新型过渡段护栏的力学机理与数值模拟

为研究车辆高速碰撞高速公路上过渡段半刚性护栏的安全问题,提高吸收汽车碰撞动能和增强过渡段护栏的刚性防护能力,通过对大量碰撞事故实地考查,分析了中国现有过渡段半刚性护栏设计的缺陷,设计出了一种具有较高的刚性,可用以抵御重型车辆碰撞时产生的巨大能量,并能起到很好卸能效果的新型过渡段护栏;并利用LS-DYNA有限元软件对汽车高速碰撞新型过渡段护栏进行仿真模拟。结果表明：新型过渡段护栏尺寸设计合理,起到了刚度过滤的效果,能够有效地提高汽车和乘员的安全系数。

Mechanical Mechanism and Numerical Simulation of New Guard Rail of Transition Section

In order to study the safety of semi-rigid guard rail of transition section collided by vehicle at high speed on expressway and to enhance absorbing auto kinetic energy and rigid protection capability of guard rail of transition section,through a large number of investigations on the basis of collision accident,the flaw of current guard rail of transition section in China was analyzed.A new type of guard rail of transition section which had enough rigidity to resist the enormous energy produced by the collision between heavy vehicle and guard rail of transition section was designed.It played a better unloading result.Finite element software LS-DYNA was used to do numerical simulation about collision between vehicle and guard rail of transition section by high speed.Results show that the new type of guard rail of transition section can effectively increase safety factor of automobile and crew.Its design dimension is reasonable and realizes the effect of rigidity transition.