Trade- off between robustness of a construction schedule and project completion time
Artykuł w czasopiśmie
| Status: | |
| Autorzy: | Jaśkowski Piotr, Biruk Sławomir |
| Rok wydania: | 2011 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 20 |
| Wolumen/Tom: | 4 |
| Strony: | 205 - 215 |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| Construction projects often distrupted by factors that are difficult to predict and control, like adverse weather or defect of equipment. Changes to the program introduced in reaction to disruption result in difficulties with managing subcontractors and suppliers. Futhermore, a failure to conform to the contract due date and milestones is usually connected with penalties.Thus, probabilistic nature of construction processes and possible negative effects of risk factors should be considered at the planning stage. The aim of the planner should be to design a schedule with a realistic completion time and fixed processes' start dates. These should be achievable during project execution even if undesirable conditions occur. A common practice is buffering, aimed at protecting the completion of an activity or a project on time.The paper focuses on the trade-off between schedule robustness and short completion time.The infuence of the assumed project makespan on buffer size and stability of the schedule was illustrated by an example. A sample network model was analyzed by means of simulation to evaluate the schedule robustness measured by the schedule instability cost. Time buffers were located in front of processes and their sizes were determined by means of heuristic method proposed by the authors. The method accounts for process variability and considers unit costs of process start time distruption. |
