Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Seismic rehabilitation of deficient exterior concrete frame joints
Recent earthquakes tested the vulnerability of existing RC (reinforced concrete) structures to strong ground motions. Beam-column joints were identified as a weak link in existing RC moment-resisting frames. The objective of this experimental study is to develop and test effective rehabilitation systems to upgrade the resistance to bondslip of the bottom steel bars anchored in the joint zone and to upgrade the shear resistance of beam-column joints. A GFRP (glass fiber reinforced polymer) jacket of the joint zone was found to be an effective system to provide confinement and shear strength to shear-deficient joints. Brittle joint shear failure was avoided, and ductile beam flexural hinging instead developed. CFRP (carbon fiber reinforced polymer) sheets attached to the beam bottom face were found effective in replacing the anchorage-deficient beam bars, when an adequate anchorage system of these sheets is provided. These sheets were capable of carrying high-tensile and compressive forces. External steel tie-rods welded to the existing deficient beam reinforcement were found to be a simple and effective technique to improve the anchorage conditions of these bars.
Seismic rehabilitation of deficient exterior concrete frame joints
Recent earthquakes tested the vulnerability of existing RC (reinforced concrete) structures to strong ground motions. Beam-column joints were identified as a weak link in existing RC moment-resisting frames. The objective of this experimental study is to develop and test effective rehabilitation systems to upgrade the resistance to bondslip of the bottom steel bars anchored in the joint zone and to upgrade the shear resistance of beam-column joints. A GFRP (glass fiber reinforced polymer) jacket of the joint zone was found to be an effective system to provide confinement and shear strength to shear-deficient joints. Brittle joint shear failure was avoided, and ductile beam flexural hinging instead developed. CFRP (carbon fiber reinforced polymer) sheets attached to the beam bottom face were found effective in replacing the anchorage-deficient beam bars, when an adequate anchorage system of these sheets is provided. These sheets were capable of carrying high-tensile and compressive forces. External steel tie-rods welded to the existing deficient beam reinforcement were found to be a simple and effective technique to improve the anchorage conditions of these bars.
Seismic rehabilitation of deficient exterior concrete frame joints
Erdbebensichere Verstärkung von unzureichenden, äußeren Verbindungen von Betonrahmen
Ghobarah, A. (Autor:in) / El-Amoury, T. (Autor:in)
Journal of Composites for Construction ; 9 ; 408-416
2005
9 Seiten, 23 Bilder, 1 Tabelle, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
Erdbeben , mechanische Verstärkung , Stahlbetonbau , Verbindungsstelle , Rahmen , Träger (Bauwesen) , Pfeiler , Verankerung (mechanische Befestigung) , Scherfestigkeit , Festigkeitserhöhung , glasfaserverstärkter Kunststoff , carbonfaserverstärkter Kunststoff , Ummantelung , Druckfestigkeit , Rehabilitationstechnik
Seismic Rehabilitation of Deficient Exterior Concrete Frame Joints
| Online Contents | 2005
Seismic Rehabilitation of Deficient Exterior Concrete Frame Joints
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Seismic Rehabilitation of Reinforced Concrete Frame Interior Beam-Column Joints with FRP Composites
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Seismic Performance of Lightly Reinforced Concrete Exterior Beam-Column Joints
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