Strengthening of continuous reinforced concrete beams by CFRP laminates

مقدم أطروحة جامعية

Rashq, Ali Sadiq

مشرف أطروحة جامعية

al-Husni, Hisham Muhammad
al-Sarraf, Subayh Zaki

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2010

الملخص الإنجليزي

In recent years, carbon fiber reinforced polymers (CFRP) have been used to increase the capacity of reinforced concrete structural elements.

Fiber reinforced polymers are typically comprised of high strength fibers (e.g.

carbon and glass) impregnated with an epoxy (often termed the matrix).

The addition of these materials can dramatically change the load carrying capacity as well as the failure mechanism of reinforced concrete beams.

In the present study, experimental and theoretical investigations of the behavior of reinforced concrete beams strengthened by CFRP in flexure case of beams have been presented.

The experimental program consisted of constructing and testing up to failure sixteen RC beams, which were strengthened at some locations with CFRP laminates and carefully designed to fail in flexure.

These tested beams with dimensions 120 mm width, 180 mm depth and 4000 mm length were divided into three groups ; Group one consisted of 9 three-span continuous beams with 1200 mm length for each span, Group two consisted of 3 single-span beams with 1200mm length (each with two overhangs with 1200 length) and Group three consisted of 4 single-span beams with 2400 length (each with one overhang only 1200 mm length.

The results show that the use of CFRP laminate as external strengthening has a significant effect on ultimate load, crack pattern and deflection.

It is observed that the use of external CFRP laminate connected to the beams could enhance the ultimate flexural load capacity up to 102.88 % for group one, 108 % for group two and 104.14 % for group three in flexure over the capacity of the identical reference beam.

Three dimensional nonlinear finite element analyses are conducted to investigate the performance of reinforced concrete beams with CFRP.

ANSYS computer program (version 11.0, 2007) under Microsoft Windows XP (service pack 2, 2002) is used.

Full bond was assumed between CFRP laminates and concrete interface.

With the smeared cracking model, good prediction for post-cracking behavior was obtained.

The comparison between the numerical and the experimental results asserted the validity of the numerical analysis and the methodology developed where the maximum difference ratio in the ultimate load was less than 10 % for all the tested and analyzed beams.

التخصصات الرئيسية

الهندسة المدنية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305237