Behavior of lightweight concrete beams reinforced with fiber reinforced polymer bars

مقدم أطروحة جامعية

al-Shamaa, Mushriq Fuad Kazim

مشرف أطروحة جامعية

al-Shaarbaf, Ihsan Ali Saib
al-Mashhadani, Shakir A.

الجامعة

الجامعة التكنولوجية

الكلية

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القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2010

الملخص الإنجليزي

This research is devoted to investigate the behaviour of lightweight concrete beams reinforced with FRP ( fibre reinforced polymer) rebars under flexural loading.

The experimental part of this work includes testing eighteen concrete beams (twelve beams are lightweight concrete and six beams are normal concrete ) reinforced with GFRP ( glass fibre reinforced polymer), BFRP( basalt fibre reinforced polymer) or steel.

A series of tests were carried out on construction materials and control specimens (cubes and cylinders).

The main parameters considered in the experimental tests are, type of concrete(lightweight or normal), type of reinforcement (steel or FRP ), type of FRP(GFRP or BFRP ), the reinforcement ratio, strength of concrete and the shear span to effective depth (a/d) ratio on the behaviour and load carrying capacity of the tested beams.

The experimental results showed that the overall flexural response of the lightweight concrete beams used in this study closely resembles that of an equivalent beams with normal concrete.

It was found that the ratio of load carrying capacity of lightweight to normal concrete beam ranged between 0.855 and 0.967.

On other hand, the experimental results showed the load carrying capacity increased for a beam reinforced with FRP rebars compared to that of a corresponding beam reinforced with steel rebars.

It was found that the ratio of load carrying capacity of beams reinforced with FRP to steel rebars ranged between 1.1 and 1.21.

The experimental results of flexural strength of FRP reinforced concrete beams are compared to their analytical values using two proposed methods(proposed method one and proposed method two) in addition to major code and guidelines methods (ACI 440.1R,2006; ISIS M3, 2007; fib TG 9.3, 2007) for balanced, over-reinforced and under-reinforced sections.

Analytical predictions were based on the compatibility of strains and equilibrium of forces.

Proposed method one uses BS 8110,1997 Parabolarectangle stress–strain model while proposed method two uses EC2, 2004 biliner stress–strain model of concrete in compression.

The results obtained for the ultimate capacity using the proposed methods show good agreement with the experimental results.

It was found that the ultimate load predicted using proposed method one and proposed method two are, on the average, about 2.8% and 4.6% respectively higher than experimental load carrying capacity

التخصصات الرئيسية

الهندسة المدنية

الموضوعات

• الخواص الميكانيكية
• الخرسانة المسلحة

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305059