مطالعه آزمایشگاهی شاخص های خرابی اتصالات تیر-ستون پل های راه آهن بتنی با فولاد مقاومت بالا تحت بار سیکلیک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، دانشکده مهندسی عمران، دانشگاه سمنان

2 استاد دانشگاه سمنان

3 دانشیار، دانشکده مهندسی عمران، دانشگاه سمنان

چکیده

امروزه استفاده از مصالح با مقاومت بالا به دلیل ملاحظات اقتصادی و اجرایی اهمیت فراوانی یافته و توجه بسیاری از محققان را به خود جلب کرده است. استفاده از فولاد مقاومت بالا در سازه های بتن مسلح مزایای فراوانی همچون کاهش مصرف مصالح، زمان و هزینه های جانبی اجرای پروژه و بهبود کیفیت اجرا و... را دارد. اما از سویی دیگر به علت تاثیرات ناشناخته و گاهی نامناسب این دسته از مصالح بر رفتار سازه های بتنی (مانند شکل پذیری کلی، جذب انرژی و افزایش ترک خوردگی سازه های بتن آرمه) کاربرد آنها در سازه های با شکل پذیری ویژه با محدودیت روبرو شده است. در این مقاله، به صورت آزمایشگاهی تاثیر کاربرد فولاد مقاومت بالا بر انواع شاخص های خرابی (برحسب تغییرمکان، انرژی و ترکیبی) در اتصالات تیر-ستون پل های راه آهن بتنی مسلح (که بر اساس ظوابط لرزه ای اعضای با شکل پذیری ویژه طراحی شده اند ) مورد بررسی قرار گرفته است. نتایج آزمایشگاهی نشان میدهد که کاربرد فولاد مقاومت بالا عموما زوال نمونه ها را تسریع کرده و خرابی های سازه ای را افزایش میدهند. از سویی دیگر با کاربرد میلگردهای مقاومت بالا، جذب انرژی نیز کاهش میابد. اما با این حال مشاهدات آزمایشگاهی نشان دادند که تاثیرات مضر فولاد مقاومت بالا به عنوان خاموت از تاثیر آن به عنوان میلگرد طولی کمتر است.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Research on The Damage Indices of Reinforced Concrete Beam-Column Connections of Rail Bridges With High-Strength Reinforcements Subjected to Cyclic Loading

نویسندگان [English]

  • Hamed Arshadi 1
  • Hosein Naderpour 3
1 Ph.D. Candidate of Structural Engineering, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran.
3 Associate Professor, Faculty of Civil Engineering, Semnan University
چکیده [English]

Nowadays, because of the economical considerations, the application of the high-strength materials has been taken into serious considerations by several researchers. High-strength reinforcement application has many benefits like: decreasing material consumption, project time and peripheral costs. However, due to some of their repercussions such as: decreasing the overall ductility, energy absorption and increasing crack widths, their applications are limited in seismic prone areas. In this research, the effect of high-strength reinforcements on the different types of damage indices in the beam-column connections of rail bridges (designed based on the special seismic instructions) are studied experimentally under cyclic loading. Experimental results show that the application of high-strength reinforcements expedites the failure process of the specimens. Moreover, the results show that the energy absorption of the specimens decreases by using high-strength reinforcements either. However, the effects of high-strength reinforcements as stirrups has less repercussions than the case of using them as longitudinal reinforcements.

کلیدواژه‌ها [English]

  • High-Strength Reinforcements
  • Rail Bridges with Rigid Frames
  • Damage Index
  • Reinforced Concrete Structures with Special Ductility
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