بررسی اثر شمع‌بندی به هنگام حذف ستون در انهدام پیش‌رونده سازه‌های فولادی و بتن آرمه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد ممتاز گروه سازه، دانشکده عمران، دانشگاه سمنان، ایران

2 دانشجوی دکترا سازه دانشگاه سمنان

3 دانشجوی دکتری سازه دانشگاه سمنان

10.22124/jcr.2024.24956.1623

چکیده

در بحث خرابی پیش‌رونده، خرابی یک عضو می‌تواند باعث تخریب زنجیره‌وار، دنباله‌ای و متوالی اعضا شود و درنهایت به تخریب قسمتی از سازه یا خرابی کامل سازه منتهی شود. در بحث کنترل خرابی پیش‌رونده و جلوگیری از آن، تعیین المان کلیدی و تقویت آن می‌تواند از تخریب کلی سازه یا بخش وسیعی از سازه جلوگیری کند. یکی از موضوعات مهم درزمینه‌ی انهدام پیش‌رونده، بحث بار دینامیکی حاصل از حذف ناگهانی اعضا و اثر شمع‌بندی می‌باشد که در تحقیق حاضر این عامل با نگاه مبسوط موردبحث و بررسی قرارگرفته است. در این تحقیق سازه‌های فولادی و بتن‌آرمه 10 طبقه، هر دو با سیستم مقاوم جانبی قاب خمشی ویژه موردبررسی قرارگرفته‌اند. به‌منظور مشخص نمودن المان کلیدی، از روش شاخص حساسیت و با تحلیل استاتیکی غیرخطی افزاینده قائم استفاده‌شده است. با بررسی‌های صورت گرفته، ستون های موجود در گوشه‌ی پلان ساختمان دارای میزان شاخص خرابی بیشتری می‌باشند. این شاخص در دو سازه‌ی بتنی و فولادی به ترتیب 0/72 و 0/68 می‌باشد. اثر شمع‌بندی در محل حذف ستون در انهدام پیش‌رونده در سازه‌ی فولادی و بتن‌آرمه نشان داد؛ که این امر باعث کاهش میزان شاخص خرابی عضو موردنظر در سازه‌ی بتن‌آرمه و فولادی می‌گردد. مقدار شاخص خرابی دریکی از ستون‌های موردمطالعه، در سازه‌ی بتن‌آرمه و فولادی به ترتیب از 0/68 به 0/60 و از 0/47 به 0/36 کاهش پیداکرده است. درصد کاهش شاخص حساسیت در سازه‌ی بتن‌آرمه و سازه‌ی فولادی به ترتیب 11% و 23% است؛ که نشان‌دهنده‌ی عملکرد بهتر سازه‌ی دارای شمع‌بندی در انهدام پیش‌رونده می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the effect of piling during column removal in the progressive collapse of steel and reinforced concrete structures

نویسندگان [English]

  • Ali Kheyroddin 1
  • ehsan jahankhani 2
  • mehdi fakhreddin 3
1 Distinguished Professor of Structure Department, Faculty of Civil Engineering, Semnan University, Iran
2 Ph.D. student in structural civil engineering at Semnan University
3 Ph.D. student in structural civil engineering at Semnan University
چکیده [English]

In the discussion of progressive collapse, the failure of a member can cause a chain, sequential and consecutive destruction of members and ultimately lead to the destruction of a part of the structure or the complete collapse of the structure. One of the most important issues in the discussion of progressive collapse control and its prevention is determining the key element and strengthening it, which can prevent the total destruction of the structure or a large part of the structure. One of the other very important issues in the field of progressive collapse is the discussion of the dynamic load resulting from the sudden removal of members. In the current research, 10-story steel and reinforced concrete structures, both with a special bending frame lateral resistance system, have been investigated. In order to determine the key element, the method of sensitivity index and push down analysis was used. With the investigations carried out in this research, the column in the corner of the current building plan has a higher damage index. This index is 0.72 and 0.68 in two concrete and steel structures, respectively. In the current research, the effect of piling at the place of column removal in the progressive collapse of steel and reinforced concrete structures has been investigated; This reduces the damage index of the desired member in the reinforced concrete and steel structure.

کلیدواژه‌ها [English]

  • Progressive collapse
  • piling
  • nonlinear static analysis
  • key element
  • steel structure and reinforced concrete

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