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The Comparison of the IDA and ET on Steel Structures Rehabilitated by Isolators | ||
| Journal of Rehabilitation in Civil Engineering | ||
| مقاله 6، دوره 2، شماره 2 - شماره پیاپی 4، آبان 2014، صفحه 46-62 اصل مقاله (850.74 K) | ||
| شناسه دیجیتال (DOI): 10.22075/jrce.2014.208 | ||
| نویسندگان | ||
| Hamed Arshadi* 1؛ Ramezan Ali Izadifard1؛ Homayun Estekanchi2 | ||
| 1Department of Civil Engineering, Imam Khomeini International University, Qazvin, Iran | ||
| 2Department of Civil Engineering, Sharif University of Technology, Tehran, Iran | ||
| تاریخ دریافت: 13 فروردین 1393، تاریخ بازنگری: 08 مهر 1393، تاریخ پذیرش: 30 مهر 1393 | ||
| چکیده | ||
| Endurance time (ET) method is a relatively new performance-based earthquake method for structural evaluation and design. In this method, the structure is subjected to a gradually intensifying accelorogram(s) and its performance is assessed based on the maximum time duration that it can meet the specified performance objectives. Using moment-resisting and braced frames which are rehabilitated by base isolators; it is shown that ET can estimate results of the Incremental dynamic analysis (IDA) with acceptable accuracy. Spectral acceleration has been considered as the intensity measure. While the IDA would require several nonlinear dynamic analyses under multiple suitably scaled ground motion records, the ET can practically estimate the seismic behavior of simple to complex systems only by few nonlinear time history analyses. Moreover, it is shown that even in intense ground motions, super structures do not show considerable nonlinear behaviors and interstory drifts, because of energy dissipating by base isolation. The results also show that the ET method has the benefits of both time history analysis and the simplicity of the nonlinear static methods and can potentially be a useful tool for evaluation and designing seismic-resistant structures. | ||
| کلیدواژه‌ها | ||
| Nonlinear analyses؛ Incremental dynamic analysis Endurance time method؛ Seismic Rehabilitation؛ base isolation | ||
| مراجع | ||
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[1] Estekanchi, H. E. (2012), The Manual of The Endurance Time Method, (The 3rd edition), Faculty of civil engineering, Sharif University of Technology, Tehran, Iran. [2] Riahi, H. T. and Esekanchi, H. E. (2010), “Seismic assessment of steel frames with the endurance time method”, Journal of Constructional Steel Research, 66, 780-792. [3] Estekanchi, H. E., Valamanesh, v. and Vafai, A. (2007), “Application of endurance time method in linear seismic analysis”, Engineering Structures, 29, 2551-2562. [4] Izadifard, R. A., Arshadi, H. and Estekanchi, H. E., (2013) “The comparison between the incremental dynamic analysis and endurance time method on steel structures which are rehabilitated by base isolators” (M.Sc. Dissertation), International Imam Khomeini University of Qazvin, Qazvin. [5] Estekanchi, H. E., Arjomandi, k. and Vafai, A. (2008), “Estimating structural damage of steel moment frames by endurance time method”. Journal of Constructional steel Research, 64, 145-155. [6] FEMA-356(2000), Prestandard and commentary for the seismic rehabilitation of buildings, California, Redwood City. [7] Sayani, P. J. and Ryan K. L. (2009), “Comparative evaluation of fixed-base and base-isolated buildings using a comprehensive response index”, J. Struct. Eng. – ASCE, 135(6), 698-707. [8] Sayani, P. J. and Ryan K. L. (2009), “Evaluation of approaches to characterize seismic isolation for design”, J. Earthq. Eng.,13(6), 835-851. [9] Guideline for design and practice of base-isolation systems in buildings No. 523 (Office of deputy for strategic supervision bureau of technical execution system (2007), Tehran, Iran [10] FEMA 440(Federal emergency management agency) IMPROVEMENT OF NONLINEAR STATIC SEISMIC ANALYSIS PROCEDURES, Applied Technology Council. | ||
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