ارزیابی رفتار چرخه¬ای قاب سه بعدی فولادی دارای ورق پرکننده و مهاربندهای واگرا
محورهای موضوعی : آنالیز سازه - زلزله
رضا خلیلی
1
,
دکتر احمد ملکی
2
,
رامین کتابفروش بدری
3
1 - دانشگاه آزاد اسلامی واحد مراغه
2 -
3 - گروه مهندسی عمران، واحد آذرشهر، دانشگاه آزاد اسلامی، آذرشهر، ایران
کلید واژه: دیوار برشی فولادی, مهاربند واگرا, المان محدود, بارگذاری چرخه¬ای, میرایی, انرژی,
چکیده مقاله :
دیوارهای برشی فولادی SPSW از سیستم¬های باربر جانبی در سازه¬های فولادی می¬باشد. ایجاد بازشو در ورق¬ فولادی می¬تواند عملکرد کلی سیستم را تحت تاثیر قرار دهد. در این مطالعه به بررسی عملکرد دیوارهای برشی فولادی با بازشو، بدون سخت‌کننده و مهاربندهای واگرا در لبه بازشوها پرداخته شده است. در مدل¬های پیشهادی جهت کنترل کمانش ورق فولادی در لبه بازشو از مهاربندهای واگرا استفاده شده است. جهت طراحی مدل¬ها، از آیین‌نامه فولاد ایران و 2800 استفاده شده و جهت مدل¬سازی از نرم‌افزار المان محدود ABAQUS و بارگذاری به‌صورت چرخه¬ای و پارامترهای مورد بررسی شامل؛ پاسخ (برش پایه- دریفت)، سختی، میرایی و انرژی اتلافی می¬باشد. نتایج مدل¬های عددی نشان دادند استفاده از مهاربندهای واگرا در لبه بازشو منجر به کاهش 15 درصدی برش پایه نسبت به مدل دیوار برشی فولادی رایج می¬شود و همچنین در مدل پیشهادی علاوه بر وجود بازشو روند کاهش سختی با مدل دیوار برشی رایج تقریباً یکسان می¬باشد. پارامتر میرایی و انرژی در مدل پیشهادی نسبت به مدل دیوار برشی فولادی افزایش یافته، که نشان‌دهنده افزایش ظرفیت سازه در استهلاک انرژی می¬باشد.
Steel plate shear walls (SPSWs) are lateral resisting systems in steel structures. Creating an opening in the steel plate can affect the overall performance of the system. In this study, the performance of SPSW with openings, without stiffeners and eccentric braces at the edges of the openings has been investigated. Eccentric braces are used in the leading models to control the buckling of the steel plate at the opening edge. For the design of the models, the Iran Steel and 2800 Code were used, and for the numerical modeling, the ABAQUS finite element software and cyclic loading were used, and the investigated parameters included the response (base shear-drift), stiffness, damping, and dissipation energy. The results of numerical models showed that the use of eccentric braces in the opening edge leads to a 15% reduction in the base shear compared to the traditional SPSW model, and in purposed model, the stiffness reduction is almost the same as in the traditional SPSW model. The damping and energy parameters in the designed model have increased compared to the SPSW model, which indicates the increase in the capacity of the structure in energy consumption
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