مقایسه ضرایب عملکرد لرزه‌ای مورد نیاز در سیستم قاب خمشی ویژه فولادی تحت تأثیر زلزله‌های حوزه دور با حوزه نزدیک

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

تفاوت رفتار سیستمهای مختلف سازه ای تحت زمین لرزه های ثبت شده در حوزه نزدیک، بررسی و بازنگری ضرایب طراحی لرزه ای این سیستمها را اجتناب ناپذیر نموده است. این مطالعه به ارزیابی «ضرایب عملکرد لرزه‌ای» قاب خمشی ویژه فولادی تحت زلزله های حوزه نزدیک می پردازد. در این راستا «مدل‌های نمونه‌ای» سه دهانه شامل سازه های 1،2،3،5،8 و 15طبقه با دهانه‌های 4 و 8متر برای منطقه‌ای با لرزه‌خیزی خیلی‌ زیاد طراحی و مدل می گردند. ابتدا با انجام آنالیزهای استاتیکی افزایشی ضرایب «اضافه مقاومت» و «شکل‌پذیری مبتنی بر پریود» تعیین شده و سپس با انجام آنالیزهای دینامیکی غیرخطی افزایشی تحت تاثیر زلزله‌ های حوزه دور، حوزه نزدیک بدون پالس و حوزه نزدیک باپالس، وضعیت عملکردی مدل‌ها مشخص و صحت ضریب رفتار ارزیابی می گردد.
نتایج نشان می‌دهند که به جز سازه‌های 15طبقه، «ضریب رفتار» و «ضریب اضافه مقاومت» سیستم، تحت تاثیر زلزله‌های حوزه دور مناسب می باشند ولی بهره‌گیری از همین ضرایب برای سازه‌های کوتاه‌پریود تحت زلزله‌های حوزه نزدیک باپالس‌ مناسب نبوده و برای نیل به اهداف عملکرد لرزه ای، بازنگری آن ضروری می باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Seismic Performance Factors of Special Moment Resisting Steel Frames Subjected to Far- and Near-Field Ground Motions

نویسندگان [English]

  • K. Mousavi Darzikolaei
  • T. Taghikhany
Faculty of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

Different and to some extent poor seismic performance of structural systems under various types of near-field earthquake excitation, made re-assess and re-evaluation of “seismic performance factors” used in building codes, an inevitable important task. In this paper, seismic performance of special moment resisting steel frame system (SMRSF) under near-Field (with and without pulse) and far-field record excitation is investigated through FEMA P695 methodology. In order to cover the “design space” of the selected structural system, archetypes consisted of 1, 2, 3, 5, 8 and 15 story buildings with 4 and 8 meters bay are selected and designed based on Iran’s national building codes for a “very high seismic” region. Corresponding non-linear models are built based on most recent advances in structural components modeling using OpenSees software. At first by performing non-linear static analysis, overstrength factor and period-based ductility are evaluated and quality of non-linear models is controlled. Afterwards, incremental dynamic analyses (IDA) are performed using far-field, near-field pulse like and non pulse like records. Finally, by using IDA results, “adjusted collapse margin ratio (ACMR)” of the models are calculated and compared to “allowable collapse margin ratio (ACMRallowable)”. Therefore, seismic performance of the models are evaluated and “response modification coefficient” (R) for the system is investigated and compared with this factor under different types of ground motion records. Results indicated that except for 15 story buildings, proposed “response modification coefficient” and “over-strength factor “for SMRSF system are adequate under far-field records. However under pulse like near field ground motions, it was observed that short period structures are to some extent vulnerable. For long period structures, in contrast with far-field records, seismic performance of structures designed by prescriptive provisions has adequate performance under near-field pulse like motions.

کلیدواژه‌ها [English]

  • Seismic Performance Factors
  • Near-Field Earthquake
  • Steel Special Moment Frame System
  • incremental dynamic analysis (IDA)
  • Nonlinear Static Analysis (Pushover Analysis)

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 50، شماره 1
فروردین و اردیبهشت 1397
صفحه 37-52

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