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基于钢管压扁吸能机理,通过在组合式护栏的横梁上设置钢管吸能构件,设计出一种适用于雅泸高速公路连续长大下坡路段的减速护栏。根据计算机仿真分析结果可知,车辆贴靠碰撞减速护栏时钢管压扁变形,使车辆的动能转化为吸能钢管的内能,可有效降低车速。设置吸能钢管可减小组合式护栏的最大动态变形量和横梁变形范围,对组合式护栏的碰撞后维护是有利的,吸能钢管在车辆碰撞护栏过程中的性能表现可满足设计要求。
Based on the mechanism of flattening and absorbing of steel tube, a decelerating guardrail suitable for continuous long downhill section of Ya-Lu Expressway was designed by arranging steel-pipe energy-absorbing components on the beam of modular guardrail. According to the results of computer simulation, it can be seen that the steel tube is crushed and deformed when the vehicle is in contact with the deceleration derailleur so that the kinetic energy of the vehicle can be transformed into the internal energy of the energy-absorbing steel tube, which can effectively reduce the vehicle speed. The energy-absorbing steel pipe can reduce the maximum dynamic deformation and the deformation range of the composite guardrail, which is beneficial to the post-collision maintenance of the composite guardrail. The performance of the energy-absorbing steel pipe in the collision of the guardrail of the vehicle can meet the design requirements.