M. Ahmed, A., Hassan Abdel kareem, K., K. Idriss, L. (2007). SOME FACTORS AFFECTING THE AXIAL STATIC BEHAVIOR OF HIGH STRENGTH SHORT REINFORCED CONCRETE COLUMNS-THEORETICAL APPROACH. JES. Journal of Engineering Sciences, 35(No 5), 1201-1233. doi: 10.21608/jesaun.2007.114550
Abdel Rahman M. Ahmed; Khairy Hassan Abdel kareem; Lamiaa K. Idriss. "SOME FACTORS AFFECTING THE AXIAL STATIC BEHAVIOR OF HIGH STRENGTH SHORT REINFORCED CONCRETE COLUMNS-THEORETICAL APPROACH". JES. Journal of Engineering Sciences, 35, No 5, 2007, 1201-1233. doi: 10.21608/jesaun.2007.114550
M. Ahmed, A., Hassan Abdel kareem, K., K. Idriss, L. (2007). 'SOME FACTORS AFFECTING THE AXIAL STATIC BEHAVIOR OF HIGH STRENGTH SHORT REINFORCED CONCRETE COLUMNS-THEORETICAL APPROACH', JES. Journal of Engineering Sciences, 35(No 5), pp. 1201-1233. doi: 10.21608/jesaun.2007.114550
M. Ahmed, A., Hassan Abdel kareem, K., K. Idriss, L. SOME FACTORS AFFECTING THE AXIAL STATIC BEHAVIOR OF HIGH STRENGTH SHORT REINFORCED CONCRETE COLUMNS-THEORETICAL APPROACH. JES. Journal of Engineering Sciences, 2007; 35(No 5): 1201-1233. doi: 10.21608/jesaun.2007.114550
SOME FACTORS AFFECTING THE AXIAL STATIC BEHAVIOR OF HIGH STRENGTH SHORT REINFORCED CONCRETE COLUMNS-THEORETICAL APPROACH
Civil Engineering Department, faculty of Engineering, Assuit University
Abstract
In this study, non-linear three dimensional finite element model was utilized to study the confinement of high strength reinforced concrete short columns under axial static loading. The accuracy of the model was verified experimentally in Japan. The parameters affecting the degree of confinement of columns are: grade and quality of used concrete, grade and quality of used main longitudinal reinforcement, presence of longitudinal reinforcement, type of acting load (static or repeated loading), and rate of loading, eccentricity of applied compressive load, slenderness ratio, end condition, concrete cover, shape and size of crosssection, presence of lateral loading, presence of shear stress on columns, confinement of concrete and its factor of efficiency, type and strength of confinement material, volumetric ratio of confining steel and confining reinforced configuration. The current research is focusing on the effect of following parameters upon the static behavior of axial short columns: shape of cross-section either circular, rectangular and square, end boundary condition (fixed-fixed, hinged-hinged, fixed-hinged and fixedfree), volumetric ratio of confinement s as: 0, 1.023%, 1.6225%, and 2.70%, and grade of concrete either, fcu = 300, 600, 900 kg/cm2 . The obtained theoretical results are; the axial stress (fcc)–axial strain (cc) relationship, the lateral stress (fcl)–axial strain (cc) relationship, the axial stress (fcc)–lateral strain (cl) relationship, the axial stress (fcc)– lateral stress (fcl) relationship and the axial stain (cc) –lateral strain (cl) relationship. From the results of the study, it was declared how the previous included parameters are affecting the axial static behavior of confined high strength R.C short columns. For different volumetric ratios, the strength ratios (fcc/fcu, fcl/fcc, fcl/fcu) increases with increase of volumetric ratio (s) and the highest strength for circular columns than rectangular columns than that for square columns. Also, the strength ratios decrease with increase grade of concrete (fcu). For different end condition, the highest strength ratios for square columns at (fixed-fixed) end condition than for circular columns than for square columns both at (hinged-hinged) end condition.
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