بررسی تأثیر موج انفجار بر سقف‌های بتنی پیش‌تنیده‌ استوانه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی شاهرود

2 دانشگاه تربت حیدریه

3 دانشگاه پارس رضوی گناباد

چکیده

در این مقاله به تحلیل اثر موج انفجار در سقف­های بتنی پیش­تنیده با نرم­افزار آباکوس پرداخته شده است. در ابتدا، یک سقف نیم استوانه‌ای بدون پیش­تنیدگی تحت تأثیر موج ناشی از انفجار یک تن TNT در فاصله 10 متری از میانه طولی سازه در نرم‌افزار آباکوس تحلیل شد. با هدف بررسی تأثیر پیش­تنیدگی بر مقادیر تنش و خرابی­های کششی و فشاری، سازه تحت پیش­تنیدگی فشاری 3، 5 و 8 مگاپاسکالی قرار گرفت. افزون بر این، اثر طول دهانه بر نتایج تنش و خرابی پوسته سقف با بهره‌جویی از سه طول دهانه 30، 45 و 60 متری مورد ارزیابی قرار گرفت. نتایج تحلیل­ها نشان داد که پیش­تنیده کردن سقف پوسته از حجم خرابی ناشی از انفجار می­کاهد. همچنین افزایش طول دهانه، تمرکز خرابی­ها را روی محورهای تقارن سبب می­گردد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Explosion Wave Effect on Cylinderical Pre-Stressed Concrete Shells

نویسندگان [English]

  • E. Zamani Beydokhti 1
  • M. Yaghoobi 2
  • S. E. Niknam 3
  • N. Arvin Kheybari 2
1
2
3
چکیده [English]

In this paper, the explosion wave effect on prestressed concrete shells was numerically discussed. For this purpose, at first, a semi cylindrical shell roof without pre-stressing imposed by an explosion of a ton of TNT at a distance of 10 meters from the center line of the structure. The finite element analysis was performed by Abaqus software and the results of tensile and compression failures are extracted and verified by the results of the literature. In order to investigate the effect of pre-stressed tendons in longitudinal direction on mises stresses and tensile and compression failures, the semi cylinders were pre-stressed by 3 MPa, 5 MPa and 8 MPa. In addition, the effect of the span length on the results of mises stresses and failure modes was evaluated using three lengths of 30, 45 and 60 meters. The results of the analysis showed that the pre-stressed structures would reduce the damage caused by the explosion. Increasing the span length causes the failure to focus on longitudinal symmetrical axes.

کلیدواژه‌ها [English]

  • Prestressed Concrete
  • Explosion Wave
  • Semi-Cylindrical Shell
  • Tensile Failure
  • Compression Failure
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