Damping effect on seismic input energy and its verification by shake table tests

Ahmet Gullu*, Ercan Yuksel, Cem Yalcin, Oral Buyukozturk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Seismic input energy per unit mass (EI/m) imparted into a structure is a function of earthquake (duration, frequency content, amplitude etc.), soil (shear velocity, dominant period etc.) and the structural (vibrational periods etc.) characteristics. Generally, the damping properties of the structure is assumed negligible for seismic input energy. Most of the existing spectral equations derived for SDOF systems generally use a constant damping ratio of 5%. In this study, the damping effect on EI/m is investigated experimentally and numerically on SDOF systems with distinct damping ratios. Experimental investigation and numerical computations proved that seismic input energy is very sensitive to variation of damping within the vicinity of fundamental frequencies. Specifically, up to 50% increment was observed in the plateau region of the input energy spectrum, where maximum EI/m values occur, by variation of damping from 2% to 10%. Hence, a novel damping modification factor (DMF), which could be utilized for existing energy spectra, is proposed in this paper. Validation studies of the proposed DMF are achieved through the various energy spectra found in the literature.

Original languageEnglish
Pages (from-to)2669-2683
Number of pages15
JournalAdvances in Structural Engineering
Volume24
Issue number12
DOIs
Publication statusPublished - Sept 2021

Bibliographical note

Publisher Copyright:
© The Author(s) 2021.

Funding

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study was conducted at the Structural and Earthquake Engineering Laboratory of Istanbul Technical University (STEELab). It was financed by the research project of ITU BAP 39305. Their support is gratefully acknowledged. The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study was conducted at the Structural and Earthquake Engineering Laboratory of Istanbul Technical University (STEELab). It was financed by the research project of ITU BAP 39305. Their support is gratefully acknowledged.

FundersFunder number
STEELab
International Technological UniversityBAP 39305
Istanbul Teknik Üniversitesi

    Keywords

    • damping effect
    • energy balance equation
    • energy-based design
    • input energy spectrum

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