مطالعه اثرات جهت‌داری در رفتار لرزه‌ای اسکلت‌های ترکیبی دارای پیکربندی مهاربندی واگرا با دستک سخت کننده

کیایی نژاد, سعید; مشکوه الدینی, افشین; معصومی, علی

doi:10.22065/jsce.2018.117309.1447

مطالعه اثرات جهت‌داری در رفتار لرزه‌ای اسکلت‌های ترکیبی دارای پیکربندی مهاربندی واگرا با دستک سخت کننده

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد - مهندسی زلزله

² هیات علمی (استادیار)، دانشکده مهندسی ، گروه عمران، دانشگاه خوارزمی، تهران

³ ریاست دانشکده مهندسی - دانشگاه خوارزمی دانشکده مهندسی عمران

10.22065/jsce.2018.117309.1447

چکیده

اسکلت دوگانه فولادی، یکی از سیستم‌های سازه‌ای کاربردی برای مقابله با نیروهای جانبی ناشی از زلزله‌ها بوده که علاوه بر شکل‌پذیری مطلوب، دارای سختی، پایداری دینامیکی و درجه نامعینی بالا نیز می‌باشد. ساختار رفتاری سیستم‌های مقاوم دوگانه بر اساس دو مود عملکرد خمشی و برشی تشکیل می‌گردد. این پژوهش شامل یک مطالعه بر روی رفتار لرزه ای غیرخطی اسکلت دوگانه مقاوم حاوی قاب های صلب و پانل ‌های مهاربندی واگرا با دستک‌های سخت‌کننده است. میزان تاثیرگذاری وجود المان‌های مذکور بر اساس انجام تحلیل-های تاریخچه زمانی غیرخطی تحت رکوردهای نیرومند سه مؤلفه ای ارزیابی گردیده است. یک رکورد پر قدرت حوزه نزدیک دارای خصوصیات ویژه‌ای است. وجود پالس‌های پر دامنه و با پریود بلند در بازه زمانی جنبش های نیرومند زمین، تجمع شدید انرژی جنبشی و آزاد شدن آن در یک مدت کوتاه از عمده تفاوت‌ها نسـبت به رکوردهای ثبت شده در حوزه دور از گسـل اسـت. نگرش ویژه این پژوهش در ارزیابی دامنه تغییرات بیشینه پاسخ و همچنین تاریخچه زمانی پارامترهای تغییرمکان نسبی، شتاب مطلق و سرعت نسبی طبقات و برش پایه سازه مطالعاتی می‌باشد. بررسی نتایج نشان دهنده نمود اثرات مشخص حاصل از پالس‌های بزرگ و پیوسته سرعت موجود در تاریخچه زمانی رکوردهای حوزه نزدیک بر تغییرمکان جانبی نسبی طبقات، همراه با ایجاد و گسترش سریع مکانیزم مفاصل پلاستیک در المان های اصلی اسکلت مقاوم دوگانه می‌باشد.

کلیدواژه‌ها

موضوعات

مهندسی سازه و زلزله

عنوان مقاله [English]

Study on the effects of rupture directivity on seismic behaviour of hybrid skeletal systems of eccentrically braced frames with knee rods

نویسندگان [English]

Saeed Kiaeinejad ¹
Afshin Meshkat-Dini ²
Ali Massumi ³

¹ MSc Student - Earthquake Engineering

² Assistant Professor of Structural-Earthquake Engineering - Kharazmi University - Tehran - IRAN

³ Professor, Faculty of Engineering, Kharazmi University, Tehran

چکیده [English]

The dual steel resistant skeleton is one of the functional structural systems for resisting against lateral forces induced by earthquakes that in addition to the enhanced ductility possesses high stiffness, dynamic stability, and redundancy. Behavioural pattern of dual resisting systems is based on shear and bending performance modes. This research includes a study on the nonlinear seismic behaviour of dual eccentrically braced resisting frames with knee rods. The extent of the effectiveness of knee bracing has been assessed based on nonlinear time history analyses of the structure subjected to severe three-component earthquake records. A strong near-field ground motion possesses particular characteristics. The existence of high amplitude and long period pulses in recorded strong ground motions along with the severe accumulation of kinetic energy and its short release time, are of noticeable differences between near-field and far-field earthquake records. The particular objective of this research is to evaluate the amplitude of variations in maximum responses and to determine the time history of absolute acceleration, relative displacement, and relative velocity of floors along with the base shear of the studied models. Analysing the results indicate an observable appearance of the effects of large coherent velocity pulses presented in the time history of near-field earthquake records, on the relative lateral displacement of floors and on the rapid propagation of plastic hinge mechanism throughout the primary elements of dual resistant skeleton.

کلیدواژه‌ها [English]

Seismic Behaviour
Dual Resistant System
Eccentrically Braced Panel
Knee Rods
Near-field Zone
Velocity Pulse

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