Abstract
The growing number of vehicle fire incidents on suspension bridges poses a significant threat to the safety of the cable body components of these structures. This study focuses on the Longtan Bridge and employs a coupled Computational Fluid Dynamics-Finite Element Method (CFD-FEM) approach to recreate the environment of a tanker truck fire. A three-dimensional heat transfer model of the cable components and a structural fire resistance analysis model of the entire bridge are established. The study reveals the heat transfer patterns of cable components under a tanker truck fire and the evolution of the bridge structure's performance. Additionally, fire protection measures for cable components are proposed. The results indicate that during a tanker truck fire, the bridge deck exhibits a spatial transient temperature field, with temperatures around the cable components reaching 1170 °C, causing the highest temperature experienced by the steel wires on the cable surface to reach 736 °C. Under fire conditions, there is a redistribution of internal forces between the cables, with the fire-affected cable experiencing a decrease in internal forces and significant increases in adjacent cables' internal forces. The fire leads to plastic deformation in the fire-affected cable, resulting in permanent damage to the cables. When the number of cables broken due to fire at the midspan of the Longtan Bridge reaches six, the stress in the adjacent cables reaches 1861 MPa, exceeding the cables' ultimate tensile strength, leading to a progressive collapse of the entire bridge structure. The proposed heat-expansion fireproof coating and combination fire protection measures meet the regulatory requirements for fire resistance. It is recommended to apply a 3.5 mm thick heat-expansion fireproof coating on the main cable and cable components of the Longtan Bridge for fire protection. The research findings can serve as a reliable basis for establishing a fire protection system for the cable components of the Longtan Bridge.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
