Influence of Ground Motion Scaling Methods on Seismic Response of Bridges

Date

2024-01-01

Author

Gözütok, M.
Yakut, Ahmet
Yılmaz, Mustafa Tolga

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

19
views

0
downloads

Cite This

In engineering practice in Türkiye, there are three main codes employed for bridge design which are AASHTO LRFD Design Specifications for Bridge Design, Eurocodes and Turkish Earthquake Specification for Bridges. These codes have different seismic design criteria for the selection of ground motion records and design response spectra used in analysis. In this study, influence of ground motion scaling method on response of bridges is evaluated through linear time history analysis. For this purpose, three bridges representing short-, medium-, and long-period bridges are selected in Istanbul that lay near the Northern Anatolia Fault. Three scaling methods are employed to study the effect of scaling methods. The first method is to scale the ground motion records with one factor according to the mean spectrum of selected earthquakes. The second and third methods are to scale each ground motion record separately. No upper limits for the scale factors are introduced for the second method, while for the third method upper limit of 2 is assigned. Besides, to comprehend the importance of the selection of ground motion sets, three different sets, each having seven ground motion records, are formed. Analyses results like column moments and displacements under the selected and scaled ground motion sets are compared. The results indicated that the scaling methods and ground motion sets for the bridges having different fundamental periods do not have consistent results. It has been observed that, in general, the influence of ground motion set becomes insignificant as the period of the structure gets smaller. As a general conclusion, it appeared that no generalization can be made regarding the selection of a ground motion record set and scaling method for the studied bridges. It is suggested that various methods and ground motion sets should be employed to conduct a correct time history analysis and to meet the seismic demands of a specific structure.

Subject Keywords

Ground motion scaling, RC bridges, Seismic bridge design codes, Time history analysis

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85204354483&origin=inward
https://hdl.handle.net/11511/111968

Collections

Department of Civil Engineering, Conference / Seminar