岳阳洞庭湖二桥钢护栏优化设计

The optimization design of the steel guardrail of Yueyang Dongting Lake Bridge

为获得满足碰撞等级为HA级的桥梁钢护栏,对立柱初始构型进行了尺寸优化设计。首先,根据最新护栏安全性能评价标准,建立1.5t小车、25t客车、40t货车以及55t鞍车与护栏碰撞有限元模型;然后,参考护栏评价标准确定正交试验评价指标,并对护栏立柱各参数进行了单因素试验分析,确定截面各因素优化设计试验范围和水平数;再选用L16(45)正交实验表安排仿真试验,分别对仿真数据结果进行极差分析和方差分析,获得了最优立柱截面尺寸;最后,用4种车型对优化后护栏结构进行了仿真验证。研究结果表明,优化后护栏结构的防撞等级达到HA级,安全性能满足评价标准的要求。

In order to make bridge steel guardrail satisfy the collision level of HA, the size optimization design for the initial configuration of the column was designed. First according to the latest guardrail safety performance evaluation standard, the 1.5 t car, 25 t passenger car, 40 t truck and 55t saddle car were established with the barrier collision finite element model. Furthermore, orthogonal experiment evaluation index was ensured by referring guardrail evaluation standard. The parameters of barrier pillar are analyzed by single factor experiment,the paper ensured the optimization test scope of various factors and the number of levels, applied L16 （4^5） orthogonal test table to arrange simulation test. Then the poor a- nalysis and variance analysis of the result of the simulation data so as to obtain the optimal column section size. Last four kinds of models were simulated for optimized guardrail struc- ture. The results showed that the optimized guardrail structure could achieve test level of HA, which could meet the safety performance evaluation standard.