اثر مدت دوام زلزله بر بیشینه تغییرمکان سازه تک درجه آزادی الاستوپلاستیک

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

محققین در مورد میزان تاثیرگذاری مدت دوام زلزله بر آسیب‌پذیری سازه‌ها وحدت نظر ندارند که عمده این اختلاف ناشی از در نظر گرفتن شاخص‌های خرابی متفاوت در این تحقیقات است. در این تحقیق بیشینه تغییرمکان سازه تحت تاثیر مدت دوام زلزله مورد بررسی قرار می‌گیرد. بدین منظور سازه‌های تک درجه آزاد با اثر پی- دلتا تحت جفت نگاشت‌های با مدت دوام طولانی و کوتاه دارای طیف معادل قرار می‌گیرد. در این تحقیق تعداد زیادی (بالغ بر 150000) تحلیل دینامیکی غیرخطی انجام شد که شامل تحلیل 41 سازه‌ با دوره‌های تناوب 1 تا 5 ثانیه با 2 ضریب رفتار مختلف و 7 حالت از شرایط بار ثقلی تحت 146 جفت نگاشت با طیف‌های پاسخ شتاب معادل می‌باشد. نتایج تحلیل‌ها نشان می‌دهد که در صورت عدم فروریزش سازه، ‌بیشینه تغییرمکان‌های سازه تحت نگاشت‌های با مدت دوام طولانی و کوتاه تفاوت چندانی ندارد. اما با ورود به شکل‌پذیری‌های بزرگ، میزان فروریزش سازه‌ها تحت نگاشت‌های با مدت دوام طولانی تا حدود 2 برابر بیشتر از جفت نگاشت‌های با مدت دوام کوتاه می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

The Influence of Ground Motion Duration on Maximum Displacement of Elasto-Plastic SDOFs

نویسندگان [English]

  • MohammadHossein Hajimohammadi
  • Horr Khosravi
  • Reza Dezvareh
Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran.
چکیده [English]

There is no Consensus among researchers about the influence of ground motion duration on the structural vulnerability. Most of disagreement is mainly due to considering different damage indices in different investigations. In this study, maximum displacement of structure due to ground motion duration is investigated. For this purpose, SDOF systems with P-Delta effect are subjected to spectrally matched record pairs. In the present study, a vast number of (more than 150000) nonlinear dynamic analysis is performed for SDOF models with 41 structural period from 1 to 5 second, 2 ductility reduction factor and 7 quantity of gravity load subjected to 146 spectrally matched ground motion pairs. The analysis results indicate that maximum displacement of structure under long duration and short duration records is almost equal, when no collapse has occurred. However, for large ductility demands, the number of collapse in ling duration ground motions is almost twice their short duration pairs.

کلیدواژه‌ها [English]

  • Ground Motion Duration
  • Spectrally Equivalent Records
  • Elasto-Plastic Behavior
  • Nonlinear Dynamic Analysis

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