بررسی عددی رفتار لرزه ای اتصال تیر به ستون پیشنهادی در سازه های فولادی سریع الاحداث با قابلیت جمع و نصب مجدد

نوع مقاله : پژوهشی اصیل (کامل)

نویسنده
سید حامد خلیل پور
دانشگاه قم
10.22034/22.6.21
چکیده
در زمان وقوع بلایای طبیعی نظیر سیل و زلزله، اهمیت فاکتورهایی همچون فراهم کردن اسکان موقت و دائم، سرعت احداث، افزایش مقاومت و کاهش هزینه­ها، توجه به انتخاب سیستم­های باربر قائم و جانبی سازه را یکی از ضروریات صنعت ساختمان می­داند. نیاز به هر ساختمان در هر منطقه‌ای، وابسته به شرایطی متنوعی است که ممکن است در یک بازه زمانی خاص به وجود آمده و در زمان دیگری از بین برود. در این پژوهش برای اولین بار در کشور ابتدا به معرفی یک سازه­های فولادی سریع­الاحداث (موقت و دائمی) با قابلیت جابجایی و جمع و نصب مجدد پرداخته و در ادامه به بررسی رفتار لرزه­ای اتصال تیر به ستون آن جهت کاربرد در قاب خمشی فولادی با شکل­پذیری معمولی پرداخته می­شود. به منظور بررسی سه مشخصه سختی، مقاومت و شکل­پذیری اتصال پیشنهادی، از تحلیل غیرخطی در نرم افزار ABAQUS/6.14.2 استفاده شده و ارزیابی رفتار لرزه­ای اتصال نیز مطابق ضوابط فصل B- بند 4 آیین­نامه فولاد آمریکا صورت گرفته است. مطابق نتایج، مشخصات هندسی مقطع تیر، طول تیر، ضخامت ورق انتهایی، محل و قطر پیچ­ها و همچنین محل سخت­کننده­های ورق انتهایی، از پارامترهای تاثیرگذار بر سختی و مقاومت اتصال فلنجی تیر به ستون هستند. در بین این پارامترها، ضخامت ورق انتهایی و قطر پیچها و به تناسب آن مقدار نیروی پیش­تنیدگی پیچها از مهترین پارامترهای تاثیرگذار بر سختی اتصال می­باشند. بررسی­ها نشان داد که اتصال پیشنهادی با داشتن سختی کافی، توانایی تحمل کل لنگر پلاستیک تیر را دارد. در این اتصال، مفصل پلاستیک در خارج از ناحیه اتصال تشکیل می­شود و مد خرابی حاکم بر آن کمانش موضعی پلاستیک بال فشاری تیر است. ویژگی­های مذکور باعث می­شود که اتصال مذکور به عنوان یک اتصال گیردار کامل از لحاظ سختی و مقاومت، قابلیت کاربرد در سیستم قاب خمشی معمولی پیشنهادی را دارا باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Numerical Investigation of Seismic Behavior of Beam-to-Column Connection in Rapid-Construction Steel Structures with Adjustable and Reinstallable Capability

نویسنده English

S.H. khalilpour
-
چکیده English

The importance of some factors, including providing temporary and permanent habitation, construction speed, increasing the material strength and decreasing the construction cost, have made the attention to choice of vertical and lateral load-bearing systems as one of the necessities of the construction industry in the event of natural disasters such as floods and earthquakes. The need for any building in any area depends on a variety of conditions that may arise at one time and disappear at another. In this study, for the first time in Iran, firstly, a rapid-fabricated steel structure with both temporary and permanent habitation ability, and the capability of moving, assembling and disassembling is introduced, and then the seismic behavior of it’s beam-to-column connection is evaluated for using in ordinary steel moment frames. In order to evaluate the three characteristics of stiffness, strength and ductility of the proposed connection, nonlinear analysis is done using ABAQUS/6.14.2 software, and the evaluation of the seismic behavior of the connection is conducted in accordance with the criterias of chapter B of ANSI/AISC 360-16. According to the results, section properties and length of the beam, end-plate thickness, location and diameter of the bolts, and the location of the stiffeners on the end-plate are the effective parameters on the stiffness and strength of the proposed connection. Among all parameters, end-plate thickness and diameter of the bolts are two important factors that mostly affect the stiffness of the connection. Investigations show that the proposed connection, by having the sufficient stiffness and strength, is able to withstand the entire plastic moment capacity of the beam. Also, the plastic hinge is occurred outside of the connection region and the final failure mode of the system is the plastic local buckling of the compression flange of the beam. The mentioned abilities make it possible to use the proposed beam-to-column connection in ordinary moment frames as a fully restrained and fully strength connection.

کلیدواژه‌ها English

Pre-fabricated structure
Steel Connection
Assemble and Disassemble
Temporary and permanent habitation
Portability
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مهندسی عمران مدرس
دوره 22، شماره 6
آذر و دی 1401
صفحه 21-33