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

مهندسی عمران فردوسی

مقاله 12، دوره 35، شماره 1 - شماره پیاپی 37، خرداد 1401، صفحه 75-88   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2022.73042.1072

نویسندگان

محمدحسین حاجی محمدی¹؛ حر خسروی^{* 2}؛ رضا دزواره²

¹دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

²دانشکده 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

مدت داوم زلزله؛ جفت نگاشت‌های معادل طیفی؛ رفتار الاستوپلاستیک؛ تحلیل دینامیکی غیرخطی

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