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为研究符合我国公路环境条件的交叉缠绕式柔性护栏端部锚固系统,结合我国公路环境并参考国外护栏端部锚固的设计,对锚固系统各部分外形及尺寸进行初步设计。运用ls-dyna软件建立锚固系统有限元碰撞分析模型,并结合实车试验方法与有限元仿真试验方法,得到锚固系统的外载荷及可靠的钢丝绳有限元模型。利用正交试验方法,对初始的锚固系统尺寸进行优化设计,通过极差和方差分析得到锚固系统的最优尺寸组合,对最优结果进行验证分析。结果表明,该锚固系统在受载情况下无任何拔出与倾斜,其土壤最大应力为8.2×10~(-3)M Pa,远小于其许用应力1.7×10~(-1)M Pa,能很好地满足各项评价指标。
In order to study the cross-wound flexible guardrail end anchoring system which conforms to the highway environmental conditions in our country, the design of each part of the anchoring system was first designed according to the highway environment in our country and the design of the anchorage at the end of guardrail. The ls-dyna software is used to establish the finite element analysis model of anchorage system. Combined with the actual vehicle test method and finite element simulation test method, the external load of the anchoring system and the reliable finite element model of the steel wire rope are obtained. The orthogonal test method is used to optimize the size of the initial anchoring system. The optimal size combination of the anchoring system is obtained through range and variance analysis, and the optimal result is verified and analyzed. The results show that the anchorage system has no pull - out and slope under loading conditions. The maximum soil stress is 8.2 × 10 ~ (-3) M Pa, much less than the allowable stress 1.7 × 10 ~ (-1) M Pa , Can well meet the various evaluation indicators.