ارزیابی تاثیر توالی لرزه‌ای بر خرابی خستگی کم چرخه در اتصالات قابهای خمشی فولادی بهینه‌سازی شده بر اساس عملکرد
محورهای موضوعی : آنالیز سازه - زلزله
1 - گروه مهندسی عمران، واحد گرمی، دانشگاه آزاد اسلامی، گرمی، ایران
کلید واژه: شاخص خرابی, خستگی کم چرخه, بهینه‌سازی عملکردی, توالی لرزه‌ای, هزینه عمر.,
چکیده مقاله :
هدف اصلی تحقیق حاضر، ارزیابی تاثیر توالی لرزه‌ای بر خرابی خستگی کم چرخه در اتصالات قابهای خمشی فولادی ویژه بهینه‌سازی شده بر اساس هزینه اولیه ساخت، و هزینه چرخه عمر در چهارچوب نگرش طراحی مبتنی بر عملکرد می‌باشد. بدین منظور بعد از فاز طراحی بهینه مبتنی بر عملکرد با استفاده از الگوریتم فراکاووشی مرکز جرم و در نظرگیری توابع هدف هزینه اولیه ساخت و هزینه چرخه عمر در روند بهینه‌سازی، در فاز نهایی، به ارزیابی خستگی کم‌چرخه در اتصالات، تحت توالی لرزه‌ای پرداخته شده است. در این تحقیق از نرم‌افزار OpenSees، جهت انجام مدلسازی و تحلیل‌های غیرخطی، و از نرم‌افزار Matlab، بمنظور بهینه‌سازی در چهارچوب عملکرد با توجه به ضوابط آئین‌نامه FEMA350، استفاده شده است. سه قاب خمشی فولادی 3، 6 و 12 طبقه مثال‌های عددی مورد بررسی در این مطالعه می‌باشند که تحت 12 شتاب‌نگاشت دارای توالی لرزه‌ای و زلزله اصلی، با استفاده از تحلیل تاریخچه زمانی، به بررسی شاخص خرابی خستگی در ناحیه اتصالات این قابها پرداخته شده است. با توجه به نتایج، سازه‌های بهینه‌سازی شده در چهارچوب مبتنی بر عملکرد با در نظرگیری تابع هدف هزینه چرخه عمر در روند بهینه‌سازی نسبت به سازه‌های بهینه با تابع هدف هزینه اولیه ساخت در قابهای 3، 6 و 12 طبقه به ترتیب منجر به کاهش 8%، 9% و 30%، شاخص خرابی کم چرخه در برابر زلزله‌های اصلی و کاهش 10%، 13% و27% در برابر توالی لرزه‌ای شده است.
The main objective of this study is to evaluate the effect of seismic sequence on low-cycle fatigue failure in specially optimized steel moment frame connections based on initial construction cost and life cycle cost in the framework of the performance-based design approach. For this purpose, after the performance-based optimal design phase using the center of mass meta-exploration algorithm and considering the objective functions of the initial construction cost and the life cycle cost in the optimization process, in the final phase, low-cycle fatigue evaluation in the joints has been done under seismic sequence. In this research, OpenSees software was used to perform nonlinear modeling and analysis, and Matlab software was used to optimize performance according to FEMA350 regulations. Three steel moment frames of 3, 6, and 12 floors are numerical examples investigated in this study, under 12 accelerograms with seismic sequence and main earthquake, using time history analysis, the fatigue failure index in the joints of these frames has been investigated. According to the results, the structures optimized in the performance-based framework by considering the objective function of the life cycle cost in the optimization process compared to the optimal structures with the objective function of the initial construction cost in 3, 6, and 12-story frames, respectively, lead to a reduction of 8%. 9% and 30%, low-cycle damage index against main earthquakes, and 10%, 13%, and 27% reduction against seismic sequence.
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