SOME MAIN FACTORS AFFECTING EFFICIENCY OF EXTERNALLY BONDED PARTIALLY LATERAL WRAPPING CFRP OF AXIALLY SHORT STATIC LOADING PLAIN AND R.C COLUMNS | ||
| JES. Journal of Engineering Sciences | ||
| Article 17, Volume 35, No 5, September and October 2007, Pages 1139-1199 PDF (1.87 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.21608/jesaun.2007.114547 | ||
| Authors | ||
| Abdel Rahman Megahid* 1; Khairy Hassan Abel Kareem1; Omar Ahmed Farghal1; Mahmoud Mohamed El-Taher2 | ||
| 1Civil Engineering Department, faculty of Engineering, Assiut University, Assiut, EGYPT | ||
| 2Consulting Engineer, Supreme Council of Luxor, Luxor, EGYPT | ||
| Abstract | ||
| Plain and reinforcement concrete columns have an important function in the structural concept of many structures. Often, these columns are vulnerable to exceptional loads (such as impact, explosion or seismic loads), load increase (increasing use or change of function of structures, etc.) and degradation (corrosion of steel reinforcement, alkali silica reaction, etc.). On the other hand, confinement of concrete is an efficient technique to enhance the structural behavior of concrete members primarily subjected to compression. Since the introduction of Fiber Reinforced Polymer (FRP) as externally bonded reinforcement confinement by means of Carbon Fiber Reinforced Polymer (CFRP) wrapping has been of considerable interest for the upgrading of columns, piers, chimneys, etc. It may also be necessary to strengthen old RC structures a result of new code equipment or because of damage to the structure of environmental stresses. The efficiency of this strengthening technique depends mainly upon the encountered parameters such as concrete strength, percentage of longitudinal reinforcement, volume of internal stirrup, shape and size of cross-section, volume of wrapped reinforcement and arrangements of wrapped sheets. Therefore, the herein work describes an experimental work of 37 columns to study the behavior of plain and reinforced concrete circular, square and rectangular short axially loaded unconfined and confined columns with externally CFRP wrapping reinforcement. The measured strains in axial direction were recorded at the different axial load levels for the different tested columns and plotted against the corresponding axial stresses comparing the axial stress- axial strain relations of the strengthened columns with that of non-strengthened columns. The program was planned to investigate the effect of size of cross section of columns, shape of cross section and percentage of longitudinal steel of columns, percentage of lateral steel (stirrups) and strengthening system of columns on the confined concrete behavior and the efficiency of such confinement in terms of the induced axial nominal stress, axial nominal strain, the initial modulus of elasticity and the modulus of toughness which represents the area under stress-strain curve and the percentage of increase of modulus of toughness . | ||
| Keywords | ||
| Carbon Fiber Reinforced Polymer (CFRP); wrapping; strengthening; efficiency; plain and reinforced short columns | ||
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