预应力UHPC-NC组合梁截面优化设计

Section optimization design of prestressed UHPC-NC composite beams

针对预应力超高性能混凝土-普通混凝土(UHPC-NC)组合梁结构的优化设计,提出了基于改进的自适应遗传算法的结构优化设计方法。优化设计以材料成本最小化为优化目标,以组合梁截面参数作为优化设计变量,并结合承载力及变形等约束条件,建立预应力UHPC-NC组合梁的数学模型。通过优化算例表明,改进的自适应遗传算法具有较好的极值寻优能力和收敛性能。利用自适应遗传算法搜索求解预应力UHPC-NC组合梁最优设计参数,优化结果表明:优化后得到的组合梁截面参数取值合理,满足约束条件要求。

A structural optimization design method based on improved adaptive genetic algorithm was proposed for the optimal design of prestressed ultrahigh performance concrete-ordinary concrete(UHPCNC)composite beams.In order to minimize the cost of prestressed UHPC-NC composite beams,a mathematical model of prestressed UHPC-NC composite beams was established by taking the sectional parameters of the composite beams as the optimization variables and combining the constraints of bearing capacity and deformation.The optimization example shows that the improved adaptive genetic algorithm has better optimization ability and convergence performance.The optimal design parameters of prestressed UHPC-NC composite beams were searched by using adaptive genetic algorithm.The optimization results show that the optimized section parameters of prestressed UHPC-NC composite beams are reasonable and meet the requirements of constraint conditions.