To solve the problem of seriously element wrap during the finite element analysis process of bus rollover collision, the wrap modification improvement of a new type of four-node DKT (Discreted Kirchhoff Theory) thin-shell element is carried out. The new type of improved four-node DKT thin-shell element is applied to the one-step algorithm for bus rollover collision, and the rollover collision simulation is carried out for the typical bus body section of a 12-m bus body structure. The simulation result is compared with the original one-step algorithm for bus rollover collision. The result shows that the simulation efficiency of the improved one-step algorithm for bus rollover collision is about 50% higher than that of the original algorithm, and the computational precision is increased by about 3.2%. The effectiveness of actual engineering application of the new type of improved element is verified in the end.

为了解决公交车侧翻碰撞有限元分析过程中严重缠绕问题，对新型四节点DKT（离散基尔霍夫理论）薄壳单元的缠绕改进进行了改进。将新型改进的四节点DKT薄壳单元应用于公交车侧翻碰撞的单步算法，并针对12米公交车主体结构的典型公交车主体截面进行了翻滚碰撞仿真。仿真结果与原始的一步法公交车侧翻碰撞进行了比较。结果表明，改进的单步算法对公交车侧翻碰撞的仿真效率比原始算法提高了约50％，计算精度提高了约3.2％。