الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 242 |  |  |
| | | from | 242 | | |
Abstract
Columns are considered one of the main structural elements within concrete structures. As they form the main support for other load bearing elements, e.g. beams and slabs. Their collapse during a fire can be detrimental to the stability of the rest of the structure. Consequently, cracking and spalling of concrete columns after a fire exposure are often accompanied with the corrosion of internal steel reinforcement.
The aim of this work is to investigate the efficiency of using ferrocement confinement in repairing heated RC columns. In order to do that an experimental and numerical studies were carried out to investigate the behaviour of pre and post heated RC short columns wrapped by ferrocement overlays.
An experimental program, ten RC columns of dimensions 150X150X1000 mm were constructed and tested under axial load. The tested columns were divided into unheated columns, post-heated columns; post-heated columns repaired with ferrocement, and heated wrapped columns. All heated columns were heated to a temperature of 300oC for 3 hours.
The finite element software program (ANSYS 13) was used to extend the parametric study to cover other parameters which have not been investigated experimentally A total of 120 extra models analysed to investigate the efficiency of using ferrocement laminates in repairing post-heated RC columns.
The experimental results were utilised for validation of the finite element models developed using ANSYS 13 software package. Based on the experimental and numerical results it is suggested an equation to predict the ultimate load of RC short columns wrapped by ferrocement. The results of the design equation were mutually compared with both the experimental and numerical ones. The research proved that repairing scheme has efficiency in surpassing the failure load of and improved the ultimate strength of heated columns significantly. The ultimate load of post-heated column wrapped by ferrocement is significantly affected by increasing the thickness of the mortar. The ultimate load of post-heated columns reduced down to 45% after exposed to 300 oC for 3 hours. The strength of the post-heated columns repaired with ferrocement overlays was increased by 63% and 41% more than the strength of post-heated column with reference to reinforcement ratio. The results of both the finite element and the prediction equation gave satisfactory agreement with experimental ones.