摘要
针对桥梁设计过程中存在的多样性、多维性和不确定性,以普通钢筋混凝土T型梁结构优化为例,建立基于多目标模糊优化的桥梁结构设计计算方法。采用单目标优化进行约束分类,利用水平截集法将模糊约束区间转化为实数域的普通集合,选取模糊集合隶属度函数实现多目标优化向常规单目标优化问题,并基于目标函数的非线性特征,引入遗传算法实现全域最优解的计算。通过实例验证表明:采用多目标优化计算能够提高截面刚度13%,降低工程造价2. 6%。在满足桥梁设计安全的同时,降低了桥梁建设成本。
in view of the diversity,multi-dimension and uncertainty in bridge design,a calculation method of bridge structure design based on multi-objective fuzzy optimization is established by taking the ordinary reinforced concrete T-beam structure optimization as an example.The single objective optimization is used to classify the constraints,the level cut set method is used to transform the fuzzy constraint interval into the ordinary set of real number domain,and the membership function of the fuzzy set is selected to realize the multi-objective optimization to the general single-objective optimization problem.Based on the nonlinear characteristics of the objective function,genetic algorithm is introduced to calculate the global optimal solution.The example shows that the cross-section stiffness can be improved by using multi-objective optimization calculation.Reduce the project cost by 2.6.In order to meet the safety of bridge design,the cost of bridge construction is reduced.
作者
原二保
刘苗
YUAN Erbao;LIU Miao(Shanxi Architecture College,Jinzhong,Shanxi 030006,China;Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China)
出处
《公路工程》
北大核心
2019年第1期81-85,共5页
Highway Engineering
基金
山西省科技厅软科学项目(2016041004-4)
关键词
多目标
模糊优化
桥梁设计
隶属度
multi-objective
fuzzy optimization
bridge design
membership degree
