Abstract
Construction scheduling is a complex process that features multitudinous sequences of various tasks or activities necessary to accomplish the project within the stipulated duration. Furthermore, determining the parameters influencing construction scheduling, such as the type of construction activities, its duration, dependency relationship, associated probability of occurrence are arduous and uncertain. Hitherto, construction project scheduling predominantly depends on traditional methods, namely Program Evaluation and Review Technique (PERT), Critical Path Method (CPM), Precedence Diagramming Method (PDM) and so on. However, these prevailing scheduling techniques fall short in ascertaining the precarious parameters to establish accurate schedules. Consequently, a more competent approach is required to address the fuzziness and stochastic characteristics of construction schedules. This research proposes integrating Graphical Evaluation and Review Technique (GERT) and Fuzzy Logic (FL) to create Fuzzy-based GERT (F-GERT) for scheduling construction projects. F-GERT utilizes fuzzy operations to handle uncertainty in activity durations. Initial application to a two-storey residential building project demonstrates proximity to the as-built schedule. To reinforce the applicability of F-GERT, it is incorporated for scheduling forty-five real-time construction projects and accuracy is evaluated by comparing it with the actual project duration. The results show the significance of the proposed method in comparison with the existing methods.
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Abbreviations
- a1, a2, a3, a4 :
-
Quaternary parameters such that 0 ≤ a1 ≤ a2 ≤ a3 ≤ a4
- L n :
-
Number of paths that start from a source node and terminate in the same sink node
- \(\tilde{S}\) :
-
A fuzzy set
- \(\tilde{T}_{ij}\) :
-
Completion time of ith source node, and jth sink node
- T e :
-
Defuzzied completion time of the network
- \(\tilde{T}_{e}\) :
-
Completion time of the network in TFN
- \(\tilde{t}_{i}\) :
-
TFN of ith activity’s duration time
- \(\tilde{t}_{si}\) :
-
TFN of the start time of ith activity’s duration time
- μ(x):
-
Membership function
- p i :
-
Probability of completing the ith activity
- \(p(\tilde{T}_{e}=\tilde{T}_{ij})\) :
-
Arbitrary variable probability function of network completion time
- p si :
-
Probability of the source node
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The authors would like to sincerely thank the technical experts and their organizations for their extended support and cooperation in providing valuable information regarding this research work. The contribution of various academicians, construction personnel, contractors, construction workers, and discussants, directly and indirectly during the construction field survey and interpretation are also highly regarded. The authors would like to thank the Editor in Chief, Associate Editors, and all the Reviewers of KSCE Journal for their valuable time, insightful comments and constructive suggestions that greatly contributed to enhancing the quality of this article.
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Pregina, K., Kannan, M.R. Fuzzy-Graphical Evaluation and Review Technique for Scheduling Construction Projects. KSCE J Civ Eng (2024). https://doi.org/10.1007/s12205-024-0904-z
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DOI: https://doi.org/10.1007/s12205-024-0904-z