Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Tests on seismically damaged reinforced concrete walls repaired and strenghtened using fiber-reinforced polymers
The present experimental program focuses on the seismic response of RC walls that were initially loaded to failure and subsequently 'conventionally' repaired by the replacement of heavily damaged concrete by a high-strength mortar and lap welding of fractured reinforcement in the plastic hinge region, and then strengthened by wrapping of the walls with FRP jackets, as well as addition of FRP strips at the wall edges, to enhance both flexural and shear capacity. The FRP sheets used for strengthening the walls were either GFRP (glassfiber reinorced polymer) or CFRP (carbon fiber reinforced polymer) with fibers in one direction. Among the anchorage systems the most efficient was the one based on a combination of GFRP inverted U-sections, GFRP anchors, and a rather thick steel plate to strengthen the horizontal leg of the U-section. By using FRP jackets, the shear strength of RC (reinforced concrete) walls subjected to seismic loads can be increased, and, in addition, shear cracking is effectively controlled. Stiffness of the strengthened specimens, after the point of yielding, was on the average 15 % higher than of the original specimens. In all tests, final failure of the FRP anchorage is brittle, but only occrs after the peak strength is attained and typically follows fracture of steel reinforcemet in critical areas.
Tests on seismically damaged reinforced concrete walls repaired and strenghtened using fiber-reinforced polymers
The present experimental program focuses on the seismic response of RC walls that were initially loaded to failure and subsequently 'conventionally' repaired by the replacement of heavily damaged concrete by a high-strength mortar and lap welding of fractured reinforcement in the plastic hinge region, and then strengthened by wrapping of the walls with FRP jackets, as well as addition of FRP strips at the wall edges, to enhance both flexural and shear capacity. The FRP sheets used for strengthening the walls were either GFRP (glassfiber reinorced polymer) or CFRP (carbon fiber reinforced polymer) with fibers in one direction. Among the anchorage systems the most efficient was the one based on a combination of GFRP inverted U-sections, GFRP anchors, and a rather thick steel plate to strengthen the horizontal leg of the U-section. By using FRP jackets, the shear strength of RC (reinforced concrete) walls subjected to seismic loads can be increased, and, in addition, shear cracking is effectively controlled. Stiffness of the strengthened specimens, after the point of yielding, was on the average 15 % higher than of the original specimens. In all tests, final failure of the FRP anchorage is brittle, but only occrs after the peak strength is attained and typically follows fracture of steel reinforcemet in critical areas.
Tests on seismically damaged reinforced concrete walls repaired and strenghtened using fiber-reinforced polymers
Versuche mit durch Erdbeben beschädigte und mit faserverstärkten Kunststoffen reparierte und verstärkte Betonwände
Antoniades, Konstantinos K. (Autor:in) / Salonikios, Thomas N. (Autor:in) / Kappos, Andreas J. (Autor:in)
Journal of Composites for Construction ; 9 ; 236-246
2005
11 Seiten, 12 Bilder, 1 Tabelle, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
tragende Mauer , Stahlbeton , Beschädigung , Erdbeben , Reparatur , Verstärkung (Festigkeit) , Platte (Halbzeug) , glasfaserverstärkter Kunststoff , carbonfaserverstärkter Kunststoff , Laminat , Retrofitting , Scherfestigkeit , Biegefestigkeit , Festigkeitserhöhung , Hysterese , Verankerung (mechanische Befestigung) , Ummantelung
| British Library Online Contents | 2010
| British Library Online Contents | 2005