洞庭湖二桥护栏立柱的耐撞性拓扑优化和尺寸优化

Crashworthiness topology optimization and size optimization on guardrail column of Second Dongting Lake Bridge

为设计出防撞等级达到HA级(760kJ)的临湘至岳阳高速(简称"大岳高速")洞庭湖二桥桥梁钢护栏,文章基于耐撞性拓扑优化方法,对桥梁钢护栏立柱进行了拓扑优化分析,获取了矩形截面形式的桥梁钢护栏立柱拓扑构型,基于现行评价标准与正交试验设计方法,对矩形截面桥梁钢护栏立柱进行了优化设计,确定了厚度的最优参数组合;对最优参数组合的护栏立柱进行质量计算并运用4种车型进行验证分析,结果表明,碰撞仿真计算所得车辆运行轨迹、车体加速度等护栏安全评价指标满足安全性能评价标准要求。

In order to design the steel bridge guardrail of the Second Dongting Lake Bridge on Dayue Expressway whose crash rating meets the requirement of HA（760 kJ）, the rectangular cross-section topologies of guardrail column are obtained based on the erashworthiness topology optimization method. The steel rectangular cross-section bridge guardrail column is optimized according to the orthogonal experimental design and Standard for Safety Performance Evaluation of Highway Barriers（JTG t305-01-2013）, then the most optimal parameter combination is determined. Finally, the mass of the optimal guardrail column is calculated, and the optimal guardrail column is verified and analyzed by using four kinds of vehicle models. The result shows that the guardrail safety evaluation indexes of vehicle trace and acceleration obtained by simulation calculation meet the standard of safety performance evaluation.