الفهرس 
ABSTRACT
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Abstract
The use of high-strength concrete (HSC) has been widely accepted by designers and contractors in reinforced concrete structures, especially heavily loaded column of high-rise building and bridges. More data obtained from testing of high strength concrete columns are needed to achieve a better understanding of the strength and deformability of high- strength reinforced concrete columns An experimental program carried out to study strength and deformability of high-strength reinforced concrete columns subjected to eccentric loading. The main variables included in
this test program were longitudinal and lateral reinforcement ratios, concrete compressive
strength, slenderness and rectangularity ratios. Fifteen columns were tested with an overall heights of 1000, 1250 and 1500 mm with effective height of 700 mm, 450 mm and 200 mm
with cross-sections of 150 250 mm, 150 200 mm and 150150 mm at the mid-section and connected with two end cantilevers to apply the eccentric loading and prevent boundary effects. Cubic concrete compressive strength ranged from 36.0 to 75.0 MPa, longitudinal reinforcement ratios were 0.82, 1.25 and 1.73% and lateral reinforcement ratios 0.9, 0.95 1.63 and 2.48% were considered. The tested columns have slenderness ratios ranged from 6.67 to 10.0 and load eccentricity ratios zero, 0.2, 0.5 and 0.8 of column depth. Also analytical study was carried out to calculate the tested columns capacities by using both ACI
318R-14 and ECP 203-07 codes. The comparison of experimental results with analytical study according to both ACI 318R-14 and ECP 203-07 codes were made The experimental results indicated that increasing concrete compressive strength rectangularity ratio and longitudinal reinforcement ratio led to increasing column strength capacity, while decreasing mid-height deformations. Also increasing lateral reinforcement
ratio resulted in pronounced increasing in both column strength capacity and column midheight
deformations. On the other hand increasing load eccentricity or slenderness ratio resulted in obvious decreasing in column strength capacity while increasing column midheight deformations The comparison between experimental and analytical study indicated.