面向货车编队的水泥混凝土路面结构拓扑优化设计及验证

Topology Optimization Design and Validation of Cement Concrete Pavement Structure for Truck Platooning

摘要:

货车编队的渠化交通荷载对路面结构提出了高承载力及精细化设计需求。结合拓扑优化理论，基于变密度法、拓扑梯度法与移动渐近线法，提出了面向水泥混凝土路面的结构拓扑优化算法；分析货车编队轮迹偏移特征，利用数值计算设计了面向货车编队的水泥混凝土路面拓扑优化原型结构；从力学性能角度通过室内缩尺试验探究了拓扑优化原型结构的合理性。结果表明，对于轮迹零偏移和15 cm偏移范围的两种荷载分布，拓扑优化原型结构最大疲劳应力分别为传统结构的45.0%和37.5%，同时其质量分别为传统结构的34.3%和30.5%；试验测得的拓扑优化原型结构的最大疲劳应力与理论计算值相近，且相较于传统结构，其极限承载力提升了18.3%，证明了设计方法的有效性。

Abstract:

Truck platooning has proposed high bearing capacity and fine design requirement for pavement structure. In combination with the topology optimization theory， this paper proposes a topology optimization method of cement concrete pavement structure based on the solid isotropic microstructure with penalization （SIMP） method， the topology gradient method， and the method of moving asymptotes （MMA）. A prototype structure of cement concrete pavement is designed based on the numerical calculation， considering the analyzed wheel track characteristic of truck platooning. Finally， the scale experiment is employed to verify the mechanical property of the prototype structure. The results show that the maximum fatigue stress of the prototype is reduced to 45.0% and 37.5% of the traditional concrete pavement structure at a channelized traffic load and the traffic load with an offset of 15 cm respectively， and the weight is reduced to 34.3% and 30.5% of the traditional structure. The bearing capacity of the prototype structure measured by the experiment is 18.3% higher than the traditional structure， which proves the effectiveness of the design method.