مجله علمی صوت و ارتعاش

مجله علمی صوت و ارتعاش

کنترل ارتعاشات لرزه‌ای سازه با رفتار غیرخطی به کمک میراگر جرمی و مغناطیسی با الگوریتم منطق فازی براساس سرعت و تغییرمکان

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد، مهندسی زلزله، دانشکده عمران، دانشگاه علم و صنعت ایران، تهران، ایران
2 دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران
چکیده
در این پژوهش تأثیر بکارگیری میراگرهای جرمی تنظیم‌شده بهینه غیرفعال و میراگر مغناطیسی نیمه‌فعال به صورت جداگانه و نیز با استفاده همزمان از میراگرها در کنترل ارتعاشات لرزه‌ای سیستم یک سازه 12 طبقه فولادی با درنظر گرفتن رفتار غیرخطی سازه مورد ارزیابی قرار گرفته است. برای مدل‌سازی سازه فولادی و میراگر جرمی تنظیم‌شده از نرم‌افزار اپنسیس[i] و جهت مدل‌سازی اثر میراگر مغناطیسی از نرم‌افزار متلب[ii] استفاده شده است. در نرم‌افزار متلب، ولتاژ مناسب کنترلی برای میراگر مغناطیسی با پیاده‌سازی منطق فازی با تصمیم‌گیری بر اساس سرعت و تغییرمکان تعیین می‌شود؛ سپس با حل معادله دینامیکی میراگر، نیروی آن محاسبه و اثر این نیرو روی مدل سازه 12 طبقه در نرم‌افزار اپنسیس وارد می‌شود. برای اتصال بین دو نرم‌افزار از شبکه TCP/IP به عنوان پُل ارتباطی استفاده شده است. تحلیل‌های دینامیکی افزایشی با استفاده از 7 رکورد زمین‌لرزه با بیشینه شتاب‌های g1/0 تا g1 با گام افزایشی g1/0 انجام شده است. براساس نتایج، الگوریتم منطق فازی با تولید ولتاژ مناسب کنترلی و ارسال آن به میراگر مغناطیسی موجب تطبیق بیشتر سیستم کنترلی ترکیبی میراگر جرمی و مغناطیسی با رفتار سازه شده است. در واقع سیستم‌ کنترلی ترکیبی علاوه بر کاهش حداکثر پاسخ سازه در پالس اصلی زلزله توانایی بیشتری برای کاهش پاسخ سازه تحت اثر پالس‌های ضعیف‌تر و در مجموع کاهش انرژی وارد شده به سازه در طول مدت زمان زمین‌لرزه دارد. سیستم کنترل ترکیبی میراگر جرمی و مغناطیسی پاسخ حداکثر تغییرمکان بام سازه را نسبت به حالت سیستم کنترلی غیرفعال با میراگر جرمی تنظیم‌شده 23 درصد بهبود داده است. این نتایج برای حداکثر برش پایه سازه برابر 9/27 می‌باشد. درصد بهبود مقادیر پراکندگی پاسخ تغییرمکان بام و برش پایه در سیستم‌های مذکور به ترتیب برابر 1/22 و 9/25 درصد می‌باشد.
 
[i] OpenSEES
[ii] MATLAB


 


 

 
 
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Control of seismic vibrations of a structure with nonlinear behavior using tuned mass and magnetorheological dampers with fuzzy logic algorithm based on velocity and displacement

نویسندگان English

Sasan Mostaghimi Tehrani 1
Akbar Bathaei 2
Seyed Mehdi Zahrai 2
1 M.Sc., Earthquake Engineering, School of civil engineering, Iran University of Science and Technology, Tehran, Iran
2 School of Civil Engineering, University of Tehran, Tehran, Iran
چکیده English

In this study, the effect of using passive optimized tuned mass dampers and semi-active magnetorheological dampers separately and simultaneously in controlling the seismic vibrations of a steel structure has been evaluated, considering nonlinear behavior of the structure. The OpenSees software is used to model the steel structure and tuned mass damper, and MATLAB software is used to model the effect of the magnetorheological damper. In the MATLAB software, the appropriate control voltage for the magnetorheological damper is determined by implementing fuzzy logic with decisions based on velocity and displacement. The TCP/IP network is used as a communication bridge to connect the two softwares. Incremental dynamic analyses were performed using 7 earthquakes. Based on the results, the fuzzy logic algorithm has resulted in a better adaptation of the combined system of mass and magnetorheological dampers with the behavior of the structure. In fact, the combined control system, in addition to reducing the maximum response of the structure under the main pulse of the earthquake, has a great ability to reduce the response of the structure under the effect of weaker pulses. The combined mass and magnetorheological dampers control system has improved the maximum roof displacement of the structure by 23 percent compared to the passive control system with the tuned mass damper. The result for the maximum base shear of the structure is 27.9. The percentage of improvement in the dispersion values of the roof displacement and base shear in the aforementioned systems is 22.1 and 25.9, respectively.

کلیدواژه‌ها English

Steel structure
Tuned mass damper
Magnetorheological damper
Fuzzy logic algorithm
Incremental dynamic analysis
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