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العنوان
Strengthening Of R.C Deep Beams Using Cfrp,Gfrp /
هيئة الاعداد
مشرف / محمود ماجد السيد محمود السنباطي
مشرف / عمرو حسين زاھر
مشرف / وائل محمد منتصر
الموضوع
Structural engineering.
تاريخ النشر
2019.
عدد الصفحات
220 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة المدنية والإنشائية
تاريخ الإجازة
30/5/2019
مكان الإجازة
جامعة عين شمس - كلية الهندسة - قسم الهندسة المدنية.
الفهرس
Only 14 pages are availabe for public view

from 220

from 220

Abstract

A deep beam is a structural member whose behavior is dominated by shear deformations. In practice, engineers typically encounter deep beams when designing transfer girders, pile supported foundations, or bridge bents .The primary reasons to upgrade an existing structure include building code changes, accidents, design errors or building use changes. For the past twenty-five years, the most popular method for strengthening and repairing structures is to epoxy-bond steel plates to the critical areas of the structure. The main drawbacks to this method are the amount of weight the steel adds to the structure, and the fact that steel rusts when exposed to harsh environments; therefore, is not suitable for all applications. In addition, the plates weight requires the use of special tools and equipment to ensure proper installation . Only a few years ago, the construction market started to use FRP for structural reinforcement, generally in combination with other construction materials such as wood, steel and concrete. FRP exhibit several attractive properties, such as low weight to strength ratio, non-corrosiveness high fatigue strength, and case of application. The main drawback to this method is high cost.
The experimental program has investigated different techniques to improve the performance of RC deep beams with the lowest drawbacks under two concentrated vertical loads using advanced composite materials (CFRP,GFRP Sheets).The primary aim of this research was to study the behavior of deep beams strengthened in shear using carbon fiber, glass fiber and study the behavior of repaired concrete deep beams after loading to first crack in shear using glass fiber sheets and carbon fiber sheets. The main variables in the study were shear span-to-depth ratio, shape of wrapping around the specimen and the type of FRP used.
Thirteen RC deep beam specimens simply supported with span length L=1500 mm , total length =1900mm. and cross section (140 x 450 mm). Tested beam were subjected to the effect of two concentrated loads with spacing of 560,360and 160mm , were tested and divided into five groups. The first group consists of three control beams ( G1.BC1.1.25, G1.BC2.1.5, G1.BC3.1.75 ) , the second group consists of three beams ( G2.BCa1.1.25 , G2.BCa2.1.5 , G2.BCa3.1.75) strengthened by U shape CFRP in shear. The third group consists of three beams also ( G3.Bg1.1.25 , G3.Bg2.1.5 , G3.Bg3.1.75) strengthened by U shape GFRP in shear . The fourth group consists of two beams ( G4.PCa.1.5 , G4.Pg.1.5) strengthened by diagonal CFRP sheets and GFRP sheets Perpendicular to Path of shear crack .The last group consists of two beams ( G5.Re1.1.5 , G5.Re2.1.5 ) repaired by diagonal CFRP sheets and GFRP sheets in shear after loading to first crack.
Research findings indicate that Presence of shear strengthening in deep beams led to decrease deflection , The decreased in deflection for beams attributed to the type, configurations and orientation of FRP sheet .