رفتار مکانیکی پوسته های استوانه ای جدار نازک کامپوزیت سیمانی مسلح به الیاف تحت بارگذاری داخلی یکنواخت

نوع مقاله: علمی - پژوهشی

نویسندگان

1 استادیار،گروه عمران، دانشکده فنی، دانشگاه گیلان، رشت، ایران

2 کارشناس ارشد مهندسی سازه، پردیس دانشگاهی، دانشگاه گیلان، رشت، ایران

3 کارشناس ارشد مهندسی سازه، دانشکده فنی، دانشگاه گیلان، رشت، ایران

چکیده

با پیشرفت و توسعه صنعت بتن، ساخت سازه های مدرن با بهره وری فنی و اقتصادی بالا به امری اجتناب ناپذیر تبدیل شده که از جمله آن ها می توان به سازه های پوسته ای بتنی اشاره کرد. سازه های پوسته ای بتنی که اغلب "پوسته جدار نازک" نامیده می شوند، عناصر سازه ای مناسب برای احداث زیرساخت های بزرگ تاسیساتی مانند مخازن نفت و آب، سیلوها و غیره هستند. در این تحقیق رفتار مکانیکی پوسته های استوانه ای جدار نازک کامپوزیت سیمانی مسلح به الیاف تحت بارگذاری یکنواخت داخلی از نوع هیدرواستاتیک مورد ارزیابی قرار گرفته است. به همین منظور 36 مدل کوچک از پوسته های استوانه ای جدار نازک حاوی 0%، 5% و 10% دوده سیلیسی (جایگزین وزن سیمان) و 0%، 5/0%، 1%، 5/1%، 2% و 5/2% الیاف شیشه با نسبت آب به سیمان 38/0 ساخته و پس از 28 روز عمل آوری در شرایط مرطوب، آزمایش شدند. همچنین مقاومت فشاری نمونه های مکعبی و نیز مقاومت خمشی نمونه های منشوری برای ایجاد ارتباط با نتایج پوسته های استوانه ای ساخته شدند. نتایج نشان داده است که استفاده از دوده سیلیسی موجب افزایش مقاومت های فشاری و خمشی به ترتیب تا 27% و 32% می شود. همچنین حضور الیاف اثر قابل توجهی بر افزایش مقاومت فشاری نداشته اما موجب افزایش مقاومت خمشی تا 21% می شود. در استوانه های جدارنازک افزودن دوده سیلیسی موجب افزایش مقاومت کششی حلقوی تا 10% و کاهش کرنش تا 28% می شود. همچنین افزودن 5/2% و 5/0% الیاف شیشه به ترتیب موجب افزایش 4/7 برابری کرنش نهایی و رشد 37% مقاومت کششی حلقوی می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Mechanical behavior of fiber reinforced cementitious composite thin- wall cylindrical shells under internal loading uniform

نویسندگان [English]

  • S. Hosein Ghasemzadeh mosavinejad 1
  • Ashkan Saradar 2
  • Behzad Tahmouresi 3
1 Assistant Professor of Civil Engineering Department, Technical Faculty, University of Guilan., Rasht, Iran
2 M.Sc in Structural Engineering, University Campus, University of Guilan., Rasht, Iran.
3 M.Sc in Structural Engineering, University Campus, University of Guilan., Rasht, Iran.
چکیده [English]

With the advancement and development of the concrete industry, the construction of modern structures with high technical and economic efficiency is inevitable, that among which can be cited concrete shell structures. Concrete shell structures that often referred to as ’thin- wall shells’ are suitable structural elements for building spacious infrastructures facilities such as oil and water tanks, silos and etc. In this study, the mechanical behavior of fiber-reinforced cementitious composite thin-wall cylindrical shells under uniform hydrostatic loading has been studied. For this purpose, 36 small sized model of thin-walled cylindrical shells continuing 0%, 5%, 10% sf (partial cement replacement) and 0%, 0.5%, 1%, 1.5%, 2%, 2.5% glass fiber with w/c=0.38 were made and tested after 28 days of wet curing conditions. The compressive and flexural strengths of composite samples were tested to relating concrete strengths with the results of cylindrical shells. Results showed that, the use of silica fume has increased compressive and flexural strength up to 27% and 32%, respectively. Moreover, it also showed that the presence of fiber had no significant effect on compressive strength but increased flexural strength to 21%. In cylindrical shells the addition of sf has increased annular tensile strength to 10% and reduced a strains to28%. Furthermore, addition of 2.5% and 0.5% glass fiber has raised ultimate strain 7.4 times and annular tensile strength up to 37%, respectively.

کلیدواژه‌ها [English]

  • cementitious composite
  • Thin- wall cylindrical shell
  • Hydrostatic loading
  • glass fiber
  • Silica fume

 

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