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طراحی میراگر جرمی تنظیم شده ی نیمه فعال با سختی متغیر برای سازههای غیرخطی | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 13، دوره 49، شماره 2، مرداد 1396، صفحه 347-362 اصل مقاله (784.97 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2016.704 | ||
| نویسندگان | ||
| محتشم محبی* ؛ سینا بخشی نژاد | ||
| دانشگاه محقق اردبیلی، گروه مهندسی عمران، اردبیل، ایران | ||
| چکیده | ||
| در این مقاله به طراحی مکانیزم میراگر جرمی تنظیم شدهی نیمهفعال با سختی متغیر برای کاهش پاسخ سازههای غیرخطی تحت اثر زلزله پرداخته شده است. تنظیم پارامتر سختی در هر لحظه، بر اساس دو الگوریتم کنترلی نیمهفعال توسعه یافتهی متناسب با رفتار سازههای غیرخطی شامل 1) کنترل بهینهی آنی و قانون کنترل برشی و 2) کنترل بالانس اصلاح شده صورت گرفته است. برای تعیین مقادیر بهینهی پارامترهای سیستم کنترل نیمهفعال (شامل ماتریسهای وزنی در تابع عملکرد الگوریتم کنترل نیمهفعال و مقادیر حداقل و حداکثر سختی) یک مسئلهی بهینهسازی با تابع هدف حداقل کردن حداکثر تغییر مکان جانبی نسبی سازه تعریف و با استفاده از الگوریتم ژنتیک حل شده است. برای آنالیز عددی یک قاب ساختمانی هشت طبقهی برشی با رفتار دوخطی هیسترسیس انتخاب و به طراحی مکانیزم کنترل نیمهفعال تحت اثر اغتشاش سفید پرداخته شده است. نتایج بررسیها نشان میدهد که مکانیزم کنترل نیمهفعال طراحی شده بر اساس دو الگوریتمهای کنترلی، عملکرد مشابه و مناسبی در کاهش حداکثر تغییر مکان جانبی نسبی سازههای غیرخطی داشته است. همچنین بررسی کارایی میراگر جرمی نیمهفعال با سختی متغیر تحت ارتعاش طراجی و تحریکات لرزهای با محتوای فرکانسی متفاوت نشان میدهد که این مکانیزم در کاهش پاسخ سازه با رفتار غیرخطی، موثرتر از سیستم غیرفعال و نیمهفعال با میرایی متغیر میباشد. | ||
| کلیدواژهها | ||
| میراگر جرمی تنظیم شده ی نیمه فعال با سختی متغیر؛ سازههای غیرخطی؛ الگوریتم کنترلی بهینه ی برشی؛ الگوریتم کنترلی تعادل اصلاح شده؛ الگوریتم ژنتیک | ||
| موضوعات | ||
| کنترل سازه | ||
| عنوان مقاله [English] | ||
| Designing Variable Stiffness Semi-Active Tuned Mass Damper for Nonlinear Structures | ||
| نویسندگان [English] | ||
| M. Mohebbi؛ S. Bakhshinezhad | ||
| Engineering Department , University of Mohaghegh Ardabili, Ardabil, Iran | ||
| چکیده [English] | ||
| In this paper, designing variable stiffness semi-active tuned mass damper (SATMD) for mitigating the responses of nonlinear structures under earthquake excitation has been studied. Two semiactive control algorithms based on instantaneous optimal control and clipping control concept as well as modified balance control have been developed to determine the optimal stiffness of SATMD for nonlinear structures in each time step. For determining optimal parameters of semi-active control system including the weighting matrices in performance index of control algorithm as well as the maximum and minimum values of SATMD stiffness, an optimization problem for minimization of structure maximum response has been defined where genetic algorithm (GA) has been used for optimization. For numerical simulations, an eight-story nonlinear shear building with bilinear hysteresis behavior has been subjected to a white noise excitation and optimal SATMDs have been designed. The results showed that optimal variable stiffness SATMD using both control algorithms has been effective in suppressing the seismic responses of nonlinear structure. Also, variable stiffness SATMD shows better performance than TMD and variable damping SATMD in structural response controlling. Comparing the performance of the variable stiffness SATMD under testing earthquakes which were different from design record, showed that the efficiency of SATMD depends on the characteristics of excitation, hence design record needs to be chosen properly. | ||
| کلیدواژهها [English] | ||
| Variable stiffness semi-active tuned, mass damper, Non-linear structures, Semi-Active Control, Clipped optimal control algorithm, Modified balance control algorithm | ||
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