اثر طول مدت لرزه ای بر ضریب کاهش میرایی با استفاده از نظریه ارتعاش تصادفی
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اثر طول مدت لرزه ای بر ضریب کاهش میرایی با استفاده از نظریه ارتعاش تصادفی

عنوان فارسی مقاله: اثر طول مدت لرزه ای بر ضریب کاهش میرایی با استفاده از نظریه ارتعاش تصادفی
عنوان انگلیسی مقاله: Seismic duration effect on damping reduction factor using random vibration theory
مجله/کنفرانس: سازه های مهندسی - Engineering Structures
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: زلزله، سازه
کلمات کلیدی فارسی: مدت زمان زمین لرزه، ضریب کاهش میرایی، طیف پاسخ لرزه ای، فرآیند تصادفی، نظریه ارتعاش تصادفی
کلمات کلیدی انگلیسی: Ground motion duration، Damping reduction factor، Seismic response spectrum، Stochastic process، Random vibration theory
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journal List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engstruct.2018.10.074
دانشگاه: DICATECH, Department of Civil Engineering, Environmental, Territory, Building and Chemical, Technical University of Bari, Via Edoardo Orabona, 4, 70126 Bari, Italy
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 3/167 در سال 2017
شاخص H_index: 104 در سال 2019
شاخص SJR: 1/69 در سال 2017
شناسه ISSN: 0141-0296
شاخص Quartile (چارک): Q1 در سال 2017
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 14
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: بله
کد محصول: E11010
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Stochastic modelling of seismic motion


3- Definition of modulation function considering the earthquake duration


4- Evaluation of damping reduction factor by the peak theory


5- Analysis results


6- Proposed DRF formulation


7- Conclusion and further developments


References

نمونه متن انگلیسی مقاله

Abstract


Damping Reduction Factor plays a key role in scientific literature and Technical Codes, but till now existing formulations present differences and inconsistences probably because obtained by integration of real recorded events, thus sensible to specific used data. This paper investigates the relation between damping reduction factor and earthquake duration by means of random vibration theory. A stochastic process, that is non-stationary and filtered, is used to model a seismic event. The modulation function is suitably chosen to describe earthquakes characterized by different durations. The stochastic process peak theory allows to calculate damping reduction factor after the definition of the probabilistic response of a simple linear visco-elastic oscillator. The variability with seismic duration for different soil conditions and damping ratios is investigated. The study points out that damping reduction factor is more sensitive to seismic duration in the range of high period and on rigid soil with respect to other conditions. The results show that, if damping ratio or effective duration values are increased, the damping reduction factor value diminishes.


Introduction


Serious seismic damage observed on structures and infrastructures systems up to today [1] can be prevented by means of retrofitting interventions if the capacity of these systems and the seismic demand are properly evaluated [2–6] In structural seismic design, Damping Reduction Factor (DRF) represents an effective tool for design purposes to estimate the demand by response spectra characterized also by damping ratios different from 5% as in the case of structures equipped with passive energy dissipation or isolation systems. DRF modifies the values of the conventional elastic spectral response with damping ratio equal to 5% to the values corresponding to a different 7 damping level. It is defined as the ratio between the spectral ordinate at 5% conventional damping and the spectral ordinate at a different level of damping. DRF finds many applications to study the behavior of structures [7], especially for the ones equipped with passive energy dissipation or isolation systems [8–12]. In these situations, the DRF permits to estimate the variation of the structural response (displacements and forces) due to the high supplemental damping values [5,13–15] In addition, for inelastic structures, DRF allows to calculate the maximum displacement demand from the one of an equivalent linear system [8]. For these and other reasons the DRF is particularly suitable for the seismic design of a structure since it provides a practical evaluation of the reduction of earthquake loads for effects of structural, non-structural and supplementary energy dissipation systems. For that reason, it is selected as a key parameter in the present study.

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