Life Cycle Vulnerability Assessment of Masonry Infilled Steel Frame Structures

Abstract eng:
In this study, the anticipated cost throughout a structure’s operational period has been estimated, following a life cycle model. A scenario has been defined in order to assess the structural performance of a mid-rise infilled steel frame over its expected lifetime. Since the characteristics of the index building play a critical role in estimating the losses, the one selected is designed and modelled based on common existing residential buildings. The life cycle cost of the index building has been estimated by considering progressive deterioration due to aging of the structure (e.g. corrosion, fatigue) and also cumulative damage caused by extreme sudden events (e.g. earthquake, hurricane, flood, blast, etc.). The adapted model is capable of considering the initial construction cost along with the cost of damage and failure consequences including death and injuries, as well as discounting cost over time. The performance of the index building at different life stages has been assessed by implementing incremental dynamic analysis (IDA). Using the obtained results, the exceedance probabilities required for the cost analysis are calculated by means of fragility curves for multiple damage limit states. Furthermore, the limit states’ exceedance frequencies are obtained by convolving fragilities with site a specific hazard curve. Having a good understanding of the structural behavior and its expected cost forecast can be beneficial as a decision making tool for planning and allocating financial resources in case of both pre- and post- disaster.

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