بررسی اثر تیر طره در خرابی پیشرونده سازه‌های بتن آرمه با سیستم مقاوم دوگانه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری عمران-سازه،دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 استاد ممتاز گروه سازه، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

10.22124/jcr.2022.18899.1482

چکیده

از مهم ترین مسائل پدافند غیر عامل در سازه ها، موضوع خرابی پیشرونده می‌باشد. خرابی پیشرونده در اثر حوادث عمدی، نظامی، تروریستی، زلزله و سیل اتفاق می‌افتد. در خرابی پیشرونده، در اثر تخریب یک عضو سازه‌ای، خرابی به دیگر اعضای سازه منتقل شده و خرابی به صورت زنجیره‌ای در کل سازه گسترش می‌یابد و باعث تخریب بخش و یا کل سازه می‌گردد. تعیین المان کلیدی و تقویت آن می‌تواند از خرابی پیشرونده، تخریب کلی سازه و خسارات ناشی از آن جلوگیری کند. در این مقاله سازه‌های 5، 10 و 15 طبقه با سیستم دوگانه و تیر طره انتخاب شده است. به منظور بررسی اثر تیر طره بر خرابی پیشرونده و تعیین المان کلیدی در سازه‌های بتن‌آرمه با سیستم دوگانه از روش شاخص حساسیت و تحلیل سازه‌ها، با تحلیل استاتیکی غیرخطی افزاینده قائم (Push Down Analysis) استفاده شده است. نتایج نشان می‌دهد در ساختمان‌های بتن‌آرمه با سیستم دوگانه با تیر طره، شاخص خرابی ستون با با بیشترین فاصله از تیر طره (23 متر) نسبت به سایر ستون‌ها در هر سه سازه 5،‌ 10 و 15 طبقه به ترتیب 87%، 77% و 66% می‌باشد که به عنوان المان کلیدی در این سازه‌ها در نظر گرفته شده است. با توجه به نتایج در صورت افزایش 3 برابری ارتفاع سازه دارای تیر طره با سیستم مقاوم دوگانه از 20 متر (5 طبقه) به 60 متر (15 طبقه)،‌ شاخص خرابی کل سازه از 87% به 66% کاهش می‌یابد که نشان دهنده عملکرد بهتر سازه با افزایش ارتفاع در خرابی پیشرونده می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the effect of cantilever beam on progressive collapse of reinforced concrete structures with dual strength system

نویسندگان [English]

  • Seyedeh Marzieh Qiyami Taklymi 1
  • Ali Kheyroddin 2
1 Ph.D. Student, Department of Civil Engineering, Semnan University, Semnan, Iran
2 Distinguished Prof., Department of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

The most important issues of passive defense in structures is the issue of progressive collapse. Progressive collapse occurs as a result of events deliberate and administrative, military, terrorist, earthquakes and floods. In progressive collapse, due to the destruction of one member of the structure, the failure is transmitted to other members of the structure and the failure extends in a chain throughout the structure and causes the destruction part of or the entire structure. Determining the key element in the structure and strengthening can prevent progressive collapse, total destruction of the structure and the resulting damage. In this paper, 5, 10, and 15 stories structures with dual system with cantilever beam. To investigate the effect of cantilever beams and the determine key element in reinforced concrete structures with dual system by the sensitivity index method and structural analysis is used by non-linear static analysis of vertical down (Push Down Analysis). The results show that in reinforced concrete structures with dual strength system with cantilever beam, the column failure index with the longest distance from the cantilever beam (23 m) compared to other columns in each three structure 5, 10 and 15 story is 87%, 77%, and 66%, respectively, which is considered as a key element in these structures. According to results, in case of increasing the height of structure with cantilever beam with dual strength system from 20 meters (5 story) to 60 meters (15 story), the failure index of the whole structure will decrease from 87% to 66%.

کلیدواژه‌ها [English]

  • Progressive Collapse
  • Nonlinear Static Analysis
  • Sensitivity Index
  • Key Elements
  • Cantilever Beam

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