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Title: Non-linear time-cost trade-off models of activity crashing: Application to construction scheduling and project compression with fast-tracking
Authors: Ballesteros-Perez, Pablo
Elamrousy, Kamel Mohamed
Gonzalez-Cruz, M. Carmen
Keywords: Time-cost trade-off
Issue Date: 2018
Publisher: © Elsevier
Citation: BALLESTEROS-PEREZ, P., ELAMROUSY, K.M. and GONZALEZ-CRUZ, M.C., 2018. Non-linear time-cost trade-off models of activity crashing: Application to construction scheduling and project compression with fast-tracking. Automation in Construction, 97, pp. 229-240.
Abstract: When shortening a project’s duration, activity crashing, fast-tracking and substitution are the three most commonly employed compression techniques. Crashing generally involves allocating extra resources to an activity with the intention of reducing its duration. To date, the activity time-cost relationship has for the most part been assumed to be linear, however, a few studies have suggested that this is not necessarily the case in practice. This paper proposes two non-linear theoretical models which assume either collaborative or non-collaborative resources. These models closely depict the two most common situations occurring during construction projects. The advantages of these models are that they allow for both discrete and continuous, as well as deterministic and stochastic configurations. Additionally, the quantity of resources required for crashing the activity can be quantified. Comparisons between the models and another recent fast-tracking model from the literature are discussed, and a Genetic Algorithm is implemented for a fictitious application example involving both compression techniques.
Description: This paper is in closed access until 19th Nov 2019.
Sponsor: This research was supported by the CIOB Bowen Jenkins Legacy Research Fund (reference BLJ2016/BJL.01) and by NERC under the Environmental Risks to Infrastructure Innovation Programme (reference NE/R008876/1) at the University of Reading.
Version: Accepted for publication
DOI: 10.1016/j.autcon.2018.11.001
URI: https://dspace.lboro.ac.uk/2134/36192
Publisher Link: https://doi.org/10.1016/j.autcon.2018.11.001
ISSN: 0926-5805
Appears in Collections:Closed Access (Architecture, Building and Civil Engineering)

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