Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Behavior of Un-Bonded Post-Tensioned Beams Repaired and Retrofitted with Composite Materials
The interactive behavior of un-bonded post-tensioned structural components, when repaired and retrofitted with composite materials, is not yet properly understood (both short and long term). The current research is done to understand this subject. Eleven 12'-0" long beams B1 thru B11, were loaded to reach close to their ultimate values. As the beams got noticeably cracked, or the deflections reached twice the allowable deflection, or the post-tensioning forces reached critical values, the beams were unloaded. The cracked beams were repaired with varying amount of composite materials (carbon and e-glass) adhesives, and tested again. The tests were stopped based on the same three criteria stated above. Various repairing schemes were adopted. Attempt was made to find the minimum usages of the composite materials, prevent diagonal shear cracking (by providing shear patches), and sudden compression failures (by confinement). The changes in post-tensioning forces at ultimate stage, effects of having mild steel in the tension zone, and crack propagations were recorded and reported. The load carrying capacities and the deflections of the retrofitted and repaired beams were compared with that of the original un-cracked beams. The repair work was extended to continuous post-tensioned beams. Photographs of two-span post-tensioned beams (total span 30-0") are shown in the appendix.
Behavior of Un-Bonded Post-Tensioned Beams Repaired and Retrofitted with Composite Materials
The interactive behavior of un-bonded post-tensioned structural components, when repaired and retrofitted with composite materials, is not yet properly understood (both short and long term). The current research is done to understand this subject. Eleven 12'-0" long beams B1 thru B11, were loaded to reach close to their ultimate values. As the beams got noticeably cracked, or the deflections reached twice the allowable deflection, or the post-tensioning forces reached critical values, the beams were unloaded. The cracked beams were repaired with varying amount of composite materials (carbon and e-glass) adhesives, and tested again. The tests were stopped based on the same three criteria stated above. Various repairing schemes were adopted. Attempt was made to find the minimum usages of the composite materials, prevent diagonal shear cracking (by providing shear patches), and sudden compression failures (by confinement). The changes in post-tensioning forces at ultimate stage, effects of having mild steel in the tension zone, and crack propagations were recorded and reported. The load carrying capacities and the deflections of the retrofitted and repaired beams were compared with that of the original un-cracked beams. The repair work was extended to continuous post-tensioned beams. Photographs of two-span post-tensioned beams (total span 30-0") are shown in the appendix.
Behavior of Un-Bonded Post-Tensioned Beams Repaired and Retrofitted with Composite Materials
Chakrabari, P. R. (Autor:in)
Structures Congress 2005 ; 2005 ; New York, New York, United States
Structures Congress 2005 ; 1-11
18.04.2005
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Behavior of Un-Bonded Post-Tensioned Beams Repaired and Retrofitted with Composite Materials
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