بهنام عبدزاده ضيابري

Nowadays, organizations in the construction industry require a variety of resources and materials owing to their engagement in many projects. In such organizations, a primary concern for managers regarding the timely completion of the projects is the availability of materials at the appropriate time and at an acceptable cost. Therefore, project planning is closely related to material management and planning in project-based organizations. As a result, this research aims to provide a model for integrating project scheduling with material procurement plans through the use of project supply chain concepts. In this model, the relationship between the start-time of project activities and decisions such as material routing and supplier selection is considered. Furthermore, decisions about various components of the construction supply chain are made considering the quality of the materials. Actually, this model simultaneously decides on project scheduling, supplier selection, and transportation routing while paying attention to the quality concept in the processes of the project supply chain. The model aims to create a balance between the resource utilization cost, the transportation cost, and the projects' delay cost. In this research, the quality of raw materials depends on their price and affects the closing time of the projects. We apply both a deterministic and a stochastic method to model the quality concept. The deterministic approach addresses the rework time of the project activities as a function of the materials' quality, while the stochastic approach assumes the rework probability of the activities depending on the materials' quality. Since the research model in the deterministic approach is complicated, a method based on the tabu search algorithm is presented to solve it. The proposed solution method's efficiency has been eva‎luated in small-scale and large-scale instances using exact solvers and the results of similar research, respectively. However, in the stochastic approach, there are non-deterministic parameters in the model, such as the replacement probability of materials or the rework time of activities. Therefore, a simulation-based optimization method has been proposed to deal with the model in the stochastic approach, and we have measured its efficiency in different ways. Finally, with the aim of showing the applicability of the research, a case study has been investigated using the data related to a mass construction company. The results of this case study show that the research model not only provides a better balance between the costs of the project supply chain but also makes the project plan more feasible.

زنجيره تأمين ساخت‌وساز , زمان‌بندي چندپروژه‌اي , انتخاب تأمين‌كننده , مسيريابي حمل مصالح , كيفيت مواد اوليه , دوباره‌كاري

Construction Supply Chain , Multi-project Scheduling , Supplier selection , Material Transportation Routing , Quality of Non-renewable Resources , Rework

Behnam Abdzadeh-Ziabari

Dr. Siamak Noori