ارزیابی عملکرد لرزه‌ای قاب‌های فولادی حاوی سیستم قاب-ستون-پیوند دوگانه تحت زمین‌لرزه‌های متوالی

نوع مقاله : مقاله پژوهشی

نویسندگان

• فرزانه تفرشی ¹
• الهام رجبی ¹
• یاسر گلستانی ²

¹ گروه پژوهشی تحلیل کمی و کیفی سیالات و محیط زیست، دانشکده مهندسی عمران، دانشگاه تفرش، تفرش، ایران

² دانشکده مهندسی عمران، دانشگاه زنجان، زنجان، ایران

10.22067/jfcei.2025.90190.1324

چکیده

زلزله‌های متوالی به دلیل وقوع در فاصله زمانی کوتاه، باعث تجمع آسیب‌های لرزه‌ای در سازه‌ها می‌شوند. اخیراً در راستای مدیریت و کاهش آسیب‌های موجود به سازه، سیستم نوین باربر لرزه‌ای دوگانه سیستم قاب- ستون- پیوند (LCF) معرفی شده‌است. در این مقاله چهار قاب‌ فولادی مجهز به LCF حاوی تیرهای پیوند با رفتار برشی و خمشی طراحی و در نرم‌افزار اپنسیس پیاده‌سازی شده‌است. پس از انجام تحلیل‌های دینامیکی غیرخطی در دو حالت زلزله‌های با و بدون توالی لرزه ای، پارامترهایی نظیر جابه‌جایی‌های نسبی طبقات و بام، نیروی برش پایه و شاخص خسارت پارک-اَنگ استخراج شده‌است. نتایج نشان می دهد زلزله‌های متوالی به نسبت منفرد آسیب لرزه‌ای بیشتری به سازه‌ها وارد نموده و قاب‌ها با رفتار برشی تیرپیوند بهترین عملکرد را دارند. در کل زلزله‌های متوالی به‌طور میانگین بین 2 تا 38 درصد اثرات مخرب‌تری نسبت به زلزله‌های منفرد بر سازه‌ها دارند. سازه‌ 6 طبقه با عملکرد خمشی بیشتر از سازه‌های دیگر تحت تأثیر زلزله‌های متوالی قرار می‌گیرند. همچنین قاب‌ها با عملکرد خمشی در زلزله‌های متوالی نسبت به زلزله‌های منفرد، شاخص خسارت بالاتری را نشان داده‌اند. به‌طور خاص، شاخص خسارت در طبقات پایین‌تر قاب‌ 6 طبقه خمشی تا 38 درصد بیشتر از حالت منفرد بوده‌است.

کلیدواژه‌ها

• سیستم قاب-ستون-پیوند دوگانه
• پدیده توالی لرزه‌ای
• تحلیل دینامیکی غیرخطی
• فیوز سازه‌ای
• شاخص خسارت

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عنوان مقاله [English]

Seismic Evaluation of Steel Frames with Dual Linked-Column- Frame under Successive Earthquakes

نویسندگان [English]

• Farzaneh Tafreshi ¹
• Elham Rajabi ¹
• Yaser Golestani ²

¹ Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering, Tafresh University, Tafresh 39518-79611, Iran

² Department of Civil Engineering, Zanjan University Zanjan, Iran.

چکیده [English]

Since successive shocks occur with short time interval, damage will accumulate in the structures. Recently, linked column frame system (LCF) as a new dual lateral-resisting system, has been introduced in order to manage and reduce the structural damage. In this paper, 4 steel frames equipped by dual LCF and shear/flexure link beams were designed and implemented in Opensees. After nonlinear static and dynamic analysis for single and consecutive earthquakes, parameters such as displacements of the roof and stories, base shear and Park-Ang damage index were investigated. The results showed that successive earthquakes cause more seismic damage to structures than single ones and the frames with the shear link beams have better performance. In general, consecutive earthquakes have an average of 2 to 38% more destructive effects on structures than single earthquakes. Among models, 6 story frames with flexure linked beams are more affected by successive earthquakes than other models. Also, LCF frames with flexure linked beams have more damage index under in successive earthquakes than single shocks. Specifically, the damage index in the lower stories of the 6-story LCF frame with flexure linked beams was 38% higher than the single case.

کلیدواژه‌ها [English]

• Dual Linked-Column-Frame system
• Seismic sequence phenomenon
• Nonlinear dynamic analysis
• Structural fuse
• Damage index

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