الفهرس 
CAUSES OF BUILDING DEFECTSOnly 14 pages are availabe for public view
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Abstract
During the last lew decades many defects appeared in reinforced concrete structures as
well as in bearing walls structures. There is a great number of methods of repair of these
defect but defects arc repeated greatly. So this thesis is made a trail to collect the available
causes of detects and also the methods of repair and then make a judging criterion for each
of them.
The thesi is divided into two separated parts as followed:
ParI (I) : Reinforced Concrete Structure:
The aim of the research in this part is to study and collect the different causes ofthe
building dcfecis , failures. repairing methods .and surveying for the technical reports and
the available researches work carried out in this tield and change it to a flow chart to have
judging ccrtcriation for each case.
Part (11) : Uearing Walls Buildings:
The aim of research in this part is to study the different cause of building defects.
failure, repairing method, also surrey for the technical reports and the available research
work carried out in this field.
Also as a trail to lind new methods of repair. an experimental work to determine the
effectiveness of FRI’ laminates as a repairing technique for unreinfrced solid masonry shear
walls built from red brick was carried out.
To meet this objective a total of five specimens unreinforced solid masonry walls
fabricated from old red bricks were constructed and tested under combined vertical and
horizontal loads . live walls were tested as plain wall until failure and then four of them
retested after repairing using FRP laminates.
The conclusion from the experimental work are 1- TIle cracking load of the plain specimen is approximately about 40 - 60 % from the
failure load.
2- The maximum compression stress In the wall at the cracking load was
approximately about 22 -35 % of the ultimate strength of the bricks and about 1015
% of the ultimate strength of the mortar .
3- The maximum compression stress in the wall at the failure load was approximately
about 50-60 % of the ultimate strength of the bricks and about 20-25 % of the
ultimate strength of the mortar.
4- The: cracks always took place through the bricks and not through the mortar joint
( that may be because the mortar is stronger than the bricks) .
5- The FRP laminates increased the internal deformations of the repaired walls
dramatically which demonstrates the efficiency of the FRP in increasing the
ductility of the wall ).
6- The load capacity of the repaired specimens is less than that of the plain walls by
4 - 10 % . It can be said that using FRP laminates as a repairing method returned the
repaired wall to its original capacity.
7- Using FRP as a repairing method prevents any sudden collapse or failure of the
non reinforced bearing walls (which some times is the main cause of many death
cases)