الفهرس 
DIAGNOSIS AND PROGNOSIS OF DEFECTIVE CONCRETE BIDLDINGSOnly 14 pages are availabe for public view
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Abstract
After the earthquake of 1992, the performance of wide range of concrete
structures that had been built in the 1970s and before was influenced. Therefore, many
researches concentrated on developing proper repairing and retrofitting programs.
Others oriented to the use of new composite materials for rehabilitation process. But,
there is a lack in studying the Safety assessment of these structures and how to prepare
emergency programs.
The present research aims at introducing a rational methodology for assessing
rehabilitation projects, especially those concerning the retrofitting of reinforced concrete
buildings. The traditional methods depend upon subjective assessment of the defective
structures regarding the apparent symptoms of distress (e.g., instability, cracks, and
excessive deflection). Moreover, heuristic (descriptive) method cannot satisfy the
demand for Quantitative determination of the degree of damage or deterioration.
This research focuses on developing the traditional techniques of evaluating
damage of RC structures, suggesting newer techniques for diagnosis and prognosis by
merging both subjective and quantitative assessment of RC buildings. The objectives
can be summarized as;
1- Rationalize the evaluation of the existing defective RC Structures, with a view to
avoiding unnecessary strengthening or replacement of parts that are in practice
adequately safe.2- Develop a methodology for determining a proper level of safety for specified RC
buildings (using an existing civil project as a full scale Model is part of this
, -.
methodology).
3- Develop new mathematical techniques can that satisfy the most common
deterioration mechanisms.
4- Selecting the Appropriate Testing techniques, Survey on the testing equipment
used to investigate Structural Integrity and Safety Assessment of RC
members/structures.
5- Utilizing the progress achieved in Bridge Assessment Techniques in field of RC
buildings.
6- Investigating the validity of well-known stochastic approaches like MCMC and
using both statistical and deterministic methods in life prediction of RC
structures.
Finally, it’s seen how diagnosing RC building through systematic procedure simplifies
the issue, better-enhance the contribution of deterioration agents, commensurate with
well-known theories of evaluating damage, and provide tolerant predictions of building
behavior with the passage of time. More advantages of applying the proposed technique are:
.:. It requires less number of field tests to compromise visual inspection and primary
evaluation of structure .
.:. It correlates syndrornic - aspects of deterioration like correlating the degree of
reinforcement corrosion with concrete surface condition this helps in predicting
past and future behavior of structure. .:. It modifies using heuristic methods, MCMC, by defining specific coefficients of
transformation matrices and not adopting the default coefficients of traditional
matrices .
.:. It considers unforeseen parameters by involving empty set for the unknown
causes in hypotheses set.
.:. The technique is easy to handle, based on active excel sheets that can be modified
to whatever varying parameters; it is applicable when different deterioration
mechanism is introduced .
•:. It can be used in monitoring RC structures to evaluate their performance and
indicate damages or predict their future performance.
Key Words:
RC structures, rehabilitation, retrofitting, assessment, safety, diagnosis, prognosis,
deterioration, scaling, corrosion, strength, interpretation, model, monitoring, repair.