Abstract: Because of pavement overlaying, the guardrail height lowered, which influenced the safety performance of guardrail significantly. LS-DYNA, a kind of finite element (FE) analysis software, was used to carry out the simulated collision test with different heights of waved guardrails. The relationship between guardrail height lowering and security capabilities was analyzed quantitatively. The height threshold value of guardrail crash performance which met the requirement of specifications was determined. Reforming project on the original guardrail of highway along the sea was proposed, and the reforming project was proved to meet the requirement of specifications by computer simulation.

Key words: traffic engineering, height of guardrail, collision, simulation model, safety performance

摘要： 护栏高度由于路面加铺罩面而降低，使得其安全防护性能受到影响。利用LS-DYNA有限元分析软件对不同高度下波形梁护栏进行了碰撞仿真实验，量化分析了护栏高度降低与其安全防 护能力关系，确定了护栏防撞性能不能满足规范要求的临界高度值。对沿海高速公路原有护栏提出改造方案，并运用计算机仿真证明其符合规范规定。

关键词: 交通工程, 护栏高度, 碰撞, 仿真模型, 安全性能