【摘要】 提出桥梁由于维护导致的维护间接成本改进模型,建立优化目标函数。在现有劣化模型基础上,研究桥梁结构在最优维护策略下寿命周期内的状态变化规律,以此为约束条件,提出全寿命优化设计方法的关键技术和设计框架,并编制相应的决策支持系统。桥面铺装属易损结构,其维护对交通将产生很大的干扰。以一座桥梁车道数(宽度)的决策为研究对象,根据桥梁全寿命设计理念,由桥面铺装的劣化-维护规律,对桥梁设计方案的决策进行新的尝试,证明了该方法的有效性和可行性。桥梁全寿命优化设计方法不但能考虑桥梁劣化和维护过程中的不确定性,而且能够合理规划桥梁服役期内的维护方案,平衡建造成本和维护成本,起到优化资源、保护环境的作用。更多还原

【Abstract】 An improved model considering the indirect maintenance cost due to maintenance interventions and a related optimal objective function are proposed.Based on the existing deterioration model,bridge condition is assessed and predicted with the optimal maintenance strategy employed as the boundary constraint.The key technique and framework of the life-cycle optimum design method are presented,and a computer code for an associated decision supporting system is developed.Bridge deck pavement can be easily damaged,and maintenance of the deck pavement will seriously affect traffic conditions.A numerical example about design of bridge lane(bridge width)is employed to demonstrate the effectiveness and feasibility of the proposed design method using the properties of deterioration-maintenance of bridge deck pavement.The life-cycle optimum design method not only incorporates parameter uncertainties and maintenance planning programs over service time,but also balances construction cost and maintenance cost,playing an important role in protecting the environments and optimizing social resources.更多还原