【摘要】 投资-效益准则是基于结构性能抗震设计的重要原则,它所追求的设计目标是在结构的初始造价与地震损失期望之间达到一种和谐的优化平衡,使结构在全寿命周期内总费用最小.在以上的单目标优化模型基础上,提出了考虑结构初始造价、损伤期望、检查和维护费用、拆除费用及残余价值和环境污染费用的多目标全寿命优化设计模型.基于所提出的多目标优化设计模型,应用精英保留非劣排序遗传算法,建立了以截面尺寸、纵筋和箍筋的配筋率为决策变量的近海桥梁结构全寿命抗震性能多目标优化设计模型,并给出了优化设计流程及具体实现.结果表明:得到的非劣解在目标空间分布均匀,算法收敛性和鲁棒性较好.更多还原

【Abstract】 Cost-benefit criterion is significant in performance-based seismic design.The objective of this criterion can make a reasonable and optimum balance between the initial cost of structures and potential loss expectation of structures,so as to minimize the total cost of structures in the whole life cycle.The multi-objective optimum design method based on single-objective optimum design method is firstly proposed considering initial cost,cost expectation,maintenance and inspection costs,dismantling fee,residual value and cost for potential environmental pollution.And then,elitist nondominated sorting genetic algorithm is used to establish life-cycle performance-based seismic design method for bridge structures by taking section size,reinforcement ratio of longitudinal reinforcement and stirrup as decision variables.The optimization design process and the concrete implementation are given in detail.The experimental results show the obtained non-inferior solution has uniform spatial distribution and the target algorithm has good convergence and robustness.更多还原