Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Behavior of Hollow Reinforced Concrete Columns Strengthened with Glass Fiber Reinforced Polymer
This research work presents experimental and numerical investigations of behavior of square hollow reinforced concrete columns (RC) strengthened with glass fiber reinforced polymer (GFRP) subjected to axial compressive load. Experimental program consisted of tests on twelve (12) as-built and GFRP strengthened reinforced concrete columns whereas further numerical investigation was performed using ANSYS nonlinear finite element software program on influential parameters such as number of fiber layer of one, two and three; fiber orientation of 0o, 45o, 60o and 90o; loading positions concentric and eccentric; and column cross sectional opening size effects were thoroughly studied. Longitudinal cutouts and eccentricities significantly reduce the load capacity and ductility whereas the edge of opening experiences high stress concentration due to uneven distribution of pressure. 6.3% of cross sectional area reduced 25.8 % and 28.2% columns capacity from experimental and numerical results respectively. For eccentric loading 90o fiber orientation has good performance to prevent primary crack failure in the tensile face of columns. Multi-layer GFRP composite wrapping of square reinforced concrete column offered significant enhancement both in strength and ductility. Specimens wrapped with three fiber layers oriented in hoop direction registered good strength than other specimens. Fibers oriented in hoop direction with single, double and triple layer enhanced 10.36% 16.4% and 20.9% columns capacity respectively. As-built RC columns failure mode were spalling of concrete cover earlier and buckling of longitudinal reinforcement whereas use of GFRP composites delayed spalling of concrete cover and buckling of longitudinal bars leads to strength and ductility improvement.
Behavior of Hollow Reinforced Concrete Columns Strengthened with Glass Fiber Reinforced Polymer
This research work presents experimental and numerical investigations of behavior of square hollow reinforced concrete columns (RC) strengthened with glass fiber reinforced polymer (GFRP) subjected to axial compressive load. Experimental program consisted of tests on twelve (12) as-built and GFRP strengthened reinforced concrete columns whereas further numerical investigation was performed using ANSYS nonlinear finite element software program on influential parameters such as number of fiber layer of one, two and three; fiber orientation of 0o, 45o, 60o and 90o; loading positions concentric and eccentric; and column cross sectional opening size effects were thoroughly studied. Longitudinal cutouts and eccentricities significantly reduce the load capacity and ductility whereas the edge of opening experiences high stress concentration due to uneven distribution of pressure. 6.3% of cross sectional area reduced 25.8 % and 28.2% columns capacity from experimental and numerical results respectively. For eccentric loading 90o fiber orientation has good performance to prevent primary crack failure in the tensile face of columns. Multi-layer GFRP composite wrapping of square reinforced concrete column offered significant enhancement both in strength and ductility. Specimens wrapped with three fiber layers oriented in hoop direction registered good strength than other specimens. Fibers oriented in hoop direction with single, double and triple layer enhanced 10.36% 16.4% and 20.9% columns capacity respectively. As-built RC columns failure mode were spalling of concrete cover earlier and buckling of longitudinal reinforcement whereas use of GFRP composites delayed spalling of concrete cover and buckling of longitudinal bars leads to strength and ductility improvement.
Behavior of Hollow Reinforced Concrete Columns Strengthened with Glass Fiber Reinforced Polymer
Amha Mamo Zenamarkos (Autor:in)
30.07.2020
doi:10.20372/nadre/19714
Hochschulschrift
Elektronische Ressource
Englisch
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