the horizontal excitations.

Near-fault vertical ground motion effects on the response of balanced cantilever bridges

2020 ◽  
Vol 173 (1) ◽  
pp. 17-33 ◽  
Author(s):  
Alemdar Bayraktar ◽  
Fatma Nur Kudu ◽  
Soner Sümerkan ◽  
Betül Demirtaş ◽  
Mehmet Akköse
Keyword(s):  
Ground Motion ◽  
Near Fault ◽  
Vertical Ground Motion ◽  
Vertical Ground

Vector-Valued Probabilistic Seismic Hazard Assessment for the Effects of Vertical Ground Motions on the Seismic Response of Highway Bridges

2010 ◽  
Vol 26 (4) ◽  
pp. 999-1016 ◽  
Author(s):  
Zeynep Gülerce ◽  
Norman A. Abrahamson
Keyword(s):  
Seismic Hazard ◽  
Seismic Response ◽  
Ground Motion ◽  
Ground Motions ◽  
Vertical Component ◽  
Highway Bridges ◽  
Probabilistic Seismic Hazard ◽  
Vertical Ground Motion ◽  
Vertical Ground Motions ◽  
Vertical Ground

The vertical ground motion component is disregarded in the design of ordinary highway bridges in California, except for the bridges located in high seismic zones (sites with design horizontal peak ground acceleration greater than 0.6 g). The influence of vertical ground motion on the seismic response of single-bent, two-span highway bridges designed according to Caltrans Seismic Design Code (SDC-2006) is evaluated. A probabilistic seismic hazard framework is used to address the probability of exceeding the elastic capacity for various structural parameters when the vertical component is included. Negative mid-span moment demand is found to be the structural parameter that is most sensitive to vertical accelerations.A series of hazard curves for negative mid-span moment are developed for a suite of sites in Northern California. The annual probability of exceeding the elastic capacity of the negative mid-span moment is as large as 0.01 for the sites close to active faults when the vertical component is included. Simplified approaches based on the distance to major faults or the median design peak acceleration show that there is a large chance (0.4 to 0.65) of exceeding the elastic limit if the current 0.6 g threshold is used for the consideration of vertical ground motions for ordinary highway bridges. The results of this study provide the technical basis for consideration of a revision of the 0.6 g threshold.

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