Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Continuous acoustic monitoring of bridges
Hidden Corrosion of tensioned-steel elements in bridges is a continuing concern for bridge owners and engineers. In the UK, corrosion of grouted post-tensioned tendons in bridges has led to restrictions of the use of this construction method in new bridges. With cable-stayed and suspension bridges, assessing the condition of the high-strength steel wires in the stays, main cables, or suspender ropes is difficult, intrusive, and expensive. These problems highlight the need for practical and cost-effective methods of assessment. This paper describes the development, testing, and application of a continuous acoustic-monitoring system to detect and locate corrosion-induced failures of tensioned-steel elements in bridges. When a tensioned wire fails, its stored energy is released suddenly, causing a dynamic response in the structure. Other ambient events may also cause a response. The monitoring system utilizes acoustic sensors distributed about a structure that detect the response at different points in the structure. On-site processing of data by the site-based data-acquisition system eliminates most irrelevant ambient activity. Events that meet pre-set criteria are recorded and transmitted over the Internet to a central processing facility where proprietary processing software is used to generate reports summarizing the time, location, and classification of recorded events. Long-term monitoring can provide comprehensive information about the nature and extent of deterioration so that informed management decisions can be made. An evaluation of the system on grouted post-tensioned structures undertaken by the Transport Research Laboratory for the Highways Agency (an agency of the UK Department of the Environment, Transport, and the Regions) is discussed. Case studies presented include the Bronx-Whitestone suspension bridge in New York and the Alex Fraser cable-stayed bridge in Vancouver, British Columbia.
Continuous acoustic monitoring of bridges
Hidden Corrosion of tensioned-steel elements in bridges is a continuing concern for bridge owners and engineers. In the UK, corrosion of grouted post-tensioned tendons in bridges has led to restrictions of the use of this construction method in new bridges. With cable-stayed and suspension bridges, assessing the condition of the high-strength steel wires in the stays, main cables, or suspender ropes is difficult, intrusive, and expensive. These problems highlight the need for practical and cost-effective methods of assessment. This paper describes the development, testing, and application of a continuous acoustic-monitoring system to detect and locate corrosion-induced failures of tensioned-steel elements in bridges. When a tensioned wire fails, its stored energy is released suddenly, causing a dynamic response in the structure. Other ambient events may also cause a response. The monitoring system utilizes acoustic sensors distributed about a structure that detect the response at different points in the structure. On-site processing of data by the site-based data-acquisition system eliminates most irrelevant ambient activity. Events that meet pre-set criteria are recorded and transmitted over the Internet to a central processing facility where proprietary processing software is used to generate reports summarizing the time, location, and classification of recorded events. Long-term monitoring can provide comprehensive information about the nature and extent of deterioration so that informed management decisions can be made. An evaluation of the system on grouted post-tensioned structures undertaken by the Transport Research Laboratory for the Highways Agency (an agency of the UK Department of the Environment, Transport, and the Regions) is discussed. Case studies presented include the Bronx-Whitestone suspension bridge in New York and the Alex Fraser cable-stayed bridge in Vancouver, British Columbia.
Continuous acoustic monitoring of bridges
Kontinuierliche akustische Überwachung von Brücken
Elliott, J.F. (Autor:in)
Corrosion Prevention and Control ; 47 ; 67-73
2000
7 Seiten, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
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