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روش سه مرحله ای انتخاب شتابنگاشت های زلزله برای تحلیل دینامیکی سازه ها | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 12، دوره 49، شماره 1، خرداد 1396، صفحه 127-138 اصل مقاله (816.21 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2016.603 | ||
| نویسندگان | ||
| فرهاد بهنام فر* 1؛ محمد نورائی2؛ مهدی طالبی ولنی3 | ||
| 1داتشکده عمران، دانشگاه صنعتی اصفهان، اصفهان، ایران | ||
| 2کارشناس ارشد مهندسی زلزله، اصفهان، ایران | ||
| 3کارشناس ارشد مهندسی سازه، اصفهان، ایران | ||
| چکیده | ||
| تحلیل دینامیکی خطی و غیر خطی سازه ها با استفاده از شتابنگاشت های زلزله، روشی مرسوم در تحقیقات مهندسی زلزله و نیز در طراحی سازه های مهم می باشد. امروزه آیین نامه های زلزله لازم می دارند که شتابنگاشت ها اولا"سازگار بوده و ثانیا" به مقیاس در آیند. برای سازگاری شتابنگاشت ها معیارهایی همچون مشابهت ساز و کار کانونی و بزرگا، فاصله های مشابه از مرکز زلزله و بالاخره یکسان بودن نوع خاک محل ثبت زلزله عنوان شده است. در این مقاله یک روند غربالگری سه مرحله ای ارائه شده که در طی آن تعداد رکورد های منتخب به سرعت کاهش داده می شود. رکورد های نهایی از نظر معیارهای ارائه شده مناسب ترین شتابنگاشت ها برای سازه مورد نظر می باشند. استفاده از این روش نسبت به روشهای موجود به کاهش بیشتر پراکندگی پاسخ های تحلیل غیرخطی سازه منجر خواهد شد و با کاهش پراکندگی، میزان اعتماد به ایمنی سازه طراحی شده بیشتر خواهد بود. | ||
| کلیدواژهها | ||
| انتخاب حرکات زمین؛ تحلیل تاریخچه زمانی؛ پراکندگی پاسخها؛ روند غربالگری؛ سازه ها | ||
| موضوعات | ||
| مهندسی زلزله | ||
| عنوان مقاله [English] | ||
| A 3-stage Method for Selection of Ground Motion for Dynamic Time History Analysis | ||
| نویسندگان [English] | ||
| F. Behnamfar1؛ M. Nooraei2؛ M. Talebi3 | ||
| 1Department of Civil Engineering, Isfahan University of Technology, Esfahan, Iran | ||
| 2Senior Earthquake Engineer, Consultant Engineers, Esfahan, Iran | ||
| 3Senior Structural Engineer, Consultant Engineers, Chaloos, Iran | ||
| چکیده [English] | ||
| Results of any dynamic analysis are clearly influenced by the type of the selected acceleration records as the use of inappropriate records can lead to a misunderstanding of the real behavior of structures against earthquakes. For compatibility of accelerograms various criteria including similarity of focal mechanism and magnitude, the same distance from the epicenter, and finally the same soil type of recording stations has been mentioned. Even with respect to these criteria, referencing to databases of earthquakes results in finding several hundreds and sometimes several thousands of apparently suitable accelerograms. Additional measures should be considered to minimize the number of appropriate records. In this paper a three-step screening process is presented during which the number of selected records is quickly reduced from a few thousands to a few number. The finally selected records are the most appropriate for the studied structure regarding the chosen requirements. In the first stage, called the coarse sieve, ground motion parameters and geological parameters are used to select the records. In the second stage, known as the intermediate sieve, a suit of earthquake records that are more similar in terms of spectral parameters are extracted and in the third and last stage, known as the fine sieve, the final records are selected with studying the spectral shapes of the records. It is shown that the proposed selection method results in a much less scatter in the nonlinear structural responses among the selected earthquakes resulting in an enhanced confidence in the safety of the designed structure. | ||
| کلیدواژهها [English] | ||
| ground motion selection, Nonlinear Time History Analysis, scatter, screening process, structures | ||
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| مراجع | ||
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[1] Seismic Design Code of Buildings 2800, Building and Housing Research Center, 3rd Edition, 2005. [2] ASCE Standard ASCE/SEI 7-10, Minimum Design Loads for Buildings and other Structures, American Society of Civil Engineers, 2010. [3] Pacific Earthquake Engineering Research Center (PEER), Evaluation of Ground Motion Selection and Modification Methods: Predicting Median Interstory Drift Response of Buildings, 2009. [4] J. W., Baker; C. A., Cornell; Spectral Shape, Epsilon and Record Selection, Earthq. Engng. and Structural Dynamics, Vol. 35, No. 9, pp. 1077-1095, 2006. [5] P., Tothong; A., Cornell; Structural Performance Assessment under Near-source Pulse-like Ground Motions Using Advanced Ground Motion Intensity Measures, Earthq. Eng. Struct. Dyn., Vol. 37, pp. 1013-1037, 2009. [6] I., Iervolino; C., Galasso; E., Cosenza; REXEL:Computer Aided Record Selection for Code-based Seismic Structural Analysis, Bulletin of Earthquake Engineering, Vol. 8, pp. 339-362, 2010. [7] Internet Site for European Strong-motion Data: http://www.isesd.cv.ic.ac.uk/ [8] J. W., Baker; Conditional Mean Spectrum: A Tool for Ground Motion Selection, Journal of Structural Engineering, Vol. 137, No. 3, pp. 322-331, 2011. [9] J. W., Baker; C. A., Cornell; A Vector-valued Ground Motion Intensity Measure Consisting of Spectral Acceleration and Epsilon, Earthquake Engineering & Structural Dynamics, Vol. 34, No. 10, pp. 1193-1217,2005. [10] N. N., Ambraseys; J., Douglas; D., Rinaldis; C., Berge-Thierry; P., Suhadolc; G., Costa; R., Sigbjornsson; P.,Smit; Dissemination of European Strong-motion Data,Vol. 2, CD-ROM Collection, Engineering and Physical Sciences Research Council, UK, 2004. [11] N., Luco; A., Cornell; Structure Specific Scalar Intensity Measures for Near-source and Ordinary Earthquake Ground Motions, Earthquake Spectra 2007, Vol. 23, No.2, pp. 357-392, 2007. [12] F., Behnamfar; A., Khodaparast; A., Bahmanzad; Providing a Method to Scale the Accelerograms for Nonlinear Dynamic Analysis and Comparison with Standard 2800 Method, The 4th National Conference on Regulations for Seismic Design of Buildings, 2010. [13] F., Behnamfar; A., Nafarie; A Method for Scaling the Strong Ground Motion in Performance-based Design, The 1st National Conference on Civil Engineering, Sharif University of Technology, 2004. [14] H., Moghadam; Earthquake Engineering, Farahang Publications, 2002. [15] G. W., Housner; Intensity of Ground Motion During Strong Earthquakes, Office of Naval Research Report, pp. 1-60, August 1952; http://resolver.caltech.edu/ CaltechEERL:1952.EERL.1952.001/ | ||
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