Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of damage evolution under repeated loading of post-tensioned concrete beams by acoustic emission
Recent collapses of bridges have demonstrated once again the need for reliable tools for an early monitoring of damage progression. Damages due to deterioration processes, overload, bad design, poor material quality, can grow subcritically until final collapse of the structure. AE method has been successful used for more than 20 years in industry for monitoring metal equipments (pipelines, pressure vessels, gas tanks, etc.) and the technology is quite mature. The application of the AE technique in the civil engineering requires however the overtaking of several problems related to structure complexity, material non homogeneity and the high attenuation factor for high frequency acoustic waves in concrete, environmental noise. A great effort was however done in the last ten years on data handling and data interpretation. Aim of the paper was to develop monitoring procedures based on the collection and analysis of Acoustic Emission signal to be applied on prestressed concrete structures to evaluate damage progression due to deterioration or overloading. Laboratory experimentation included the fabrication of full scale post tensioned beams 6.3 meters long with partially grouted post tensioning ducts. Voids were filled with aggressive solution in order to promote strands corrosion or stress corrosion cracking. Beams were then tested under increasing static load up to incipient failure. Different type of analysis methods of AE signal have been adopted and compared.
Evaluation of damage evolution under repeated loading of post-tensioned concrete beams by acoustic emission
Recent collapses of bridges have demonstrated once again the need for reliable tools for an early monitoring of damage progression. Damages due to deterioration processes, overload, bad design, poor material quality, can grow subcritically until final collapse of the structure. AE method has been successful used for more than 20 years in industry for monitoring metal equipments (pipelines, pressure vessels, gas tanks, etc.) and the technology is quite mature. The application of the AE technique in the civil engineering requires however the overtaking of several problems related to structure complexity, material non homogeneity and the high attenuation factor for high frequency acoustic waves in concrete, environmental noise. A great effort was however done in the last ten years on data handling and data interpretation. Aim of the paper was to develop monitoring procedures based on the collection and analysis of Acoustic Emission signal to be applied on prestressed concrete structures to evaluate damage progression due to deterioration or overloading. Laboratory experimentation included the fabrication of full scale post tensioned beams 6.3 meters long with partially grouted post tensioning ducts. Voids were filled with aggressive solution in order to promote strands corrosion or stress corrosion cracking. Beams were then tested under increasing static load up to incipient failure. Different type of analysis methods of AE signal have been adopted and compared.
Evaluation of damage evolution under repeated loading of post-tensioned concrete beams by acoustic emission
Bewertung der Schadensentwicklung unter wiederholter Belastung von nachgespannten Betonbalken mittels Schallemission
Proverbio, Edoardo (Autor:in) / Campanella, Giuseppe (Autor:in) / Venturi, Vincenzo (Autor:in)
2008
7 Seiten, 8 Bilder, 8 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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