基于防撞性能的公路混凝土护栏设计与优化分析

Design and optimization analysis of highway concrete guardrail based on crash resistance

以下穿桥梁的高速公路翼墙防护工程为依托,研究了公路混凝土护栏的构造设计流程和防撞性能,建立了翼墙数值三维有限元模型,完成了公路混凝土护栏在相关规范规定下的静力力学行为和承载力及参数优化分析,提出了适合本依托工程的设计参数取值以及优化措施建议,降低了运营过程中其路侧桥墩被碰撞以及人员伤亡的风险。研究结果表明,混凝土护栏内埋钢管参数、混凝土材料及构造尺寸和汽车碰撞位置等易对护栏结构安全造成不同程度的影响,其中钢管桩间距和翼墙露出地面高度对整体防撞性能影响较大,依托工程在兼顾护栏耗能性能因素影响的同时,内埋钢管间距取1 m、直径取140 mm、埋设深度取0.7 m、混凝土露出高度取1 m时,防撞性能表现良好。

Based on the wing wall protection project of a highway that underpasses a bridge,the structural design process and anti-collision performance of the highway concrete guardrail are studied and discussed.The numerical three-dimensional finite element model of the wing wall is established,and the static mechanical behavior,bearing capacity and parameter optimization analysis of the highway concrete guardrail under the relevant regulations are completed.The value of design parameters and suggestions of optimization measures are put forward to reduce the risk of collision and casualties of roadside piers during operation.The research results show that the parameters of embedded steel pipe,concrete material and structural size,and the position of car collision of the concrete guardrail are easy to cause different degrees of impact on the safety of the guardrail structure.Among them,the distance between steel pipe piles and the height of the outlying ground of the wing wall have a great impact on the overall anti-collision performance.When the spacing of the embedded steel pipe is 1 m,the diameter is 140 mm,the buried depth is 0.7 m and the exposed height of the concrete is 1 m,the anti-collision performance is good.