Uncertainties in crowd dynamic loading of footbridges: A novel multi-scale model of pedestrian traffic.
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| Title: | Uncertainties in crowd dynamic loading of footbridges: A novel multi-scale model of pedestrian traffic. |
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| Authors: | Bruno, Luca1 luca.bruno@polito.it, Corbetta, Alessandro2 |
| Source: | Engineering Structures. Sep2017, Vol. 147, p545-566. 22p. |
| Subjects: | Footbridges, Pedestrian traffic flow, Structural reliability, Mechanical loads, Strains & stresses (Mechanics) |
| Abstract: | The study of the probabilistic response of pedestrian-excited structures as well as their reliability analysis need to take into account the influence of a large number of uncertain parameters ascribed to structural characteristics, single pedestrian walking features and pedestrian traffic phenomena. Although pedestrian traffic is characterized by an intrinsic high variability and plays a key role in determining the pedestrian load, its probabilistic description remains scarce in literature. The present work aims at contributing to the probabilistic evaluation of the pedestrian traffic across footbridges. First, a categorized state of the art focused on sources of uncertainty is provided. Second, a new modeling framework for the probabilistic evaluation of pedestrian traffic is introduced in general and conceptual terms. The framework is conceived in analogy to the approach developed in another engineering field, i.e. wind engineering, on the basis of the phenomenological features of the pedestrian traffic. In order to put the framework in practice, each of its main modeling components is specified. We introduce a statistic approach to evaluate the incoming traffic and a microscopic traffic model to simulate the propagation along the footbridge of the uncertain pedestrian entrance. In order to prove its technical feasibility, the proposed framework is finally applied to an ensemble of real world crowd events and to two ideal footbridges with differently shaped walkway. As a final result, the pedestrian density along the footbridge is described as a random field in terms of its joint and unconditioned probability density functions and correlation lengths. [ABSTRACT FROM AUTHOR] |
| Copyright of Engineering Structures is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 124421431 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Uncertainties in crowd dynamic loading of footbridges: A novel multi-scale model of pedestrian traffic. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bruno%2C+Luca%22">Bruno, Luca</searchLink><relatesTo>1</relatesTo><i> luca.bruno@polito.it</i><br /><searchLink fieldCode="AR" term="%22Corbetta%2C+Alessandro%22">Corbetta, Alessandro</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Engineering+Structures%22">Engineering Structures</searchLink>. Sep2017, Vol. 147, p545-566. 22p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Footbridges%22">Footbridges</searchLink><br /><searchLink fieldCode="DE" term="%22Pedestrian+traffic+flow%22">Pedestrian traffic flow</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+reliability%22">Structural reliability</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The study of the probabilistic response of pedestrian-excited structures as well as their reliability analysis need to take into account the influence of a large number of uncertain parameters ascribed to structural characteristics, single pedestrian walking features and pedestrian traffic phenomena. Although pedestrian traffic is characterized by an intrinsic high variability and plays a key role in determining the pedestrian load, its probabilistic description remains scarce in literature. The present work aims at contributing to the probabilistic evaluation of the pedestrian traffic across footbridges. First, a categorized state of the art focused on sources of uncertainty is provided. Second, a new modeling framework for the probabilistic evaluation of pedestrian traffic is introduced in general and conceptual terms. The framework is conceived in analogy to the approach developed in another engineering field, i.e. wind engineering, on the basis of the phenomenological features of the pedestrian traffic. In order to put the framework in practice, each of its main modeling components is specified. We introduce a statistic approach to evaluate the incoming traffic and a microscopic traffic model to simulate the propagation along the footbridge of the uncertain pedestrian entrance. In order to prove its technical feasibility, the proposed framework is finally applied to an ensemble of real world crowd events and to two ideal footbridges with differently shaped walkway. As a final result, the pedestrian density along the footbridge is described as a random field in terms of its joint and unconditioned probability density functions and correlation lengths. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Engineering Structures is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.engstruct.2017.05.066 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 545 Subjects: – SubjectFull: Footbridges Type: general – SubjectFull: Pedestrian traffic flow Type: general – SubjectFull: Structural reliability Type: general – SubjectFull: Mechanical loads Type: general – SubjectFull: Strains & stresses (Mechanics) Type: general Titles: – TitleFull: Uncertainties in crowd dynamic loading of footbridges: A novel multi-scale model of pedestrian traffic. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bruno, Luca – PersonEntity: Name: NameFull: Corbetta, Alessandro IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 09 Text: Sep2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 01410296 Numbering: – Type: volume Value: 147 Titles: – TitleFull: Engineering Structures Type: main |
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