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Interruptability analysis for linear scheduling with singularity functions

conference contribution
posted on 2013-06-01, 00:00 authored by Hong Xian LiHong Xian Li, X Zhou, D Morley, G Lucko
It is a widely held assumption in the construction industry that activities, especially those involving labor crews, should be scheduled to be performed continuously until they are completed. In certain scenarios, however, depending on the production rates of the adjacent activities, a strategic intentional interruption of an activity can create opportunities to improve the overall schedule by reducing the overall duration of the project. This paper analyzes the possibility of intentionally interrupting activities with either constant or variable production rates, in order to minimize the project duration; the objective. For activities exhibiting a constant production rate, a heuristic approach which allows for the feasibility of interrupting activities to be determined based on scenario analysis, and thru application of geometry, attainment of the objective. For activities exhibiting a variable production rate, a mathematical model employing singularity functions is developed, extending the previous geometrical approach and allowing for computer implementation. Genetic algorithms (GA) are applied in order to achieve the objective. The use of singularity functions allows for complex activities to be modeled, including all changes in production rates and work breaks, with a sole functional expression, greatly reducing the number of constraints that need to be implemented in the optimization model. A complex case example is presented, illustrating how the model can be applied to intentionally interrupt activities allowing for a large reduction in overall project duration.

History

Event

Construction Specialty. Conference (4th : 2013 : Montréal, Canada)

Series

Construction Specialty Conference (ICSC)

Pagination

1 - 11

Publisher

Canadian Society for Civil Engineering

Location

Montréal, Canada

Place of publication

Montreal, Canada

Start date

2013-05-29

End date

2013-06-01

ISBN-13

9781894662222

Language

eng

Publication classification

E Conference publication; E1.1 Full written paper - refereed

Copyright notice

2013, Canadian Society for Civil Engineering

Title of proceedings

ICSC 2013 : Proceedings of the 4th Construction Specialty Conference

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