Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Flexural Retrofit of Circular Reinforced Concrete Bridge Columns by Steel Jacketing. Experimental Studies
Collapse or severe damage of a number of California Bridges in recent moderate earthquakes has emphasized the need to develop effective retrofit measures to enhance the flexural strength and ductility, as well as the shear strength, of bridge columns designed before current seismic design provisions were implemented. This report presents the results of an experimental study in which the potential plastic hinge region of circular bridge columns is encased with a steel jacket for enhanced flexural performance. Results from large-scale column tests showed that the steel jacket acts efficiently as confinement reinforcement, enabling column ductilities exceeding those designed with current codes to be achieved. The jackets also inhibits bond failure in the lap-splices of the longitudinal reinforcement by restraining the dilation and spalling of the cover concrete which would otherwise precipitate rapidly degrading bond failures. Steel jacketing is also effective for post-earthquake repair of columns which have suffered bond failure at the lap-splices of the longitudinal reinforcement. The tests identified brittle shear failure at the footing/column joint as a potential failure mechanisms for old footing designs.
Flexural Retrofit of Circular Reinforced Concrete Bridge Columns by Steel Jacketing. Experimental Studies
Collapse or severe damage of a number of California Bridges in recent moderate earthquakes has emphasized the need to develop effective retrofit measures to enhance the flexural strength and ductility, as well as the shear strength, of bridge columns designed before current seismic design provisions were implemented. This report presents the results of an experimental study in which the potential plastic hinge region of circular bridge columns is encased with a steel jacket for enhanced flexural performance. Results from large-scale column tests showed that the steel jacket acts efficiently as confinement reinforcement, enabling column ductilities exceeding those designed with current codes to be achieved. The jackets also inhibits bond failure in the lap-splices of the longitudinal reinforcement by restraining the dilation and spalling of the cover concrete which would otherwise precipitate rapidly degrading bond failures. Steel jacketing is also effective for post-earthquake repair of columns which have suffered bond failure at the lap-splices of the longitudinal reinforcement. The tests identified brittle shear failure at the footing/column joint as a potential failure mechanisms for old footing designs.
Flexural Retrofit of Circular Reinforced Concrete Bridge Columns by Steel Jacketing. Experimental Studies
Y. H. Chai (Autor:in) / M. J. N. Priestley (Autor:in) / F. Seible (Autor:in)
1991
172 pages
Report
Keine Angabe
Englisch
Highway Engineering , Bridge design , Retrofitting , Columns(Supports) , Reinforcement(Structures) , Earthquake resistant structures , Reinforced concrete , Buckling , Earthquake engineering , Reinforcing materials , Highway bridges , Ductility , Bridge maintenance , Earthquake damage , Highway maintenance , Flexural strength , Bending moments , Deflection , Design analysis , Structural analysis , Structural steels , Circular bodies
Steel Jacketing of Bridge Columns for Enhanced Flexural Performance
| British Library Conference Proceedings | 1990
Seismic retrofit of square reinforced concrete columns using composite jacketing
| British Library Conference Proceedings | 2007