تاثیر اندرکنش خاک و سازه بر پاسخ‌های لرزه‌ای طولی پل‌های معلق کنترل شده با میراگر بهینه جرمی تنظیم شونده

علیزاده, حامد; حسینی لواسانی, سیدحسین

doi:10.22065/jsce.2021.259712.2303

تاثیر اندرکنش خاک و سازه بر پاسخ‌های لرزه‌ای طولی پل‌های معلق کنترل شده با میراگر بهینه جرمی تنظیم شونده

نوع مقاله : علمی - پژوهشی

نویسندگان

گروه عمران/دانشکده فنی و مهندسی/دانشگاه خوارزمی

10.22065/jsce.2021.259712.2303

چکیده

پل‌های معلق به دلیل دارا بودن دهانه‌های بلند، برج‌های مرتفعی را در ساختار هندسی خود شامل می‌شوند. ارتعاع زیاد این برج‌ها باعث می‌شود تا در برابر بارهای دینامیکی، مانند تحریکات لرزه‌ای، پاسخ‌های جابه‌جایی قابل توجهی را تجربه کنند، که می‌توانند باعث بروز اختلال در عملکرد آنها شوند. برای فائق آمدن بر این مشکل، می‌توان از سیستم‌های کنترل کننده‌ی ارتعاشات، مانند میراگر جرمی تنظیم شونده که یک سیستم غیرفعال است، استفاده کرد. عملکرد این سیستم‌ها بر اساس شاخص‌های کارایی که بر حسب پاسخ‌های سازه تعریف می‌شوند، قابل بررسی هستند. از سوی دیگر، میراگرها برای اینکه بتوانند مطلوب‌ترین عملکرد خود را در کاهش ارتعاشات ارائه دهند، نیازمند این هستند که پارامترهای خود را به مقادیر بهینه سوق دهند؛ این مهم را می توان با استفاده از الگوریتم‌های بهینه-یابی فراابتکاری انجام داد. در این تحقیق، پاسخ‌های لرزه‌ای طولی جابه‌جایی و انرژی پل معلق گلدن گیت، با درنظر گرفتن اندرکنش خاک و سازه، با استفاده از میراگر جرمی تنظیم شونده که مشخصات آن با استفاده از الگوریتم فراابتکاری استاد-دانش‌آموز-معلم بهینه، و توسط شاخص‌های انرژی محور که تعریف شده‌اند، مورد بررسی قرار گرفت. نتایج حاکی از آن بود که با نرم شدن خاک بستر مود ابتدایی سازه نقش به مراتب مهمتری در پاسخ نهایی ایفا می‌کند. همچنین، میراگر جرمی تنظیم شونده بر اساس شاخص‌های انرژی تعریف شده، یک سیستم کنترلی کاملا موفق جهت کنترل ارتعاشات سیستم برج-شمع برای تمامی حالات خاک بستر در نظر گرفته شده، بود.

کلیدواژه‌ها

موضوعات

اندرکنش خاک و سازه

عنوان مقاله [English]

The effect of soil-structure interaction on longitudinal seismic responses of suspension bridges controlled by optimal TMD

نویسندگان [English]

Hamed Alizadeh
Seyed hossein hosseini lavassani

Civil engineering department/Engineering Faculty /Kharazmi university

چکیده [English]

Suspension bridges contain high towers due to having long span. Large height makes them to experience remarkable displacement responses against dynamic loading, like seismic excitation which disturbs their performance. In order to overcome this problem, control strategies, like tuned mass damper or in brief TMD as a passive system can be used. The performance of these systems can be addressed by the indices defined according to structural responses. On the other hand, its parameters should be adjusted to their optimum values to providing the best performance accessible by the meta heuristic algorithm. Here, the seismic displacement and energy responses of the Golden gate bridge considering soil-structure interaction were investigated using the optimum TMD optimized by observer teacher learner algorithm, and the performance of it was addressed by the energy indices. The results indicated that by increasing the softness of the bed soil the first mode plays the dominant role in the final response. Also, TMD was a successful system to control the vibration of the tower-pier system according to the defined energy indices for all the conditions of the bed soil considered. Suspension bridges contain high towers due to having long span. Large height makes them to experience remarkable displacement responses against dynamic loading, like seismic excitation which disturbs their performance. In order to overcome this problem, control strategies, like tuned mass damper or in brief TMD as a passive system can be used. The performance of these systems can be addressed by the indices defined according to structural responses.

کلیدواژه‌ها [English]

Suspension bridge
tuned mass damper
efficiency indicators
meta-heuristic algorithm
soil-structure interaction

مراجع

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