ارزیابی دقت تحلیل استاتیکی غیرخطی بهنگام شونده براساس جابجایی در مقایسه با روش FEMA356 در برآورد تقاضاهای لرزه‌ای قاب‌های خمشی فولادی با نامنظمی هندسی در ارتفاع

نوع مقاله : مقاله پژوهشی

نویسندگان

1 بخش مهندسی راه، ساختمان و محیط زیست، دانشگاه شیراز، شیراز، ایران

2 گروه مهندسی عمران، دانشکده‌ی فنی و مهندسی، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران

چکیده

در نتیجه تمایل حرفه مهندسی سازه برای حرکت به سمت طراحی بر اساس عملکرد، برآورد تقاضاهای لرز هایِ سازه، اهمیت تازه ای بدست آورده است. از این رو در سال های اخیر، روش‌های تحلیل استاتیکی غیرخطیِ معادلِ متعددی برای تخمین نیازهای لرزه ای سازه ها ارائه شده است؛ اما تعدادِ پژوهش‌هایی که توسط پژوهشگران مستقل برای بررسی دقت و کفایت این روش ها رهبری شده، بسیار اندک است. بنابراین هدایت پژوهش‌هایی جامع برای شناسایی محدودیت‌ها و کاستی های احتمالی این روش‌ها و مقایسه کارآیی آن ها نسبت به یکدیگر، ضروری است. در این مقاله، دقت یک روش پیشرفته تحلیل استاتیکی غیرخطی معادل در مقایسه با روش شناخته شده FEMA356 در برآورد تقاضاهای لرزه‌ای قاب‌های خمشی فولادی کوتاه مرتبه با نامنظمی هندسی در ارتفاع، مورد ارزیابی قرار گرفته است. روش مذکور، تحلیل استاتیکی غیرخطی بهنگام شونده براساس جابه جایی ترکیب شده با روش طیف ظرفیت FEMA440 است؛ که به اختصار روش CSM-DAP نامیده می‌شود. روش های – CSM  DAP  و FEMA356 بر روی یک نمونه آماری متشکل از 44 قاب خمشی 5 طبقه که تحت اثر 14 شتابنگاشت زلزله دور از گسل قرار گرفته‌اند، اعمال شده و نتایج حاصل از آن ها با نتایج حاصل از تحلیل دینامیکی غیرخطی به عنوان جواب صحیح، مقایسه گردیده است. این نمونه آماری، دامنه گسترده ای از نامنظمی هندسی در ارتفاع را برای سازه های کوتاه مرتبه پوشش می‌د‌هد. پاسخ‌های لرزه‌ایِ مورد بررسی در این پژوهش، جابه جایی بام، دریفت نسبی طبقه و برش پایه می‌باشند. نظر به حجم محاسبات روش CSM-DAP و نتایج این پژوهش مشاهده شد که برای قاب‌های کوتاه مرتبه، این روش مزیت چندانی نسبت به روش FEMA356 برای برآورد تقاضاهای لرزه‌ای ندارد .

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Accuracy Investigation of CSM-DAP Method in Comparison with FEMA356 Method for Estimating Seismic Demands of Steel Moment Resisting Frames with Geometric Irregularity in Elevation

نویسندگان [English]

  • Mojtaba Karimi 1
  • Mahmoud-Reza Banan 1
  • Ashkan Sharifi 2
1 Civil and Environmental Engineering Dept., Shiraz University, Shiraz, Iran
2 Department of Civil Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
چکیده [English]

Estimating seismic demands of structures has acquired renewed importance as a result of recent interests in performance-based seismic design. Consequently, in recent years, different equivalent nonlinear static analysis procedures have been developed to estimate structural seismic demands. However, just a few studies have been conducted to examine the accuracy and adequacy of these developed methods. Thus, it is necessary to conduct thorough investigations of these methods’ limitations, possible shortcomings, and their performance. In this paper, the accuracy of the CSM-DAP method in comparison with the FEMA356 method was evaluated for estimating seismic demands of low- rise steel moment resisting frames with geometric irregularity in elevation. The CSM-DAP method is an equivalent displacement-based adaptive nonlinear static analysis method combined with the FEMA440 capacity spectrum method. The CSM-DAP and FEMA356 methods were used to analyze 44 five-story moment-resisting frames subjected to 14 far-field earthquake ground motions and their results were compared with the results of nonlinear dynamic analyses. The selected sample includes a wide range  of geometric irregularities in elevation for low-rise structures. The estimated demand responses were namely roof displacement, inter-story drift ratio, and base shear. This study showed that considering the CSM-DAP computational effort, this method did not present significant advantages with respect to the FEMA356 method at least for low-rise structures with geometric irregularity in elevation.

کلیدواژه‌ها [English]

  • Equivalent Displacement-Based Adaptive Nonlinear Static Analysis
  • Capacity Spectrum Method of FEMA440
  • FEMA356 Nonlinear Static Analysis Method
  • Geometric Irregularity in Elevation
  • Seismic Demands

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نشریه مهندسی عمران امیرکبیر
دوره 52، شماره 1
فروردین 1399
صفحه 3-20

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