بررسی اثر بارگذاری انفجار بر روی پناهگاه های شهری

نوع مقاله : مقاله های برگرفته از رساله و پایان نامه

نویسندگان

1 دانشجوی دکتری مهندسی عمران، گروه مهندسی عمران، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران

2 استادیار، گروه مهندسی عمران، واحد شبستر، دانشگاه آزاد اسلامی، شبستر، ایران

3 استادیار، گروه مهندسی عمران، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران

چکیده

طراحی پناهگاه پدیده جدی است که امروزه بیش از هر زمانی اهمیت آن درک میشود.پاسخ دینامیکی سازه پناهگاه که از نزدیک، بدون تماس با بارگذاری انفجاری، در معرض انفجار قرار می گیرد، بسیار پیچیده است. این پیچیدگی به دلیل اندرکنش نسبی بین خاک اطراف و سازه؛ و تضعیف موج انفجار در محیط خاک است. در مطالعه حاضر، تجزیه و تحلیل المان محدود با استفاده از بسته نرم افزاری اجزای محدود ABAQUS به طور صریح انجام شده است. سازه با استفاده از عناصر پوسته‌ای، که در آن، اثر اندرکنش خاک-سازه با استفاده از مدل فنر - ضربه گیر- جرمِ ولف (Wolf) مدل شده است. انفجار با استفاده از مدل خطی تاریخچه فشار-زمان بر اساس تری نیتروتولویین (TNT) معادل و فاصله تا محل انفجار مدلسازی شده است. برای نرخ حساسیت کرنش مواد، مدل مواد جانسون کوک (JC) استفاده شده است. بررسی اثر فاصله پیمایش، نوع خاک و عمق دفن مورد مطالعه قرار داده شده است. نتایج نشان دهنده آن است که که اندرکنش خاک-سازه و نوع خاک نقش مهمی را در رفتار دینامیکی سازه ایفا می کند. متوسط خاک اطراف به کاهش پاسخ سازه که در معرض انفجار نزدیک، بدون تماس است، کمک می کند.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the effect of explosion loading on the shelter

نویسندگان [English]

  • asghar ashrafpour 1
  • saeid javaherzade 2
  • Asghar rasouli 3
1 PhD student in Civil Engineering, Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran
2 Assistant Professor, Department of Civil Engineering, Shabestar Branch, Islamic Azad University, Shabestar, Iran
3 Assistant Professor, Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran
چکیده [English]

The dynamic response of the shelter structures subjected to the near-field and with no-contact explosion and blast loadings can have a considerable amount of complexity. Therefore, this complexity is caused by the relatively interaction between soil and structure and the attenuation of the explosion waves in the soil environment. In the present research, the finite element analysis is done through the explicit method by the finite element computer software called ABAQUS. The structure modeling is done by using the membrane elements which the effect of the soil-structure interaction is modeled by using Wolf’s spring-mass-spring model. The explosion and blast loading are modeled using the linear pressure-time history model based on equal trinitrotoluene (TNT) and the explosion and blast loading distance. The Johnson-Cook material model is used for the sensitivity rate of the material’s strain. The assessment of the soil’s survey, soil type, and depth of burial are investigated in this present research. Results show the soil-structure interaction and soil type play an essential role in the dynamic response of the structure. Also, the mean amount of surrounding soil helps reduce the response of the structure subjected to the near-field no-contact explosion and blast loading.

کلیدواژه‌ها [English]

  • Blast Loading
  • Shelter structure
  • Soil-structure interaction
  • Dynamic response
  • Johnson Cook modeling
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