Comprehensive evaluation of equivalent linear analysis method for seismic-isolated structures represented by sdof systems

Date

2007-08-01

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

202
views

0
downloads

In this study, the equivalent linear (EL) analysis procedure used in the design of seismic-isolated structures is evaluated. The effect of several parameters such as the intensity and frequency characteristics of the ground motion, isolator properties and the structure mass are considered in the evaluation. First, the EL analysis procedure is evaluated using harmonic ground motions with various excitation periods and a suite of 15 seismic ground motions with various frequency characteristics. Then, the effect of the structure mass on the effective damping ratio and hence on the accuracy of the EL analysis results is investigated. This is followed by regression analyses of the acquired data to assess the effect of various parameters on the accuracy of the EL analysis results. It is found that the accuracy of the EL analysis results is affected by the peak ground acceleration to peak ground velocity ratio of the ground motion as well as the intensity of the ground motion relative to the characteristic strength of the isolator. It is also demonstrated that the effective damping equation currently used in the design of seismic-isolated structures must incorporate the effective period of the structure and frequency characteristics of the ground motion for a more accurate estimation of seismic response quantities. A new effective damping equation that includes such parameters is formulated and found to improve the accuracy of the EL analysis results.

Subject Keywords

Seismic isolation, Nonlinear response, Equivalent linear analysis, Effective period, Effective damping

URI

https://hdl.handle.net/11511/49186

Journal

ENGINEERING STRUCTURES

DOI

https://doi.org/10.1016/j.engstruct.2006.09.013

Collections

Department of Engineering Sciences, Article

Suggestions

OpenMETU
Core

Equivalent linear analysis of seismic-isolated bridges subjected to near-fault ground motions with forward rupture directivity effect Dicleli, Murat (2007-01-01) This study encompasses the assessment of the equivalent linear (EL) analysis procedure for the design of seismic isolated bridges (SIB) subjected to near-fault ground motions with forward rupture directivity effect. The assessment procedure involves the comparison of the seismic response quantities obtained from EL analyses with those obtained from nonlinear time history (NLTH) analyses. The effect of several isolator and near-fault ground motion properties are considered in the assessment of the EL analysi...
Performance comparisons of seismic assessment methods with PSD test results of a deficient RC frame Ozcebe, G.; KURT, ELİF; Binici, Barış; Kurç, Özgür; Canbay, Erdem; Akpinar, U. (2009-12-01) The accuracy of estimating the performance levels of a deficient RC frame using linear elastic and nonlinear dynamic analysis is evaluated in this study. This was achieved by comparing the response of a structure tested with pseudo-dynamic testing and estimated by the linear elastic assessment procedures along with nonlinear dynamic analysis. The test structure (three bay-two storey planar frame) is a 1/2 scale reinforced concrete frame having masonry infill walls in the central span. The test frame contain...
Improved effective damping equation for equivalent linear analysis of seismic-isolated bridges Dicleli, Murat (SAGE Publications, 2006-02-01) 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...
Nonlinear Structural Coupling: Experimental Application Kalaycioglu, Taner; Özgüven, Hasan Nevzat (2014-02-06) In this work, the nonlinear structural modification/coupling technique proposed recently by the authors is applied to a test system in order to study the applicability of the method to real structures. The technique is based on calculating the frequency response functions of a modified system from those of the original system and the dynamic stiffness matrix of the nonlinear modifying part. The modification can also be in the form of coupling a nonlinear system to the original system. The test system used i...
Comparison of ASCE/SEI Standard and modal pushover-based ground motion scaling procedures for pre-tensioned concrete bridges Özgenoğlu, Müge; Arıcı, Yalın (2017-01-01) Complex analysis methods such as non-linear time-history analyses (NTHA) are often required for the design of non-standard bridges. The selection of the ground motions for the NTHA is a crucial task as the results of the analyses show a wide variability according to the selected records. In order to predict the demand in accordance with the seismic hazard conditions of the site, the selected motions are usually modified by scaling procedures. Within this context, the performance of two scaling methods, name...

Citation Formats

M. Dicleli, “Comprehensive evaluation of equivalent linear analysis method for seismic-isolated structures represented by sdof systems,” ENGINEERING STRUCTURES, pp. 1653–1663, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/49186.