الفهرس 
صفحة العنوان باللغة الانجليزيةOnly 14 pages are availabe for public view
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Abstract
Columns are very important structural elements because they are the main supporting elements in RC structures.in some cases the desire to change the activity of the concrete structure causes an increase in the loads on the structure . Recently new materials have been developed to enhance the performance of these structural elements. In this research, the square and rectangular concrete columns were strengthened using basalt fibers and compared to glass and carbon fibers.
The practical program was conducted on eleven column specimen divided into three groups; all specimens have the same height of 1200 mm with different cross sections.
The first group consisted of seven specimens with cross section 150 * 150 mm two specimens were strengthened by basalt fibers the first was partially strengthened using basalt fiber of 100 mm width and the second was fully strengthened , and two specimens were strengthened by glass fiber the first was partially strengthened using glass fiber of 100 mm width and the second was fully strengthened and two specimens were strengthened by carbon fiber the first was partially strengthened using carbon fiber of 100 mm width and the second was fully strengthened and the final specimen is the control .
The second group consisted of two specimens with cross section 150 * 200 mm both specimens were strengthened by basalt fibers the first was partially strengthened using basalt fiber of 100 mm width and the second was fully warped.
The third group consisted of two specimens with cross section 150 * 300 mm both specimens were strengthened by basalt fibers the first was partially strengthened using basalt fiber of 100 mm width and the second was fully strengthened.
Test results show that confining of the R. C. columns using different Types of strengthening results in significant improvement of the general behavior of the columns. Wrapping using BFRP, CFRP & GFRP enhances ductility and ultimate strength as well; the theoretical results had been calculated according to the ECP equation and compared to the experimental results. Through the practical study, it is clear that there is an improvement in the column capacity and behavior of all strengthened columns by basalt fiber, glass and carbon compared to the unstrengthen columns. The results in this study show that reinforced concrete columns strengthened by carbon fiber is more effective by increase the capacity of the column than the basalt fiber and the glass fiber. But by considering the lower cost of glass fiber compared to basalt and carbon, it can be said that it gives good results.