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A platform for research: civil engineering, architecture and urbanism
Confinement effectiveness in rectangular concrete columns with fiber reinforced polymer wraps
Confining wraps to rehabilitate and reinforce existing concrete columns are most efficient when applied to circular columns. They are much less effective when applied to rectangular columns. In rectangular columns, little or no increase in the concrete peak stress is observed with reference to unconfined concrete indicating that little or no confining stresses have developed. Most of the improvement is observed postpeak in the form of increased ductility and ultimate strength. In this paper an innovative mechanical model is presented then a numerical finite element model representing a two-dimensional slice is developed with refined meshing in order to capture the stress concentration at the corners as well as the stress distribution in the croass section of the FRP wrapped columns. The following can be noted: The parameters controlling the geometric confinement efficiency are the cross-section shape factor and the corner sharpness factor and and to a much lesser extent the confinement stiffness factor. Stress concentrations that develop at the corners of passivey confined rectangular cross sections are responsible for the reduction of effectiveness, and cause localization failure. The confinement effectiveness decreases linearly with the increase in corner sharpness factor and the confinement effectivenesss decreases with the decrease in the cross-section shape factor of the increase in the rectangularity of the cross section.
Confinement effectiveness in rectangular concrete columns with fiber reinforced polymer wraps
Confining wraps to rehabilitate and reinforce existing concrete columns are most efficient when applied to circular columns. They are much less effective when applied to rectangular columns. In rectangular columns, little or no increase in the concrete peak stress is observed with reference to unconfined concrete indicating that little or no confining stresses have developed. Most of the improvement is observed postpeak in the form of increased ductility and ultimate strength. In this paper an innovative mechanical model is presented then a numerical finite element model representing a two-dimensional slice is developed with refined meshing in order to capture the stress concentration at the corners as well as the stress distribution in the croass section of the FRP wrapped columns. The following can be noted: The parameters controlling the geometric confinement efficiency are the cross-section shape factor and the corner sharpness factor and and to a much lesser extent the confinement stiffness factor. Stress concentrations that develop at the corners of passivey confined rectangular cross sections are responsible for the reduction of effectiveness, and cause localization failure. The confinement effectiveness decreases linearly with the increase in corner sharpness factor and the confinement effectivenesss decreases with the decrease in the cross-section shape factor of the increase in the rectangularity of the cross section.
Confinement effectiveness in rectangular concrete columns with fiber reinforced polymer wraps
Die Wirksamkeit einer Umhüllung von rechteckigen Betonpfeilern mit faserverstärktem Kunststoff
Karam, Gebran (author) / Tabbara, Mazen (author)
Journal of Composites for Construction ; 9 ; 388-396
2005
9 Seiten, 12 Bilder, 26 Quellen
Article (Journal)
English
Confinement Effectiveness in Rectangular Concrete Columns with Fiber Reinforced Polymer Wraps
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| British Library Conference Proceedings | 2002