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Item type:Publication, Access status: without files , Recommendations for design against disproportionate collapse of structures : report of the terminology and procedures Sub-Committee (SC1)(American Society of Civil Engineers (ASCE), 2011); ; ; ; The ASCE SEI Committee on Disproportionate Collapse Standards and Guidance is developing a guidance document for design against disproportionate collapse of structures. A Terminology and Procedures Sub-Committee was created to focus on definitions of terms and to develop a conceptual framework. The Sub-Committee prepared a draft that was discussed and accepted in principle by the Committee at its meeting on 13 May 2010. The draft is published here in its latest but shortened version for rapid dissemination and discussion. The complete draft is available on request. The draft starts with a comprehensive and consistent set of definitions of relevant terms such as collapse resistance, robustness, vulnerability, exposure, direct design, indirect design, threat-specific design, non-threat-specific design, and many more, which up to now have not been consistently defined and used. These definitions are strongly cross-referenced and a hierarchical system of interrelated definitions thus emerges. On this basis, a conceptual framework of design criteria comprising design requirements, design objectives, design methods, and verification procedures is developed. This framework will serve as the outline for the Committee's design guidance document. Specific content for a number of sections and an appendix still need to be developed by dedicated Sub-Committees (SC). These tasks are clearly defined by the framework. The draft consists of recommendations and commentary. In the following, recommendations are set in normal font and commentary in italics. The section numbering of the draft is substantial to cross-referencing and thus retained. Specific content still to be developed by dedicated Sub-Committees is indicated in brackets. Numbers given in tables are intended to illustrate the possible final content of these tables and to stimulate discussion. They should be understood as placeholders for the final content to be specified by the respective Sub-Committee. © ASCE 2011.Publicationtype: Conference Paper24 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Implementation of a multiagent-based paradigm for decentralized real-time structural health monitoring(American Society of Civil Engineers (ASCE), 2011-04); ; Engineering structures such as wind turbines require continuous monitoring to ensure structural safety, to reduce the overall maintenance and repair costs and, ultimately, to achieve extended lifetimes and a greater economic viability. For that purpose, an automated SHM system for wind turbines has been developed and installed on a 500 kW wind turbine in Germany. During its operation, temporary malfunctions of the installed sensing units have been observed. These malfunctions, such as temporary sensor breakdowns which are well known from real-time SHM systems, might cause the loss of valuable monitoring data if not detected timely. A multi-agent system, which is capable of self-detecting system malfunctions and notifying the human individuals automatically, has been developed and integrated into the existing SHM system. The SHM system and its subsystem, the multi-agent system, have been in continuous operation since 2009. Since then, various malfunctions have automatically been detected and appropriate actions have been taken in a timely manner. As a result, the malfunctioning of the sensors did not lead to significant data loss, thus enhancing the quality of the SHM system.Publicationtype: Conference Paper17