Abstract
This paper presents a numerical study on the high‐temperature mechanical properties of a long‐span double‐deck suspension bridge. The main focus of this paper is the behavior analysis of Wuhan Yangtze River Bridge. A three‐dimensional thermal model of the bridge was established by the Fire Dynamics software (FDS) to obtain the 3D temperature field distribution, and the thermal analysis result was then applied to the three‐dimensional finite element model of the suspension bridge. The shortest failure time of the main cable and sling was determined to obtain the rescue time of a bridge fire. According to the calculation results of the suspension bridge under a tanker fire initiated at the upper deck of the bridge, the middle lane in the upper deck of the suspension bridge was determined to be a safe lane. Thus, the tanker should be guided to go in this lane of the bridge. The numerical analysis of the experimental results shows that when the fuel tanker is located on the upper and lower floors of the bridge, the bridge structure is affected by the fire. When the oil tanker burns in the outermost lane of the upper bridge, it will have a great impact on the main cables and slings of the bridge. When the fuel tanker burns in the lower nonmotorized lane of the bridge, it will have a great impact on the upper stiffening beam steel plates and truss rods.
Highlights
When the suspension bridge structure is damaged during a tanker fire, it could result in a considerable loss of human life and economic properties
Once a tanker fire happens on a bridge, a high-temperature field will occur and the temperature of the main cable, suspender cable, deck pavement, and stiffening beam of the suspension bridge will increase rapidly
Solid elements were used in key parts of the model, and truss units were used in other parts. is simulation method can accurately calculate the temperature field distribution of the key parts of the suspension bridge according to the number of model units and connect the main components to the whole bridge
Summary
When the suspension bridge structure is damaged during a tanker fire, it could result in a considerable loss of human life and economic properties. In 2015, Peris-Sayol [6] used Fire Dynamics software (FDS) to study the mechanical effects of the steel bridge under fire from the geometric parameters of the bridge, the modeling method, the location of the fire, and the surrounding environment; the most dangerous fire scenario of the bridge was obtained He pointed out that the finite element software can calculate and predict the destruction time of a bridge. Is simulation method can accurately calculate the temperature field distribution of the key parts of the suspension bridge according to the number of model units and connect the main components to the whole bridge. E elastic modulus and strength of the steel, combined with the dead load and live load of the bridge, and the high-temperature mechanical properties of the suspension bridge over time can be analyzed. In the finite element model of mechanics, the elastic modulus and strength of the changed steel can be defined by the temperature load, and the temperature in the tank-truck fire is a function of time, so the finite element model of the mechanics can be calculated by the indirect coupling method to obtain the change with time. e elastic modulus and strength of the steel, combined with the dead load and live load of the bridge, and the high-temperature mechanical properties of the suspension bridge over time can be analyzed. e mechanical properties of the bridge under high temperature are calculated according to the above calculation principle, and the damage time and best rescue time of the bridge fire are obtained, which provides the technical basis for fire-resistance design of the bridge
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