基于遗传算法的建筑工程三大目标综合优化

工期、成本和质量是建筑工程的三大主要目标，他们能否顺利实现将直接影响项目总体目标的好坏，而以往提出的模型大都是侧重于对工期一成本两目标的综合优化，很少涉及质量目标，这显然是满足不了现实要求的。因此在这里提出了一个对三大目标综合优化的模型，它是在工期一成本、工期一质量为线性关系的基础上建立的，并且以综合目标函数作为适应度函数建立的依据，运用遗传算法进行求解。最后用一个实例验证了此模型的可行性，并且运算之后可以得到多组解，决策者可以根据自己的偏好选择自己满意的一组解。

COMPREHENSIVE OPTIMIZATION FOR THREE MAIN OBJECTIVES IN CONSTRUCTION BASED ON GA

Duration, cost and quality is the three main objectives of the construction. The performance of these three objectives can directly affect the entire target of the project . The best solution for a project is to achieve high quality with low cost in a proper time limit. But the previous model which could only resolve the time-cost trade-off problems that cannot satisfy decision makers＇ requirement. The objective of this paper is to present the development of an advanced multi-objective optimization model that supports minimizing construction time and cost,while maximizing its quality. The model is established on the base of the relationship of time-cost/time-quality is linear relationship, and is resolved by Genetic algorithm. An application example is analyzed to illustrate the use of the model and demonstrate its capabilities in generating and visualizing optimal tradeoffs among construction time, cost and quality,and it can give multiple solutions with each running. Decision makers can choose a solution according to their preferences.