混凝土护栏在超高速磁悬浮列车碰撞下的有限元分析

Finite element modeling of concrete guardrail's responses under impact of ultrahigh speed maglev train

针对目前磁悬浮列车工程中,对护栏结构的研究稀缺,结合日本"东京——名古屋"段中央新干线磁悬浮列车的实际工程,针对磁悬浮列车护拦的防护作用,开展基于ANSYS/LSDYNA显示动力算法的仿真分析。模拟高速弯道过车时磁悬浮列车脱轨撞击护拦的过程。根据不同角度下列车撞击后护栏的变形结果,对护拦抵抗冲撞的能力进行对比分析。研究结果表明:在保证超高速运行的极限转弯半径下,磁悬浮列车脱轨撞击混凝土护栏,沿护拦擦撞形成沟壑状大面积损伤,但护拦未见穿透现象,仍能起到防护作用,阻止列车完全冲出轨道。对比相同速度下不同角度列车的撞击,极限转弯半径时,列车与护拦碰撞时的接触角度最大,此时护栏破损最为严重。

In the current maglev train project,the research on the guardrail structure is scarce,and the actual vehicle experiment is almost zero.Based on the engineering project of the Central Shinkansen maglev train in the“Tokyo-Nagoya”of Japan,this paper conducted the finite element analysis with ANSYS/LSDYNA explicit dynamic algorithm.The final deformation was obtained after simulation of the impact of the maglev train during turning in different angles.Comparing the protection ability of the guardrail in impacts,it shows that after the maglev train derails and collides with concrete guardrails at minimum turning radius,the guardrail forms large area damage,but penetration is not observed.The guardrail can prevent the train from completely out of the tracks.In comparison with situations at different angles in the same speed,when the train strikes the guardrail at the largest angle,the damage of guardrail is the most serious.