Improved effective damping equation for equivalent linear analysis of seismic-isolated bridges

Date

2006-02-01

Author

Dicleli, Murat

Metadata

Show full item record

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

Item Usage Stats

146
views

0
downloads

In this study, an improved effective damping (ED) equation is proposed to obtain more reasonable estimates of the actual nonlinear response of seismic-isolated bridges (SIB) using equivalent linear (EL) analysis procedure. For this purpose, first the EL analysis results using AASHTO's ED equation is evaluated using harmonic and seismic ground motions. The effect of several parameters such as substructure stiffness, isolator properties, and the intensity and frequency characteristics of the ground motion are considered in the evaluation. Next, the effect of the superstructure mass on the ED ratio is studied. It is found that the accuracy of the EL analysis results is affected by the frequency characteristics and intensity of the ground motion. It is also demonstrated that AASHTO's ED equation should incorporate the effective period of the SIB and isolator properties for a more accurate estimation of the seismic response quantities. A new ED equation that includes such parameters is formulated and found to improve the accuracy of the EL analysis.

Subject Keywords

Geotechnical Engineering and Engineering Geology, Geophysics

URI

https://hdl.handle.net/11511/40057

Journal

EARTHQUAKE SPECTRA

DOI

https://doi.org/10.1193/1.2150187

Collections

Department of Engineering Sciences, Article

Suggestions

OpenMETU
Core

Improved effective damping equation for equivalent linear analysis of seismic-isolated bridges Dicleli, Murat (null; 2010-07-25) In this paper, an improved effective damping (ED) equation is proposed to obtain more reasonable estimates of the actual nonlinear response of seismic-isolated bridges (SIB) using equivalent linear (EL) analysis procedure. For this purpose, first, the EL analysis results using AASHTO's ED equation is evaluated. The effect of several parameters such as substructure stiffness, isolator and ground motion properties are considered in the evaluation. It is found that AASHTO's ED equation should incorporate the e...
Practical Implementation of Generalized Force Vectors for the Multimodal Pushover Analysis of Building Structures Alici, F. Soner; Sucuoğlu, Haluk (SAGE Publications, 2015-05-01) A practical implementation of generalized multimodal pushover analysis is presented in this study, where the number of pushovers is reduced significantly in view of the number of modes contributing to seismic response. It has been demonstrated in two case studies that the reduced procedure for generalized pushover analysis is equally successful in estimating the maximum member deformations and forces under a ground excitation with reference to nonlinear response history analysis. It is further shown that th...
Elastic and Inelastic Near-Fault Input Energy Spectra Alici, F. Soner; Sucuoğlu, Haluk (SAGE Publications, 2018-05-01) The main purpose of this study is to develop a reliable model for predicting the input energy spectra of near-fault ground motions for linear elastic and inelastic systems, and to evaluate the effect of damping and lateral strength on energy dissipation demands. An attenuation model has been developed through one-stage nonlinear regression analysis. Comparative results revealed that near-fault ground motions have significantly larger energy dissipation demands, which are very sensitive to earthquake magnitu...
Experimental evaluation of geomembrane/geotextile interface as base isolating system Kalpakci, V.; Bonab, A. T.; Özkan, M. Yener; Gülerce, Zeynep (Thomas Telford Ltd., 2018-02-01) The objective of this study is to evaluate the effect of the geomembrane/geotextile interface on the seismic response of small-to-moderate height structures. Three building models with first-mode natural frequencies changing between 2-4 Hz (representing two, three and four storey structures) were tested with and without the addition of geomembrane/geotextile interface using the shaking table test setup by employing harmonic and modified/ scaled ground motions. Experimental results showed that the geomembran...
Application of the modified Q-slope classification system for sedimentary rock slope stability assessment in Iran Azarafza, Mohammad; Nanehkaran, Yaser A.; Rajabion, Lila; Akgün, Haluk; Rahnamarad, Jafar; Derakhshani, Reza; Raoof, Amir (Elsevier BV, 2020-01-01) The Q-slope system is an empirical method for discontinuous rock slope engineering classification and assessment. It has been introduced recently to provide an initial prediction of rock slope stability assessment by applying simple assumptions which tend to reflect different failure mechanisms. This study offers a correlation relationship between Q-slope and slope stability degree using case studies of sedimentary rock slopes from 10 regions of Iran. To this end, we have investigated 200 areas from these r...

Citation Formats

M. Dicleli, “Improved effective damping equation for equivalent linear analysis of seismic-isolated bridges,” EARTHQUAKE SPECTRA, pp. 29–46, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40057.