Hysteretic Energy Demand in SDOF Structures Subjected to an Earthquake Excitation: Analytical and Empirical Results
| Autor: | Onur Merter, Taner Uçar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Damping ratio
0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Kinetic energy Physics::Geophysics 0201 civil engineering Seismic analysis lcsh:Agriculture lcsh:Technology (General) lcsh:Agriculture (General) Ductility Hysteretic energy Input energy NLTH analysis SDOF system Hysteretic energy to input energy ratio Earthquake ground motion Hysteretic energy Earthquake ground motion 021101 geological & geomatics engineering Physics Elastic energy lcsh:S Mechanics lcsh:S1-972 Nonlinear system lcsh:T1-995 Energy (signal processing) Excitation |
| Zdroj: | Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Vol 22, Iss 2, Pp 364-374 (2018) Volume: 22, Issue: 2 364-374 Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi |
| ISSN: | 1308-6529 |
| Popis: | In energy-based seismic design approach, earthquake ground motion is considered as an energy input to structures. The earthquake input energy is the total of energy components such as kinetic energy, damping energy, elastic strain energy and hysteretic energy, which contributes the most to structural damage. In literature, there are many empirical formulas based on the hysteretic model, damping ratio and ductility in order to estimate hysteretic energy, whereas they do not directly consider the ground motion characteristics. This paper uses nonlinear time history (NLTH) analysis for energy calculations and presents the distribution of earthquake input energy and hysteretic energy of single-degree-of-freedom (SDOF) systems over the ground motion duration. Seven real earthquakes recorded on the same soil profile and three different bilinear SDOF systems having constant ductility ratio and different natural periods are selected to perform NLTH analyses. As results of nonlinear dynamic analyses, input and hysteretic energies per unit masses are graphically obtained. The hysteretic energy to input energy ratio ( E H / E I ) is investigated, as well as the ratio of other energy components to energy input. E H / E I ratios of NLTH analysis are compared to the results of empirical approximations related E H / E I ratio and a reasonable agreement is observed. The average of E H / E I ratio is found to be between 0.468 and 0.488 meaning nearly half of the earthquake energy input is dissipated through the hysteretic behavior. |
| Databáze: | OpenAIRE |
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