高速列车运行中火灾状态结构安全分析

为了分析高速列车火灾时在紧急制动以后运行的安全性，选取列车在隧道内运行的场景，通过FDS软件模拟得到火灾后车体内温度场，基于一维热传导理论得到车体结构的温度场分布，在车体结构材料本构中考虑高温对强度及刚度的弱化影响，通过ABAQUS计算列车在最大压缩载荷和拉伸载荷作用下的应力分布和垂向位移。通过分析得到车体大面积温度在500℃左右；最大压缩载荷下车体底架前部构件出现断裂失效，底架中间出现裂纹，中间的垂向位移在42～80 mm之间，最大拉伸载荷下车体损伤略小，车体未出现断裂，底架前部和中间的垂向位移在40～50 mm范围内；底架中间高温是导致断裂失效的最主要原因，在隔热设计中需要对此重点考虑。

Structural safety analysis on running high speed train in fire

In order to analyze the safety of high-speed train in fire after emergency braking, the scenario of train running in tunnel was selected. The temperature field in train after fire was simulated by using the FDS software, and the temperature field distribution of train body was obtained based on the one-dimensional heat conduction theory. The stress distribution and vertical displacement of train under the effect of the maximum compressive load and tensile load were calculated through ABAQUS by considering the weakening impact of high temperature on the strength and stiffness of train body structure material. The results showed that the temperature of the large area on train body is about 500℃. Under the maximum compression load, the fracture failure occurs in the front of train underframe, the cracks occur in the middle of underframe, and the vertical displacement of the middle was between 42mm and 80mm. Under the maximum tensile load, the damage of train body is slightly smaller, there are no cracks on the train body, and the vertical displacement of the front and the middle of underframe is in the range of 40mm to 50mm. The fracture failure is mainly due to the high temperature in the middle of underframe, so it should be paid more attention in the insulation design.