الفهرس 
Chapter One: IntroductionOnly 14 pages are availabe for public view
 |  | from | 154 |  |  |
| | | from | 154 | | |
Abstract
Steel concrete composite structures are widely used in many structural applications such as beams, slabs, walls and columns. Composite structures provide not only great reduction for the element size and weight but also high structural efficiency. Because of, the little data and discrepancy between the R.C. and steel Egyptian codes of practice, an experimental and theoretical investigation were conducted to study the behaviour of the composite columns which made from high strength concrete and confinement with external steel box and one layer from Carbon Fiber Reinforcement Polymer (CFRP). The experimental program is performed through design mix of H.S.C to obtain on Fcu 650 and 980 kg/cm2 and eight columns (R.C and Composite) were tested under axial compression force. The experimental variables are the shape of cross section of column (square and rectangle), grade of concrete (650 and 980 kg/cm2), and type of confinement (steel box and CFRP). A dual approach of complementing the experimental results with using ANSYS nonlinear finite element models the verification of the program was done using the experimental date. Also, the experimental and theoretical ultimate loads were compared with the empirical values from the Egyptian Code of Practice (E.C.P) for Concrete, Steel and Polymers. The parametric study was planned using ANSYS nonlinear finite element models are adopted where more variables not included in the experimental program. the parametric study was planned to study the effect of nails connectors on behaviour of composite columns with using steel box, effect of confinement the columns by steel box on the concrete strength, and the effect of changing the composite section from full steel box to strips which been installed on different length and different spacing.