سهند فتحي

Time-Space conflicts are one of the most common issues facing construction practices, impacting productivity and safety in several negative ways. Generally, when two or more types of space, including the space required for construction machinery, temporary facilities, or activities, overlap over a while, the time-space interactions take place. Therefore, implementing and developing methods to reduce the frequency of such conflicts occurring in activity workspaces, can effectively enhance project performance. Over the recent decades, various simulation and scheduling techniques such as bar charts, Gantt charts and network-based scheduling techniques such as the Critical Path Method (CPM) have been utilized to improve time-space planning. However, these methods only consider activities’ temporal interferences in planning construction logistics, and neglect space which is usually a constrained resource in construction project sites. This study proposes a novel integrated approach as a method of time-space management in construction project sites. Our Proposed method implements Discrete Event Simulation (DES), Building Information Modeling (BIM), and Informed Rapidly-exploring Random Tree-Star (Informed-RRT*) path planning, to automatically detect, eva‎luate, and resolve time-space conflicts throughout construction projects. To eva‎luate the method’s capabilities, we have tested it on a case study of an earthwork operation, including 2 phases of loading, and dumping. Our case study considers several constraints, such as the number of loaders and spotters assigned to the hauling trucks at a time, and the trucks travel priorities. In addition, materials and equipment are randomly placed on the construction site as obstacles. Finally, Using Informed-RRT* and trigonometry rules, our discrete event simulation algorithm finds the travel route and duration, as well as the distance between the starting and ending points and the shortest path for each hauling truck, while avoiding collision with the other trucks and the obstacles. Besides, design and virtual reality (VR) tools have been used to display and provide a platform for visualization and better understanding of the proposed route.

برنامه‌ريزي زمان-فضا , مدل‌سازي اطلاعات ساختمان , برنامه‌ريزي مسير , شبيه‌سازي رويداد گسسته , بهينه‌سازي , واقعيت مجازي

Time-space Planning , Building Information Modeling , Path Planning , Discrete Event Simulation , Optimization , Virtual Reality

Sahand Fathi

Mostafa Khanzadi