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成本-效益准则是基于性能的抗震设计的重要原则,该准则在设计中除了考虑技术要素外,还考虑经济、社会等诸多因素,它所追求的设计目标为结构在其寿命周期内的总造价最小。因此,结构全寿命造价评估是基于性能的抗震设计的基本问题。在已有全寿命造价优化模型的基础上,提出了三目标函数全寿命造价优化模型。与已有的全寿命造价模型相比,该模型除考虑结构初始造价、损失期望外,还考虑了反映结构设计与施工复杂性的构件截面类型数量;另外,还将结构在其运行期间的检查、维护费用及由于优化导致建筑使用面积变化所引起的租金收益影响也列入到结构全寿命造价中。最后,基于所提出的优化模型,给出了以多目标遗传算法为搜索引擎、运用MATLAB语言开发的高层RC框架结构基于成本-效益准则的自动优化程序流程图。
The cost-benefit criterion is an important principle of performance-based seismic design. In addition to considering technical factors, this criterion also considers economic and social factors. The design goal it pursues is the total cost of the structure over its life cycle Min. Therefore, the assessment of structural lifetime cost is the basic problem of performance-based seismic design. Based on the existing life-cycle cost optimization model, an optimization model of lifetime cost of the three-objective function is proposed. Compared with the existing life-cycle cost model, this model not only considers the initial cost and loss expectation of the structure, but also considers the number of cross-section types that reflect the complexity of the structure design and construction. In addition, the inspection of the structure during its operation , The maintenance cost and the rental income impact caused by the change of the building area due to the optimization are also included in the construction life-cycle cost. Finally, based on the proposed optimization model, a flow chart of automatic optimization based on cost-benefit principle is given for multi-objective genetic algorithm as search engine and high-level RC framework developed by using MATLAB language.