UNCERTAINTIES AND RELIABILITY ANALYSIS OF REINFORCED CONCRETE FOLDED PLATES
Publication Date : 01/02/2017
The study presents reliability assessment of reinforced concrete folded plates with deterministic and stochastic design carried out in accordance with Eurocode 2. This was based on the First Order Reliability Method (FORM) using FORM 5. Limit state equations for reinforced concrete folded plate subjected to bending, longitudinal stress and deflection were derived and their implied reliability levels evaluated. All basic design variables involved are treated as random variables with their statistical characteristics adopted from the literature. The results showed that safety index decreases with increase in load ratio which was as a result of diminishing strength and largely depends on their variable parameters. It was also observed that both bending and longitudinal stress are safe at load ratio of 0.1 to 0.6 with safety indices ranging from 3.20 to 4.26 and probability of failure of 10-5 while it becomes critical at load ratio of 0.8 to 1.0 which correspond to safety indices of 2.51 to 2.84. For deflection mode of failure, the structure is safe at all load ratio. The reliability assessment of the folded plate structure is unavoidable in order to ensure safety and minimum investment in design and construction.
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