اثر زلزله بر روی قاب فولادی با مهاربند کابلی و میراگر رئولوژی مغناطیسی

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
1 دانشجوی فارغ التحصیل دانشگاه تبریز
2 دانشگاه تبریز
چکیده
طراحی سازه­ های مقاوم در برابر زلزله و کاهش خسارت ­های ناشی از آن، همواره مورد توجه بوده است. یکی از روش ­های کاهش ارتعاشات زلزله در قاب­های فولادی، استفاده از مهاربند کابلی است. همچنین، از روش­ های بهبود رفتار سازه در برابر بارهای لرزه ­ای، استفاده از میراگرها است. در این پژوهش، میراگر رئولوژی مغناطیسی و مهاربند کابلی به­ صورت همزمان به ­کار برده شده است. برای بررسی کارآیی سیستم پیشنهادی، چهار قاب فولادی بدون کابل و میراگر، فولادی با مهاربند کابلی، فولادی با میراگر رئولوژی مغناطیسی و فولادی با مهاربند کابلی به همراه میراگر رئولوژی مغناطیسی که دارای یک دهانه و دو دهانه است، انتخاب شده است. رفتار این قاب­ ها با فرض شرایط مختلف، تحت بار جانبی استاتیکی غیرخطی و بارهای لرزه ­ای در نرم ­افزار SAP2000 بررسی شده است. با بررسی نتایج به ­دست آمده از تحلیل استاتیکی غیرخطی حالت یک دهانه، نتیجه می ­شود که قاب فولادی با مهاربند کابلی و میراگر رئولوژی مغناطیسی، تغییرمکان جانبی قاب و اغلب تلاش ­های داخلی تیر و ستون را بیشتر از سایر قاب­ ها کاهش می­ دهد. با بررسی نتایج تحلیل دینامیکی تاریخچه ­زمانی حالت یک دهانه و دو دهانه، نتیجه می­ شود که سیستم پیشنهادی در اکثر زلزله­ های بررسی شده، تغییرمکان جانبی قاب و تلاش­ های داخلی تیر و ستون را بیشتر از سایر قاب ­ها کاهش می ­دهد. به عبارت دیگر، استفاده از مهاربند پیشنهادی، سبب بهبود عملکرد سازه در برابر بارهای جانبی می­ شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Earthquake Effect on Steel Frame with Cable Bracing and Magnetorheological (MR) Damper

نویسندگان English

Mahdi Abbasi 1
Majid Barghian 2
1 University of Tabriz
2 University of Tabriz
چکیده English

The design of earthquake-resistant structures and the reduction of damages caused by them have always been considered. One of the ways to reduce earthquake vibrations in steel frames is to use cable braces. In addition, one of the ways to improve the behavior of the structure against seismic loads is the use of dampers. In this research, magnetorheological damper and cable brace are used simultaneously. To check the effectiveness of the proposed system, four steel frames including, a steel frame without cables and dampers, a steel frame with cable braces, a steel frame with magnetorheological dampers and, a steel frame with cable braces along with magnetorheological dampers, which have one-span and two spans, were selected and the behavior of this frame Assuming different conditions, under nonlinear static lateral load and seismic loads, it has been checked in SAP2000 software. By examining the results obtained from the nonlinear static analysis of the case of a one span, it is concluded that the steel frame with cable brace and magnetorheological damper reduces the lateral displacement of the frame and often the internal forces of the beam and column more than other frames. gives by examining the results of the time-history dynamic analysis of one-span and two-span conditions, it is concluded that the proposed system reduces the lateral displacement of the frame and the internal forces of the beam and column more than other frames in most of the investigated earthquakes. In other words, using the proposed systems improves the performance of the structure against lateral loads.


کلیدواژه‌ها English

Magnetorheological (MR) Damper
Cable Bracing
Steel frame
Seismic Load
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