بررسی تاثیر آتش بر رفتار اتصالات پیچی تیر به ستون با صفحه انتهایی و سپری اتصال

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشگاه غیرانتفاعی ایوانکی، سمنان، ایران

2 استادیار دانشکده عمران دانشگاه ایوانکی، سمنان، ایران

3 کارشناسی ارشد، گروه مهندسی عمران، دانشگاه غیرانتفاعی ایوانکی، سمنان، ایران

4 گروه عمران، دانشکده مهندسی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

5 گروه مهندسی زلزله و ژئوتکنیک، دانشکده مهندسی عمران و نقشه برداری، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، کرمان، ایران

چکیده

در این تحقیق به مقایسه عملکرد اتصالات پیچی تیر به ستون با صفحه انتهایی و سپری اتصال تحت اثر بار آتش پرداخته شده است. بنابراین برای نیل به این هدف، نمونه‌ها در سه حالت تعداد پیچ، ضخامت صفحه انتهایی و سپری اتصال در نرم‌افزار اجزا محدود ABAQUS مورد بررسی و تحلیل غیر خطی قرار گرفته‌اند و منحنی‌های جابجایی-زمان، کانتورهای تنش و تغییرمکان مطالعه شده‌اند. با توجه به نتایج تحلیل‌های اجزا محدود غیر خطی، در حالت‌های اول و دوم به بررسی اتصالات تیر به ستون پیچی با تغییر تعداد پیچ و افزایش ضخامت صفحه انتهایی پرداخته شده که نشان می‌دهد بیشترین و کم‌ترین مقدار منحنی‌های جابجایی-زمان مربوط به نمونه‌-های دارای صفحه انتهایی با ضخامت 25 میلی‌متر و تعداد 4 پیچ و صفحه انتهایی با ضخامت 10 میلی‌متر و تعداد 4 پیچ می‌باشد، که با در نظر گرفتن تأثیر ضخامت صفحه انتهایی تحت آتش به ترتیب معادل 36% و 17% تا ایجاد گسیختگی مقاومت دارند. همچنین می‌توان مشاهده کرد که از میان نمونه‌های موردنظر، اتصالات با صفحه انتهایی ضعیف و تعداد پیچ کمتر در لحظه‌ی نهایی باربری در پایان تحلیل آتش به علت بالا بودن تنش، ایجاد مفاصل پلاستیک مشاهده می‌شود. در حالت سوم به بررسی سپری اتصال با افزایش ضخامت پرداخته شده که نتایج نشان دهنده این است که بیشترین و کم‌ترین مقدار جابجایی-زمان مربوط به نمونه‌ها‌ی سپری اتصال با ضخامت 5/17 میلی‌متر و 9 میلی‌متر می‌باشد که تحت آتش به ترتیب معادل 25% و 11% تا ایجاد گسیختگی مقاومت می‌کنند. با مقایسه نتایج اتصالات تیر به ستون پیچی با تغییر تعداد پیچ و افزایش ضخامت صفحه انتهایی و اتصالات با سپری بهترین نمونه، نمونه‌ی دارای صفحه انتهایی به ضخامت 25 میلی‌متر با تعداد 8 پیچ می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Effect of Fire Loading on the Behavior of Connections with Beam-to-Column Bolted End Plate and T-Connection

نویسندگان [English]

  • Vahid Saberi 1
  • hamid saberi 2
  • Seyed Pouriya Panahkhah 3
  • Abbasali Sadeghi 4
  • Ehsan Noroozinejad Farsangi 5
1 Assistant Professor, Department of Civil Engineering, Eyvanekey University, Semnan, Iran
2 Assistant Professor, Department of Civil Engineering, University of Eyvanekey, Semnan, Iran
3 M.Sc, Department of Civil Engineering, Eyvanekey University,Semnan, Iran
4 Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran
5 Faculty of Civil and Surveying Engineering, Graduate University of Advanced Technology, Kerman, Iran
چکیده [English]

In this study, comparison of the performance of beam-to-column bolted end plate connections and T-connection under fire is considered. To achieve this objective, samples are selected in three types of bolt number, the thickness of end-plate, and T-connection. Then, they are investigated and nonlinearly analyzed in ABAQUS finite element software and the results such as displacement-time curves, counters of stress and displacement are studied. According to the nonlinear finite element analyses results obtained in the first and second types, the beam-to-column connections have been investigated by changing the number of bolts and increasing the thickness of the end plate. The results indicated that the highest and lowest values of displacement-time curves are related to the samples have a 25 mm thickness end-plate with 4 bolts and a 10 mm thickness end-plate with 4 bolts, which affect the thickness of the end-plate with 36% and 17% fire resistance to rupture, respectively. It can also be seen that among the samples, connections with weak end-plates and fewer bolts in the final moment of loading at the end of fire analysis due to the high stress of plastic hinges can be seen. In the third type, the T-connection is examined with increasing thickness. The results showed that the maximum and minimum values of displacement-time curves are related to samples with a thickness of 17.5 mm and 9 mm with 25% and 11% fire resistance up to rupture, respectively. By comparison of the results of beam-to-column connection by changing the number of bolts and increasing the thickness of the end-plate and T-connection, the best sample has 25 mm thickness end plate with 8 bolts.

کلیدواژه‌ها [English]

  • Beam-to-Column Bolted Connections
  • End Plate
  • T-Connection
  • Fire
  • Nonlinear Finite Element Analysis
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