Flexural Strengthening of Deficient Reinforced Concrete Beams with Post-Tensioned Carbon Composites Using Finite Element Modelling

  • سال انتشار: 1399
  • محل انتشار: Journal of Rehabilitation in Civil Engineering، دوره: 8، شماره: 4
  • کد COI اختصاصی: JR_CIVLJ-8-4_003
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 94
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نویسندگان

Abuzar Hamzenezhadi

Ph.D. Candidate of Structural Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran

Mohammad Sharbatdar

Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

چکیده

The application of external post-tensioned steel bars as an effective way to strengthen an existing bridge has been so far used in many different countries. In recent decades, however, they have been replaced by bars made from Carbon Fiber Reinforced Polymer (CFRP), as a material with high tensile strength and corrosion resistance, to address several concerns with steel bars such as their application costs and difficulties, and also their durability.  Post-tensioning these sheets can be a new efficient method in strengthening the beams and utilizing the high strength of these material.This study has focused on the flexural behavior of beams reinforced by Post-tensioned non-bonded CFRP sheets. ۱۵ beams were categorized in ۳ groups of ۵m-, ۱۰m-, and ۱۵m-span in order to evaluate the effect of some parameters such as level of post-tensioning, sheet length, and beam span on its load capacity, failure mode, ductility, and cracks behavior. The results indicate that even though the increase in post-tensioning levels improves the effectiveness of the method, but this capacity improvement is much more for small span beams especially when CFRP sheets are ۹۰% of the beam span, compared to long span beams. There has been a noticeable capacity increase around ۵۰% in the beams when decreasing the sheet length from ۹۰% to ۴۵% of the beam span and also causing ۱۱-۱۴% increase in ductility in various conditions.

کلیدواژه ها

carbon composite, Finite Element methods, post-tensioning, Unbounded, External reinforcing

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