冲击荷载下高速公路护栏的实验研究和优化分析(英文)

Experimental Investigation and Optimized Analyses of Highway Guardrails Under Impact Loads

通过对冲击作用下的高速公路护栏进行实验研究和有限元分析,探讨了高速公路护栏的动力特征.发现随着冲击位移的增加,冲击速度几乎呈线性下降,冲击加速度很快减少到一个极小值,而能量吸收阶段中前阶段的吸收速度比后阶段快.文中还根据护栏的能量吸收特征和初始冲击力对护栏结构进行了优化设计.结果表明,在所选的各种高速公路缩比护栏模型中,1.3mm厚、0.665m单跨长的三波形梁是最优波形护栏结构.

The dynamic characteristics of highway guardrails under impact loads are investigated by experiments and finite-element analyses. The results indicate that, with the increase of the impact displacement, the impact velocity decreases almost linearly, and the impact acceleration quickly declines to a minimum. Moreover, the energy-absorbing process is divided into two phases, and energy is absorbed much faster in the first phase. An optimized design of the gnardrails is also carried out by considering the energy-absorbing feature and the initial impact force, concluding that the Thrie beam with the thickness of 1.3 mm and the span of O. 665 m is the optimal structure of all selected guardrails.