Robust Dual-Level Optimization Framework for Resource-Constrained Multiproject Scheduling for a Prefabrication Facility in Construction

Abstract

This research is intended to improve the current practice of resource planning and project scheduling at a prefabrication facility in construction, where engineered systems or components of large size and heavy weight are fabricated for multiple concurring projects with limited workplace and storage areas. A dual-level multiproject scheduling framework is proposed for optimizing resource allocation decisions and minimizing resource dependencies among multiple concurring prefabrication projects. A resource use robustness index is defined to quantitatively gauge interproject resource use dependencies in derived multiproject schedules. How to apply the proposed framework is demonstrated through a case study consisting of three projects sharing limited resources. Further, based on the same case study, the proposed framework is contrasted against (1) a single-project scheduling approach and (2) an open-source multiproject scheduling platform. Compared with those two methods, the schedule generated by the proposed dual-level multiproject scheduling method is the most robust in terms of achieving resource work continuity on individual projects. The proposed research provides production managers of fabrication facilities or project managers of prefabrication projects with more reliable and feasible work plans, which are conducive to ensuring crew work continuity on individual projects and enhancing resource utilization efficiency in a multiproject environment.