关键词: 项目群, 资源约束, 南水北调工程, 资金的时间价值, 工期-费用权衡

Abstract: Since 2015, the National Development and Reform Commission, the Ministry of Foreign Affairs and the Ministry of Commerce jointly released the Vision and Actions for Promoting the Building of the Belt and Road Initiative. Afterwards, more and more large and medium-sized construction projects are undertaken at home and abroad. In order to make sure that the three control objectives of duration, cost and quality can be implemented successfully, the program management of large and medium-sized construction projects came into being. Based on this, this paper focuses on the duration-cost optimization of program, and establishes a time-cost optimization model before the implementation of the program under the condition of resource constraints, then the initial network plan is optimized. After that, taking the penalty fee (f(T_#em/em#)) into consideration, which is proposed by the employer to the contractor due to the delay of the bidding section on the non-critical path, the duration-cost optimization model during the implementation of the program is constructed, then the optimized network plan before implementation is dynamically adjusted, so that the net present value of the employer's payment can be minimized. Finally, the results of different duration-cost optimization are illustrated by an example:program X of South-to-North Water Diversion. The results show that the two-stage proposed model can actualize the optimization of program's cost control objective and provide the basis for the employer to determine the starting time of each bidding section in the program. In this way, the program optimization theory can be further improved.