Structural Engineering and Mechanics

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Estimation of seismic effective energy based parameter

  • Nemutlu, Omer Faruk (Civil Engineering Department, Faculty of Civil Engineering, Istanbul Technical University) ;
  • Sari, Ali (Civil Engineering Department, Faculty of Civil Engineering, Istanbul Technical University) ;
  • Balun, Bilal (Architecture Department, Faculty of Engineering and Architecture, Bingol University)
  • Received : 2022.03.06
  • Accepted : 2022.04.23
  • Published : 2022.06.25
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Abstract

The effect of earthquakes in earthquake resistant structure design stages is influenced by the highest ground acceleration value, which is generally a strength-based approach in seismic codes. In this context, an energy-oriented approach can be suggested as an alternative to evaluate structure demands. Contrary to the strength-based approach, the strength and displacement demands of the structure cannot be evaluated separately, but can be evaluated together. In addition, in the energy-oriented approach, not only the maximum effects of earthquakes are taken into account, but also the duration of the earthquake. In this respect, it can be said that the use of energy-oriented earthquake parameters is a more rational approach besides being an alternative. In this study, strength and energy-oriented approaches of earthquake parameters of 11 different periods of single degree of freedom systems were evaluated over 28 different earthquake situations. The energy spectra intended to be an alternative to the traditional acceleration spectra were created using the acceleration parameter equivalent to the input energy. Two new energy parameters, which take into account the effective duration of the earthquake, are proposed, and the relationship between the strength-oriented spectral acceleration parameters and the energy parameters used in the literature is examined by correlation study. According to the results obtained, it has been seen that energy oriented earthquake parameters, which give close values in similar period situations, will be a good alternative to strength oriented earthquake parameters. It was observed that the energy parameters were affected by the effective duration of the earthquake, unlike the strength-based parameters. It has been revealed that the newly proposed energy parameters considering the effective duration give good correlations. Finally, it was concluded that the energy parameters can be used in the design, and the newly proposed effective energy parameters can shorten the analysis durations.

Keywords

Acknowledgement

This paper was produced from the Ph.D. thesis study conducted in the Structural Engineering Ph.D. program of Istanbul Technical University.

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