Target reliability for new road bridges in South Africa

IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL
A. Way, N. de Koker, C. Viljoen
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引用次数: 0

Abstract

Currently, there are no recommendations of target reliability for new-build road bridges tailored to developing countries. Target reliabilities in existing international literature reflect the economic and social circumstances associated with developed countries and may not be economically or societally acceptable for South Africa. This research determines target reliability for new-build road bridges specifically for a South African context. Economic cost optimisation and a societal risk approach are considered. Cost optimisation considers the cost of safety and consequences of failure. The life quality index methodology is used to consider limits on target reliability from a societal risk perspective. Additionally, the effect of structural redundancy on target reliability in bridges is investigated. Target reliabilities from cost optimisation are shown to be slightly higher than those from SANS 10160-1 and correspond with those from ISO 2394:2015. Recommendations of annual target reliability for new-build road bridges in South Africa are proposed - a typical value of β = 4.2 is recommended. Societal limits on target reliability correspond with target reliability from cost optimisation for bridges with minor consequences of failure and do not govern new-build bridges in South Africa. Target reliability reduces with increasing measures of bridge redundancy; a means by which to consider the effect of structural redundancy on target reliability is also proposed.
南非新建公路桥梁的目标可靠性
目前还没有针对发展中国家新建公路桥的目标可靠性的建议。现有国际文献中的目标可靠性反映了与发达国家有关的经济和社会情况,南非在经济或社会上可能无法接受。本研究确定了南非新建公路桥梁的目标可靠性。考虑了经济成本优化和社会风险方法。成本优化考虑了安全成本和故障后果。使用生活质量指数方法从社会风险角度考虑目标可靠性的限制。此外,还研究了结构冗余对桥梁目标可靠度的影响。成本优化的目标可靠性略高于SANS 10160-1,并与ISO 2394:2015一致。对南非新建公路桥梁的年度目标可靠度提出了建议,建议采用β = 4.2的典型值。在南非,社会对目标可靠性的限制与桥梁成本优化的目标可靠性相一致,这些桥梁的失败后果较小,并不适用于新建的桥梁。目标可靠性随着桥梁冗余措施的增加而降低;提出了一种考虑结构冗余对目标可靠性影响的方法。
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来源期刊
CiteScore
0.70
自引率
25.00%
发文量
19
审稿时长
>12 weeks
期刊介绍: The Journal of the South African Institution of Civil Engineering publishes peer reviewed papers on all aspects of Civil Engineering relevant to Africa. It is an open access, ISI accredited journal, providing authoritative information not only on current developments, but also – through its back issues – giving access to data on established practices and the construction of existing infrastructure. It is published quarterly and is controlled by a Journal Editorial Panel. The forerunner of the South African Institution of Civil Engineering was established in 1903 as a learned society aiming to develop technology and to share knowledge for the development of the day. The minutes of the proceedings of the then Cape Society of Civil Engineers mainly contained technical papers presented at the Society''s meetings. Since then, and throughout its long history, during which time it has undergone several name changes, the organisation has continued to publish technical papers in its monthly publication (magazine), until 1993 when it created a separate journal for the publication of technical papers.
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