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Effect of the Traffic Load Distribution on the Progressive Collapse of a Cable-Stayed Bridge Under Blast Load

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International Journal of Steel Structures Aims and scope Submit manuscript

Abstract

The advanced coupled finite element models can be used to model the structures and the extreme load of air blast as well as the interaction between them. However, the structural response of long-span bridges can be significantly influenced by the magnitude and location of blast load and pattern and magnitude of traffic load along and across the deck. In addition, the previous studies considered the cable loss when the bridge is intact, however the damage of explosion on a bridge causes new deformation and characteristics. Accordingly, in this study, the effect of five different traffic loading cases has been investigated on the maximum response of a cable-stayed bridge under eight different blast scenarios and the possibility of progressive collapse has been evaluated. It is concluded that the traffic load configurations on the bridge can vary maximum actions on different components up to 30%. Cable loss or anchorage zone destruction under blast loading scenarios are observed independent of the traffic load distribution. Meanwhile, the progressive collapse of bridge due to cable loss likely occurs in a number of the blast scenarios. Moreover, the vulnerability of more than one cable loss is clearly observed in some cases and designing bridges based on only one cable loss is not safe if the occurrence of hazards on the bridge is unavoidable. Besides, two symmetric traffic loading scenarios (i.e. 50% of traffic load applied on the entire bridge, and 50% of the traffic load only applied on middle span) are identified as the most critical in terms of the bridge components response.

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Commercial software LS-DYNA is used to produces the results.

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Acknowledgements

The authors acknowledge with thanks the support of the IT staff at the Leonardi Engineering Research Cluster at UNSW Australia, which provided high-powered computational resources for the LS-DYNA runs in the paper.

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No funding was received to assist with the preparation of this manuscript.

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Authors and Affiliations

  1. School of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

    S. K. Hashemi

  2. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia

    H. R. Valipour & M. A. Bradford

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  1. S. K. Hashemi
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  2. H. R. Valipour
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  3. M. A. Bradford
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by SKH and HRV. The first draft of the manuscript was written by SKH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to S. K. Hashemi.

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Hashemi, S.K., Valipour, H.R. & Bradford, M.A. Effect of the Traffic Load Distribution on the Progressive Collapse of a Cable-Stayed Bridge Under Blast Load. Int J Steel Struct 21, 1937–1952 (2021). https://doi.org/10.1007/s13296-021-00544-4

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  • DOI: https://doi.org/10.1007/s13296-021-00544-4

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