رفتار دینامیکی سقف مرکب متشکل از پروفایل فولادی تاخورده و صفحه تخت تحت بار انفجار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه سازه-دانشکده مهندسی عمران-دانشگاه صنعتی جندی شاپور دزفول-دزفول-ایران

2 گروه سازه-دانشکده عمران-دانشگاه صنعتی جندی شاپور دزفول-دزفول-ایران

چکیده

یکی از انواع سیستم سقف‌های سازه‌ای تشکیل شده است از ورق فولادی تاخورده و صفحه تخت که به وسیله پیچ‌های خودکار به هم متصل شده‌اند. هدف از تحقیق حاضر بررسی رفتار سقف مذکور تحت بار انفجار است. برای این منظور، تأثیر پارامترهای مختلفی چون: ضخامت صفحه تخت و ورق فولادی تاخورده، نوع صفحه تخت، فاصله پیچ‌های خودکار، شرایط مرزی، ابعاد سقف، دوبل کردن صفحات مذکور و همچنین وزن و فاصله ماده منفجره از مرکز سقف، بر رفتار دینامیکی غیرخطی سقف مذکور مطالعه شد. این بررسی با استفاده از روش عددی اجزا محدود و با بهره گرفتن از نرم‎‎افزار آباکوس انجام گردید. نتایج تحقیق نشان دادند که با تغییر پارامترهایی چون ضخامت و نوع صفحه تخت، ابعاد و شرایط مرزی سقف، دوبل کردن عناصر اصلی و همچنین فاصله و وزن مواد منفجره تغییرات زیادی در تغییرمکان حداکثر و انرژی کرنشی سقف ایجاد می‌گردد، ولی تغییر سایر پارامترهای فوق الاشاره تغییرات زیادی در آنها ایجاد نمی‌کنند. تحت شرایط مختلف سازه‌ای و بارگذاری سقف، در بعضی مدل‌ها ورق فولادی تاخورده و صفحه تخت به تنش تسلیم رسیدند، هرچند آنها در بسیاری از موارد به تنش تسلیم خود نمی‌رسند. نتایج تحقیق حاضر کمک شایانی به محققین و طراحان سازه در شناسائی پارامترهای مؤثر و غیرمؤثر بر رفتار سقف مورد مطالعه تحت بار انفجار می‌نماید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Dynamic Behavior of Composite Floor Consisting Profiled Steel Sheet and Dry Board under Explosion Load

نویسندگان [English]

  • Farhad Abbas Gandomkar 1
  • Saeed Parsafar 2
  • vahid razavi toosi 2
  • Negar Samimifard 2
1 Department of Structure-Faculty of Civil-Jundishapur University of Technology-Dezful-Iran
2 Department of Structure-Faculty of Civil-Jundishapur University of Technology-Dezful-Iran
چکیده [English]

One of the kinds of structural floor systems is consisting of profiled steel sheet and dry board which is connected by self-drilling and self-tapping screws. This research aims to study the behavior of mentioned floor under explosion load. For this purpose, effects of various parameters such as the thickness of the dry board and profiled steel sheet, kind of dry board, screw spacing, boundary conditions, floor dimensions, using of double profiled steel sheet and dry board, and also weight and distance of explosive material from the center of the floor, on the nonlinear dynamic behavior of the mentioned floor are studied. This study was performed by using the numerical finite element method taking advantage of ABAQUS software. The research results showed by varying parameters such as thickness and kind of dry board, dimensions and boundary conditions of the floor, using of double profiled steel sheet and dry board, and also distance and weight of explosive materials, significant changes are created in maximum displacement and strain energy of floor. But, varying other above-mentioned parameters did not create important changes in them. The profiled steel sheet and dry board reached their yield stresses under various conditions, though in many conditions they did not reach their yield stresses. The results of current research present great help to researchers and designers in identification effective and ineffective parameters on the behavior of studied floor under explosion load.

کلیدواژه‌ها [English]

  • Explosion
  • Composite floor system
  • finite element
  • nonlinear dynamic analysis
  • PSSDB
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