Optimization model for resource assignment problems of linear construction projects

For linear construction projects, it has long been known that resource utilization is i]mportant in improving work efficiency. However, most existing scheduling techniques cannot satisfy the need for solving such issues. This study presents a flexible model for resolving linear scheduling problems involving different objectives and resource assignment tasks. The proposed model adopts constraint programming (CP) as the searching algorithm for model formulation, and CP program implemented in this study creates the flexibility for optimizing either total cost or project duration. Additionally, the concept of outsourcing resources is introduced here to improve project performance.A bridge project from pertinent literature is selected, and model validation and two scenarios are conducted to demonstrate the model capability. According to the research results, consideration of outsourcing resources not only helps achieve diversity of resource supply but also creates a positive influence on the optimum solution by simultaneously reducing time and cost.