| With the continuous emergence of safety problems in the field of engineering,the multi-objective management system of engineering projects has expanded to the overall management of construction period,cost,quality and safety,resulting in the multi-objective optimization problem of engineering projects for safety management.In order to better carry out the project management,this paper from the construction period,cost,quality,safety of these four management objectives,in order to maximize the benefit of the project as the research purpose,using the system reliability theory,genetic algorithm theory and multi-objective optimization theory,constructs the construction period-cost-quality-safety multi-objective optimization model,using the Pareto sorting fitness distribution theory and genetic algorithm principle to solve,and combined with QD residential project 16#residential building unit project to construct the multi-objective optimization model is applied.The main research results of this paper include the following sections:(1)The function model of time cost relationship based on incentive factors is constructed.Firstly,the relationship between construction period and cost of project is analyzed qualitatively.Secondly,considering the actual project,the indirect cost is reduced and indirect cost is increased by the contract period standard.The curve of the relationship between indirect cost and construction period of the project is clarified for quantitative analysis.Finally,the piecewise linear function model of indirect cost is established,and then the time cost relationship function model based on incentive factors is established.(2)Based on the system reliability theory,the quality and safety measurement system of engineering project is constructed.First,through the qualitative and quantitative analysis of the duration quality and safety cost relationship of a single process,the functional relationship of duration quality and safety cost are established respectively.Secondly,the analytic hierarchy process and expert evaluation method are used to estimate and calculate the process quality and safety parameters,depicting the corresponding quality and safety level of each process.On this basis,according to the system reliability theory,the quality and safety level of engineering project are measured,and finally the quantitative model of engineering project quality and safety is established.(3)The time cost quality safety multi-objective optimization model is constructed.On the basis of the first two parts,taking the construction period as the decision variable and the overall benefit of the project as the purpose,a multi-objective optimization model of construction period cost quality safety is established,which is composed of the cost construction period relation function,the quality construction period relation function and the cost safety relation function.(4)Taking the actual QD residential project 16#residential building unit project as an example for model application.By sorting out the relevant parameters of the project example,the construction period,cost,quality and safety objectives of the project are clarified,and the multi-objective optimization model of construction period,cost,quality and safety based on the unit project of QD residential project 16#residential building is constructed.The multi-objective genetic algorithm based on Pareto ranking is used to solve the optimization model.The solution of the model is simplified as:assuming that the safety goal is unchanged,the relationship among duration,cost and quality is discussed for graphical solution.Assuming that the quality objective remains unchanged,the relationship among duration,cost and safety is discussed and solved graphically.Finally,the results are analyzed uniformly,and a reasonable optimal solution is obtained according to the actual demand of the project:the duration is reasonably reduced,the cost is reasonably reduced,and the quality level and safety level are improved respectively. |
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