بررسی آزمایشگاهی اتصالات خارجی تیربه ستون بتنی با میلگردهای پلیمری مسلح الیافی و فولادی تحت تاثیربارهای چرخه ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی عمران ، گروه مهندسی عمران ، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشیار ، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

3 استاد ، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

در این پژوهش، رفتار اتصال خارجی تیر به ستون بتنی تحت تاثیر بارگذاری چرخه‌ای با میلگردهای پلیمری مسلح الیافی GFRP )) مورد بررسی قرار می‌گیرد. در این پژوهش 8 نمونه آزمایشگاهی اتصال خارجی تیر به ستون بتنی ساخته و آزمایش شد. همچنین از دو نوع بتن، با مقاومت‌های 30 و 45 مگاپاسکال استفاده شده است. در 4 نمونه از میلگردهای پلیمری مسلح الیافی و در 4 نمونه از میلگردهای فولادی، برای اتصال تیر به ستون استفاده شده است. میزان محصورشدگی میلگردهای طولی تیر در محل اتصال نمونه‌ها ، متفاوت در نظر گرفته شده است. نمونه‌ها تحت بارگذاری چرخه‌ای آزمایش شدند. نتایج پژوهش نشان داد که میلگردهای پلیمری مسلح الیافی، دارای جذب انرژی مناسب بودند اما این مقدار جذب انرژی درمقایسه با میلگردهای فولادی کمتر بود. گرچه مقدار جذب انرژی در میلگردهای پلیمری مسلح الیافی کمتر از میلگردهای فولادی بود اما مقاومت در برابر خوردگی می‌تواند به عنوان جانشینی برای میلگردهای فولادی یا ترکیبی با میلگردهای فولادی باشد. نمودار پوش منحنی‌های بار- تغییرمکان نسبی در نمونه‌های با میلگردهای پلیمری مسلح الیافی در نمونه‌های با مقاومت بالا شرایط پذیرش اتصال را به عنوان عضوی از یک قاب خمشی در شرایط لرزهای اقناع نمود. گرچه با بررسی رفتار نمونه‌ها در میلگردهای فولادی مشخص شد تمام نمونه‌های شرایط پذیرش اتصال را داشتند. در نمونه‌هایی با میلگردهای پلیمری مسلح الیافی، در بتن‌های معمولی و مقاومت بالا، با افزایش بار چرخه‌ای شکست در محل اتصال تیر به ستون به صورت خمشی در تیر ایجاد گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation on exterior RC beam-column connections subjected to cyclic loadings using Steels, Fiber Reinforced Polymers reinforced bars

نویسندگان [English]

  • Hossein Rezaee Azariani 1
  • Hashem Shariatmadar 2
  • mohammad Reza esfahani 3
1 phd student,civil engineering- ferdowsi university of mashhad
2 civil - engineering- ferdowsi university of mashhad
3 Ferdowsi University of Mashhad
چکیده [English]

In the present experimental research, the behavior of exterior reinforced concrete (RC) beam-column connections subjected to cyclic loading is studied using steel and Glass Fiber-Reinforced Polymer (GFRP) reinforcing bars. In this research, 8 specimens of exterior RC beam-column connections were tested in which four specimens included GFRP reinforcing bars and the remaining four specimens included steel bars. The confinement of beam longitudinal bars was different in the connections. Also, two types of concretes were used with the strengths 30 and 45 MPa, respectively. The specimens were tested under cyclic loading. The results showed that GFRP has great ability in dissipation of energy, yet the amount of the dissipated energy by GFRP is less than that of steel bars. Although the amount of energy absorbed by GFRP materials was lower than steel bars, they could be used instead of steel bars or in combination with steel bars due to the resistance to the corrosion. Load-story drift envelop for GFRP strengthened specimens with high strength concrete has the essential requirements for acting as a member of a moment frame in seismic regions, while all the specimens with steel bars have these requirements. In case of GFRP strengthened specimens with high and normal strength concrete, increasing the cyclic loading results in flexural failure of the beam in the beam-column connection region. Increasing the confinement of concrete beams leads to the reduction of crack width. Furthermore, at higher drifts, spalling was not observed in concrete surface in beam-column connection region.

کلیدواژه‌ها [English]

  • Fiber Reinforced Polymers (FRP)
  • Reinforced Concrete
  • Beam-Column Connections
  • Drift
  • Cyclic Loading

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نشریه مهندسی عمران امیرکبیر
دوره 51، شماره 5
آذر و دی 1398
صفحه 885-906

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