文章摘要
张鸣祥,张睿,钟其仁.基于一阶优化法的连续梁桥整体顶升顶升力优化[J].安徽建筑大学学报,2023,31():
基于一阶优化法的连续梁桥整体顶升顶升力优化
Optimization of the overall lifting lifting force of continuous girder bridge based on first-order optimization method
投稿时间:2022-11-08  修订日期:2022-12-07
DOI:
中文关键词: 桥梁顶升施工  连续梁桥  目标函数  一阶优化法  顶升力
英文关键词: bridge jacking construction  continuous girder bridge  objective function  first-order optimization method  jacking force
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
张鸣祥 合肥工业大学 230000
张睿* 合肥工业大学 230000
钟其仁 合肥工业大学 
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中文摘要:
      为解决桥梁顶升施工过程中千斤顶的作用位置受工程实际情况的约束,仅能在有限区域布置的情况下如何确定千斤顶的顶升力这一问题,提出了一种基于一阶优化法的合理顶升力计算方法。该方法将复杂的力学问题转化为目标函数的求解问题,即通过建立有限元模型获得梁桥上部结构的内力值和应力值,再通过MATLAB程序进行优化分析。为验证该方法的有效性,以单箱单室预应力混凝土连续梁桥与单箱双室预应力混凝土连续梁桥为背景采用该方法计算千斤顶合理顶升力。基于连续梁桥受力特点,以顶升状态下的梁体弯矩和成桥状态的梁体弯矩近似相同为目标,以千斤顶顶升力和千斤顶布置位置为优化变量,以规范对短暂状况构件的应力规定为约束条件,建立了目标函数进行顶升力优化。结果表明:该优化方法能解决千斤顶刚性约束方式无法解决的支座出现负反力的问题;千斤顶的作用位置可作为自变量参与优化。
英文摘要:
      In order to solve the problem that the position of the jack in the process of bridge jacking construction is constrained by the actual situation of the project, and how to determine the jacking force of the jack when only the limited area is arranged, a reasonable jacking force calculation method based on the first-order optimization method is proposed. The method transforms the complex mechanical problem into solving the objective function problem, obtaining the internal force and stress of the beam bridge superstructure based on finite element modeling, and then carrying on optimization analysis through MATLAB program. In order to verify the effectiveness of this method, the reasonable jacking force of jack is calculated against the background of single-box single-chamber prestressed concrete continuous girder bridge and single-box double-chamber prestressed concrete continuous girder bridge. Based on the force characteristics of continuous girder bridges, the objective function is established to optimize the jacking force by taking the bending moment of the beam body in the jacking state and the beam bending moment in the bridge forming state being approximately the same, taking the jack lift force and jack arrangement position as the optimization variables, and standardizing the stress regulation of short-term condition members as the constraint. The results show that the optimization method can solve the problem of negative reaction force on the support that cannot be solved by the rigid constraint method of the jack and the action position of the jack can be used as an independent variable to participate in the optimization.
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