مهندسی سازه و ساخت

مهندسی سازه و ساخت

تاثیر جداساز آونگ اصطکاکی تک قوسی بر عملکرد لرزه‌ای قاب‌های دایاگرید فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
2 استاد، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
3 استادیار، گروه مهندسی عمران، واحد آیت الله آملی، دانشگاه آزاد اسلامی، آمل، ایران
چکیده
در سال‌های اخیر، سیستم سازه‌ای نوینی تحت عنوان دایاگرید معرفی شده است که به‌وسیله شبکه‌ای از اعضای قطری در پیرامون سازه تشکیل ‏می‌شود. این سیستم سازه‌ای شکل‌پذیری پایینی داشته و به دلیل سختی بالا و زمان تناوب کم، نیروی زلزله ورودی به این سازه‌ها زیاد می‌باشد. ‏بنابراین تلاش برای بهبود عملکرد لرزه‌ای این سیستم‌های سازه‌ای ضروری به نظر می‌رسد. در این پژوهش به تأثیر جداسازی پایه بر عملکرد ‏لرزه‌ای قاب‌های دایاگرید فولادی با اضافه کردن جداساز آونگ اصطکاکی تک‌قوسی پرداخته شده است. برای این منظور، ابتدا در نرم‌افزار ‏ETABS‏ قاب‌های 6 و 12 طبقه با سیستم دایاگرید تحت سه زاویه 58، 73 و 78 درجه بدون جداساز براساس آیین‌نامه‌های ‏ASCE 7-22‎‏ و ‏AISC360-16‎‏ طراحی و تحلیل گردیدند. سپس برای انجام تحلیل‌های دینامیکی تاریخچه‌زمانی غیرخطی، این قاب‌ها در نرم‌افزار ‏OpenSees‏ به ‏صورت دو بعدی با حالت بدون استفاده از جداساز و بار دیگر با منظور نمودن جداساز مدل‌سازی شدند. برای انجام این تحلیل‌ها 11 جفت ‏رکورد زلزله حوزه دور براساس نشریه‎ FEMA P695‎‏ و در سطح خطر زلزله ‏MCE‏ مورد استفاده قرار گرفتند. از خروجی‌های برنامه پارامترهای ‏مورد نظر شامل نسبت دریفت طبقات، شتاب طبقات، برش پایه و تغییرمکان جداساز برداشت گردید. نتایج نشان دادند که استفاده از جداساز ‏لرزه‌ای باعث بهبود عملکرد لرزه‌ای قاب‌های دایاگرید می‌شود و از طرفی با بررسی نسبت دریفت طبقات، مشاهده شد که با اضافه نمودن ‏جداساز لرزه‌ای به قاب‌های بدون جداساز نسبت دریفت طبقات در قاب 6 طبقه به‌طور میانگین حدود 9/73 درصد و در قاب 12 طبقه به‌طور ‏میانگین 64/75 درصد کاهش یافت، به این ترتیب سازه‌های دایاگرید از ناحیه فروریزش تحت زلزله ‏MCE‏ فاصله می‌گیرند و از فروریزش ‏سازه‌ها جلوگیری می‌شود.‏
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of a Single Friction Pendulum Isolator on the Seismic Performance ‎of Steel Diagrid Frames

نویسندگان English

Aref Hasanzadeh 1
Mehdi Dehestani 2
Ali Seyedkazemi 3
1 M.S Student, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Professor, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
3 Assistant Professor, Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University, ,Amol, Iran
چکیده English

In recent years, a novel structural system known as the diagrid has ‎been introduced, which is formed by a network of diagonal members ‎surrounding the structure. This structural system exhibits low ductility ‎and, due to its high stiffness and short period, experiences significant ‎earthquake forces. Consequently, efforts to improve the seismic ‎performance of these structural systems seem essential. This study ‎investigates the impact of base isolation on the seismic performance ‎of steel diagrid frames by incorporating a single friction pendulum ‎isolator. To this end, 6-story and 12-story diagrid frames were ‎initially designed and analyzed in the ETABS software without ‎isolators, following the ASCE 7-22 and AISC360-16 standards, under ‎three angles of 58, 73, and 78 degrees. Subsequently, for nonlinear ‎time-history dynamic analyses, these frames were modeled in ‎OpenSees software both with and without the isolator, in a two-‎dimensional framework. For the analyses, 11 pairs of far-field ‎earthquake records based on FEMA P695 guidelines were used at a ‎Maximum Considered Earthquake (MCE) hazard level. Output ‎parameters including inter-story drift ratios, floor accelerations, base ‎shear, and isolator displacements, were extracted from the program. ‎The results demonstrated that the use of seismic isolation significantly ‎enhances the seismic performance of diagrid frames. Additionally, the ‎analysis of inter-story drift ratios revealed that by adding the seismic ‎isolator to the non-isolated frames, the drift ratio of the 6-story frame ‎decreased by approximately 73.9% on average, and the drift ratio of ‎the 12-story frame decreased by approximately 75.4% on average. ‎Thus, diagrid structures are less likely to collapse under MCE seismic ‎events, effectively preventing structural failure.preventing structural ‎collapse.‎

کلیدواژه‌ها English

Steel Diagrid Frames؛ Nonlinear Time-history &lrm
Dynamic Analysis؛ Base Isolation؛ &lrm
Single Friction Pendulum &lrm
Bearing؛ &lrm
&rlm
Seismic Performance
 
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  • تاریخ دریافت 01 مهر 1403
  • تاریخ بازنگری 18 آذر 1403
  • تاریخ پذیرش 17 بهمن 1403