Probabilistic resilience assessment of structures considering the functional uncertainty: A case study for external prestressed subframe in strengthening
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引用次数: 0
Abstract
Seismic resilience is a critical index in the earthquake engineering. In recent years, it has received extensive attention and has been broadly used in post-earthquake assessments, especially for the structures after strengthening. At this stage, the seismic resilience is commonly analyzed using deterministic approaches, while the corresponding probabilistic resilience assessment still needs further research. In this paper, a probabilistic resilience assessment framework of structures considering the functional uncertainty is proposed, and a case study for external prestressed subframe in seismic strengthening is performed. The probabilistic resilience assessment framework consists of the probabilistic analyses of fragility, expected loss, residual functionality, recovery time and resilience index, and the resilience developments along with the intensity level or recovery time are detailedly discussed in the procedure. Subsequently, an implementary example of the existing frame strengthened by an external prestressed subframe is given, and the proposed probabilistic resilience assessment framework is performed for comprehensive analyses. In general, the functionality varying with recovery time presents significant uncertainty for each scenario and intensity level, which proves the necessity of resilience analyses in a probabilistic way. With the increase of prestress level, the obtained mean resilience index increases, and the resilience exceeding probability curves move upward for all the conditions, which signifies the superiority of a higher prestress level to increase the seismic resilience and to improve the risk-resistant capacity in external strengthening. In a sense, the probabilistic resilience assessment framework evaluates the resilience development from an uncertain perspective, which provides a significant reference for the subsequent probabilistic risk analyses in engineering structures.
期刊介绍:
Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed.
The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering.
Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels.
Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.