Journal of the South African Institution of Civil Engineers | |
Risk-based member reliability in structural design | |
de Koker, N1  Elvin, A A2  | |
[1] Stellenbosch University;University of the Witwatersrand | |
关键词: structural reliability; risk optimisation; reliability index; structural member design.; | |
DOI : 10.17159/2309-8775/2018/v60n4a2 | |
学科分类:建筑学 | |
来源: South African Institution of Civil Engineering / Suid-Afrikaanse Instituut van Siviele Ingenieurswese | |
【 摘 要 】
The balance between safety and economy in structural design was explored in the context of the member cost, liability and location in a structure. A model was developed giving the optimal reliability of a member, taking account of the tradeoff between cost and risk in maximising the long-term expected benefit derived from the structure. The model was first applied to a single independent member to derive a relationship which expresses the reliability required for optimal benefit as a function of the liability-cost ratio. Next the model was applied to two test structures: a determinate steel truss and a multi-storey reinforced concrete frame. Reliability analysis for both structures revealed that members can be treated as independent, and that marginal benefit is greatest for members with the highest liability-cost ratio values. It was shown that the relationship of liability-cost ratio versus optimal reliability provides a guideline for the improvement of existing structural design. Structures with reliabilities less than the optimal value can most effectively be improved by strengthening members with the highest liability-cost ratio values, while structures with reliabilities greater than optimal are improved by economising on members with the lowest liability-cost ratio values.
【 授权许可】
CC BY
【 预 览 】
Files | Size | Format | View |
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RO201910257222496ZK.pdf | 454KB | download |