Cost-optimization based target reliabilities for design of structures exposed to fire
Adequacy of structural fire design in uncommon structures is conceptually ensured through cost-benefit analysis where the future costs are balanced against the benefits of safety investment. Cost-benefit analyses, however, are complicated and computationally challenging, and hence impractical for ap...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-06-01
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| Series: | Resilient Cities and Structures |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772741624000073 |
| _version_ | 1797226604958580736 |
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| author | Ranjit Kumar Chaudhary Thomas Gernay Ruben Van Coile |
| author_facet | Ranjit Kumar Chaudhary Thomas Gernay Ruben Van Coile |
| author_sort | Ranjit Kumar Chaudhary |
| collection | DOAJ |
| description | Adequacy of structural fire design in uncommon structures is conceptually ensured through cost-benefit analysis where the future costs are balanced against the benefits of safety investment. Cost-benefit analyses, however, are complicated and computationally challenging, and hence impractical for application to individual projects. To address this issue, design guidance proposes target reliability indices for normal design conditions, but no target reliability indices are defined for structural fire design. We revisit the background of the cost-optimization based approach underlying normal design target reliability indices then we extend this approach for the case of fire design of structures. We also propose a modified objective function for cost-optimization which simplifies the evaluation of target reliability indices and reduces the number of assumptions. The optimum safety level is expressed as a function of a new dimensionless variable named “Damage-to-investment indicator” (DII). The cost optimization approach is validated for the target reliability indices for normal design condition. The method is then applied for evaluating DII and the associated optimum reliability indices for fire-exposed structures. Two case studies are presented: (i) a one-way loaded reinforced concrete slab and (ii) a steel column under axial loading. This study thus provides a framework for deriving optimum (target) reliability index for structural fire design which can support the development of rational provisions in codes and standards. |
| first_indexed | 2024-04-24T14:27:33Z |
| format | Article |
| id | doaj.art-1536ae3a13634da58cb4358e105fd20f |
| institution | Directory Open Access Journal |
| issn | 2772-7416 |
| language | English |
| last_indexed | 2024-04-24T14:27:33Z |
| publishDate | 2024-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Resilient Cities and Structures |
| spelling | doaj.art-1536ae3a13634da58cb4358e105fd20f2024-04-03T04:27:38ZengElsevierResilient Cities and Structures2772-74162024-06-01322033Cost-optimization based target reliabilities for design of structures exposed to fireRanjit Kumar Chaudhary0Thomas Gernay1Ruben Van Coile2Department of Structural Engineering and Building Materials, Ghent University, 9000 Ghent, Belgium; Corresponding author.Department of Civil Engineering, Johns Hopkins University, Baltimore, MD 21218, United StatesDepartment of Structural Engineering and Building Materials, Ghent University, 9000 Ghent, BelgiumAdequacy of structural fire design in uncommon structures is conceptually ensured through cost-benefit analysis where the future costs are balanced against the benefits of safety investment. Cost-benefit analyses, however, are complicated and computationally challenging, and hence impractical for application to individual projects. To address this issue, design guidance proposes target reliability indices for normal design conditions, but no target reliability indices are defined for structural fire design. We revisit the background of the cost-optimization based approach underlying normal design target reliability indices then we extend this approach for the case of fire design of structures. We also propose a modified objective function for cost-optimization which simplifies the evaluation of target reliability indices and reduces the number of assumptions. The optimum safety level is expressed as a function of a new dimensionless variable named “Damage-to-investment indicator” (DII). The cost optimization approach is validated for the target reliability indices for normal design condition. The method is then applied for evaluating DII and the associated optimum reliability indices for fire-exposed structures. Two case studies are presented: (i) a one-way loaded reinforced concrete slab and (ii) a steel column under axial loading. This study thus provides a framework for deriving optimum (target) reliability index for structural fire design which can support the development of rational provisions in codes and standards.http://www.sciencedirect.com/science/article/pii/S2772741624000073Target reliabilityCost optimizationLife-cycle costStructural fire engineeringDesign code |
| spellingShingle | Ranjit Kumar Chaudhary Thomas Gernay Ruben Van Coile Cost-optimization based target reliabilities for design of structures exposed to fire Resilient Cities and Structures Target reliability Cost optimization Life-cycle cost Structural fire engineering Design code |
| title | Cost-optimization based target reliabilities for design of structures exposed to fire |
| title_full | Cost-optimization based target reliabilities for design of structures exposed to fire |
| title_fullStr | Cost-optimization based target reliabilities for design of structures exposed to fire |
| title_full_unstemmed | Cost-optimization based target reliabilities for design of structures exposed to fire |
| title_short | Cost-optimization based target reliabilities for design of structures exposed to fire |
| title_sort | cost optimization based target reliabilities for design of structures exposed to fire |
| topic | Target reliability Cost optimization Life-cycle cost Structural fire engineering Design code |
| url | http://www.sciencedirect.com/science/article/pii/S2772741624000073 |
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