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The effect of inclination angle on fire behaviors of stay cable in an intercepted double-layer cable model

  • Changkun ChenEmail author
  • Jie Chen
  • Xiaolong Zhao
  • Congling Shi
Article
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Abstract

Understanding the fire characteristics of stayed-cable bridge, such as fire growth, during accidental fire is essential to develop prevention strategies for potential damage. This study focuses on the effects of high cable fire that may result from a short circuit or a lightning strike since high flammability heat release characteristics of HDPE sheath causes burning of nearby cables. Fire propagation behaviors on one single cable and between two adjacent cables under working conditions with different inclination angles were obtained. The temperature distribution, drop ignition behaviors and flame spread rate were analyzed. The results show that flame propagation characteristics of stay cables seriously changed as the angle of inclination increases, which explain the fracture sequence of cables to some extent for the Red Stone Bridge fire event. The particle size of molten substance formed by combustion of the upper-layer cables increases, and the ignition position for the under-layer cable gradually moves down as the increase of inclination angle. Moreover, increased inclination angle also resulted in increase in flame height and molten drops flow rate and reduce in the duration of the prosperity stage for cable fire. Although HDPE sheath is a protective device, it does prevent the combustion for inner strands from becoming intense, but once ignited, would become the main fire load, promoting fire development.

Keywords

Cable-stayed bridge Molten drop Inclination angle Cable fire Fire characteristic 

Notes

Acknowledgements

This work was supported by National Natural Science Foundation of China (NSFC) under Grants 51576212 and 71790613. The authors appreciate the supports deeply.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Institute of Disaster Prevention Science and Safety TechnologyCentral South UniversityChangshaPeople’s Republic of China
  2. 2.Beijing Key Laboratory of Metro Fire and Passenger Transportation SafetyChina Academy of Safety Science and TechnologyBeijingPeople’s Republic of China

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