Multi-objective Optimization Method of Temporary Pier Layout and Guide Beam Parameters for Incremental Launching Construction of Long-span Bridges: The Main Bridge of Haihe River Crossing on the West Central Ring Expressway in Binhai New Area, Tianjin
1 China Railway 18th Bureau Group 5th Engineering Co., Ltd., Tianjin 300450, China
2 School of Civil Engineering, Tianjin University, Tianjin 300072, China
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2025-05-21
2026-03-28
2025-11-10
Online Date
2026-06-02
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摘要
为获取大跨度桥梁顶推施工临时墩间距、导梁长度及刚度的最优参数,优化主梁内力线形,节约材料成本,提出一种基于非支配排序遗传算法Ⅱ(non-dominated sorting genetic algorithm Ⅱ,NSGA-Ⅱ)遗传算法的主梁线形及材料成本优化方法。以临时墩最大支反力与主梁截面最大应力为约束条件,建立临时墩间距、导梁长度及刚度与顶推就位主梁线形及材料成本的多目标优化模型。该方法通过NSGA-Ⅱ遗传算法迭代求解ANSYS顶推施工全过程杆系模型,进行联合仿真优化。通过快速非支配排序与精英保留策略得到Pareto前沿优化解集,最后通过逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)选出最佳方案。通过具体工程分析,得到的Pareto优化解集收敛性好,可根据不同目标侧重从中选取设计参数,最终推荐临时墩间距59 m,导梁长度35 m,导梁刚度为主梁的0.15倍。研究结果可为相关工程施工方案设计提供参考。
Abstract
In order to obtain the optimal parameters of temporary pier spacing, guide beam length and stiffness in launching construction of long-span bridges, optimize the internal force alignment of main girder and save material cost, an optimization method of main girder alignment and material cost based on non-dominated sorting genetic algorithm Ⅱ(NSGA-Ⅱ) genetic algorithm was proposed. Taking the maximum reaction force of the temporary pier and the maximum stress of the main beam section as the constraint conditions, a multi-objective optimization model of the temporary pier spacing, the length and stiffness of the guide beam and the alignment and material cost of the jacking in place main beam was established. The NSGA-Ⅱ genetic algorithm was used to iteratively solve the bar system model of the whole process of ANSYS launching construction, and the joint simulation optimization was carried out. The Pareto front optimization solution set was obtained by fast non-dominated sorting and elite retention strategy. Finally, the best solution was selected by technique for order preference by similarity to an ideal solution(TOPSIS). Through specific engineering analysis, the Pareto optimal solution set obtained has good convergence, and the design parameters can be selected according to different objectives. Finally, it is recommended that the temporary pier spacing is 59 m, the length of the guide beam is 35 m, and the stiffness of the guide beam is 0.15 times that of the main beam, which can provide reference for the design of related engineering construction schemes.
HOU Xu-feng, YANG Wei-han, ZHU Jin-song, TAO You-hai, ZHANG Bi-meng, SHANG Li.
Multi-objective Optimization Method of Temporary Pier Layout and Guide Beam Parameters for Incremental Launching Construction of Long-span Bridges: The Main Bridge of Haihe River Crossing on the West Central Ring Expressway in Binhai New Area, Tianjin[J].
Science Technology and Engineering, 2026, 26(9): 3978-3985 DOI:10.12404/j.issn.1671-1815.2503802
现有临时墩间距及导梁参数优化通常采用结构力学解析法求解,然后利用有限元模型进行验证。采用多目标优化算法进行的研究没有考虑导梁刚度参数的优化设计,优化过程中没有对主梁应力和临时墩支反力进行约束,优化解集中存在应力超限的优化方案。针对目前研究的不足,现提出一种基于非支配排序遗传算法Ⅱ(non-dominated sorting genetic algorithm Ⅱ,NSGA-Ⅱ)遗传算法的临时墩间距及导梁参数优化方法。首先,以临时墩间距、导梁长及刚度为优化变量,以顶推施工过程主梁应力与临时墩支反力为约束条件,建立关于材料成本与顶推就位线形的多目标优化模型;其次,建立顶推施工全过程有限元杆系模型,求解结构响应;最后,通过NSGA-Ⅱ算法进行迭代寻优得到优化解集,利用逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)决策得到最佳优化方案。以期为相关工程施工方案设计提供参考。
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