A practical model for scheduling and cost optimization of repetitive projects is proposed in this paper. The model objective is to minimize total construction cost comprising direct cost, indirect cost, interruption cost, as well as incentives and liquidated damages. The novelty of this model stems from four main aspects: (1) it is based on full integration of the critical path and the line of balance methodologies, thus considering crew synchronization and work continuity among nonserial activities; (2) it performs time-cost trade-off analysis considering a specified deadline and alternative construction methods with associated time, cost, and crew options; (3) it is developed as a spreadsheet template that is transparent and easy to use; and (4) it utilizes a nontraditional optimization technique, genetic algorithms, to determine the optimum combination of construction methods, number of crews, and interruptions for each repetitive activity. To automate the model, macroprograms were developed to integrate it with commercial scheduling software. Details of the model are presented, and an example project is used to demonstrate its benefits.
[1]
Rehab Reda,et al.
RPM: Repetitive Project Modeling
,
1990
.
[2]
Alan D. Russell,et al.
Extensions to Linear Scheduling Optimization
,
1988
.
[3]
Khaled A El-Rayes,et al.
Scheduling of repetitive projects with cost optimization
,
1993
.
[4]
Richard Neale,et al.
CPM/LOB: New Methodology to Integrate CPM and Line of Balance
,
1994
.
[5]
Shlomo Selinger.
Construction Planning for Linear Projects
,
1980
.
[6]
Ahmed Senouci,et al.
A time – cost trade-off algorithm for nonserial linear projects
,
1996
.
[7]
Chung-Wei Feng,et al.
Using genetic algorithms to solve construction time-cost trade-off problems
,
1997
.
[8]
Peter E.D. Love,et al.
Using improved genetic algorithms to facilitate time-cost optimization
,
1997
.