Experimental and theoretical study of concrete brick walls on reinforced concrete beams

العناوين الأخرى

الدراسة العملية و النظرية لجدران الطابوق الخرساني المستندة على أعتاب خرسانية مسلحة

مقدم أطروحة جامعية

Khudayr, Muslim Abd al-Amir

مشرف أطروحة جامعية

Ali, Anis Abd al-Khidr Muhammad

الجامعة

جامعة البصرة

الكلية

كلية الهندسة

القسم الأكاديمي

قسم الهندسة المدنية

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

The nonlinear behavior of concrete brick walls resting on reinforced concrete beams under loading in-plan has been studied in this research through experimental tests and by numerical analysis using finite element method.

The Experimental work included testing of five wall-beam composites with various wall heights resting on reinforced concrete beams.

Another one reinforced concrete beam without upper wall is studied as a control case.

In all cases, the wall-beam composite is not provided with any type of plastering.

The wall-beam composites are subjected to two-point load.

The main variable in the experimental study is wall height / beam span ratio (h / L).

Also, experimental work included uniaxial compressive tests on (230 x 120 x 60) mm3 (length x width x height) concrete brick prisms to evaluate the stress-strain relationship of concrete brick panel.

The load-deflection, cracking pattern, cracking load, the ultimate load and mode of failure are reported for various cases of the (h / L) ratio.

In the numerical part, nonlinear finite element analysis was carried out to study the behavior of all concrete brick wall-beam composites.

The finite element analysis was carried out using the software (ANSYS V 11.0).

Effect of relative stiffness of masonry wall and its supporting beam, strength of wall-beam interface, opening in the wall-beam composites, and reinforcement in the supporting beam were studied.

From the experimental and theoretical tests it was found that all the wall-beam composites develop an increase in the stiffness when increasing (h / L) ratio.

The increase in the stiffness is very significant below the ratio (h / L) = 0.53.

Beyond this ratio, the increase in the stiffness is not that much significant.

On other words, beyond the (h / L) ratio of 0.53, the arch action inside the wall develops and most of the load goes to the supports.

It was also found that the mid-span deflection of the wall-beam composite greatly decreases with the increasing in the (h / L) ratio.

This happened for all cases of (h / L) less than 0.53.

Beyond this ratio, the wall-beam composite exhibits very minor reduction in the mid-span deflection with a further increasing in the (h / L) ratio (cases of h / L = 0.7 and 0.83).

The shear stresses are concentrated at the outer one-thirds from both sides of the wall-beam interface.

These shear stresses may cause interface failure before yielding of foundation beam or crushing of masonry above supports.

The interface failure took place when (h / L) less than 0.53.

It was found that the failure mode for wall-beam composites is different according to (h / L) ratio.

The specimens which have (h / L) ratio less than 0.53 were failed by flexure in beam.

But, the specimens that have (h / L) greater than 0.53 failed by shear in the wall and crushing of supported beam at supports.

التخصصات الرئيسية

الهندسة المدنية

الموضوعات

• الخرسانة المسلحة

عدد الصفحات

250

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-317653