تعیین ضریب رفتار پوشش بتنی سازه‌های زیرزمینی تحت بارگذاری انفجاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه جامع امام حسین (ع)، تهران، ایران

2 دانشگاه های امام حسین و قم

3 گروه عمران

4 موسسه ساحل

چکیده

به طور کلی سازه‌های زیرزمینی در هنگام اعمال بارهای دینامیکی همچون زلزله و انفجار از خود رفتار غیرخطی نشان می دهند. یکی از مهمترین پارامترها برای بارگذاری، تحلیل و طراحی این نوع از سازه‌ها تحت اثر بارهای دینامیکی ضریب رفتار است. این ضریب به نحوی مشارکت دهنده رفتار غیرخطی سازه در تحلیل‌های خطی و یا به عبارت دیگر یک عامل موثر بر رفتار غیرخطی سازه در تحلیل‌های خطی است. با اعمال این ضریب می‌توان تحلیل های خطی را جایگزین تحلیل های غیرخطی مرسوم در تحلیل و طراحی سازه های مقاوم در برابر انفجار که عمدتا وقت‌گیر و پیچیده‌اند، نمود. بررسی‌ها نشان می‌دهد، مقدار یا محدودهی قابل قبولی برای ضریب رفتار پوشش بتنی سازه‌های زیرزمینی تحت اثر بارهای انفجاری مشخص نمی‌باشد. به صورت متداول برای یافتن این ضریب ابتدا سازه توسط یک نرم‌افزار عددی که قادر به محاسبه اندرکنش سازه و خاک است، مدل می شود. در این تحقیق مفاصل پالستیک با استفاده از نرم‌افزار SAP2000 معرفی شده و تحلیل پوش آور روی پوشش بتنی تونل تحت الگوی بار انفجاری صورت پذیرفته است. همچنین به کمک خروجی تحلیل های عددی، منحنی دو خطی نیرو-تغییر مکان قائم برای سطوح عملکرد مختلف سازه ترسیم شده است. در انتها با کمک روابط تحلیلی بیان‌شده در مقاله، ضریب رفتار سازه تحت الگوی بار انفجاری به دست می‌آید. مشاهده می‌شود ضریب رفتار برای اینگونه سازه‌ها فقط وابسته به دو پارامتر شکل‌پذیری سازه و مقاومت افزون آن در رفتار غیرخطی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Reduction Factor for concrete coatings of underground structures under blast loading

نویسندگان [English]

  • safa peyman 1
  • Mohammad Hossein Taghavi Parsa 2
  • amin babaie 3
  • ahmad akbari 4
1 School of Civil Engineering, Imam Hossein University, Tehran, Iran
2 IHU,QOM ac
3 دانشگاه امام حسین علیه السلام
4 sahel Consulting
چکیده [English]

The reduction factor (R) is one of the most important parameter of loading, analyzing and designing structures subjected to dynamic loading such as earthquake and explosion. This coefficient considers the nonlinear behavior of the structure in linear analysis. Investigations show that the acceptable range for reduction factor of concrete coating of underground structures applied to explosive loading is not determined completely. To find out this factor, the tunnel structure must first be modeled numerically. The interaction between the structure and the soil and their mechanical properties should be modeled so Winkler spring was proposed. In this research, plastic hinges were introduced in the SAP2000 software, and a pushover analysis was carried out. Outputs of this analysis result in the vertical force-displacement diagrams and their behaviors were plotted for each tunnel performance levels. The Reduction Factor is obtained for a special pattern loading of explosive charge by using the relationships which is developed in this research. It can be noted that the reduction factor for such structures depends on two parameters including ductility and strength factor

کلیدواژه‌ها [English]

  • Reduction Factor
  • Non-linear analysis
  • Winkler spring
  • Plastic hinge
  • Tunne
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