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Novel Hybrid Method in Time–Cost Trade-Off for Resource-Constrained Construction Projects

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Iranian Journal of Science and Technology, Transactions of Civil Engineering Aims and scope Submit manuscript

Abstract

Time and cost are two of the most important issues for construction planning. Nowadays, the relationship between time and cost becomes more crucial due to the competitive conditions. The contradiction of these two project factors which are affected by the various project constraints needs to be balanced. In this study, time–cost trade-off (TCT) problem is considered as a multi-objective problem. To solve TCT, a novel hybrid algorithm (NHA) is suggested. This method, which is developed by hybridization of particle swarm optimization (PSO) and genetic algorithm, is compared on the application with standard PSO. NHA, which is expected to be more efficient in terms of avoiding local best points and searching the solution space, also presents shorter and more economical alternatives of the project.

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Abbreviations

c :

Acceleration coefficient

gbest(t):

Best position in the swarm at the time of “t

c ij :

Cost of the activity ith of the mode jth

vi(t):

The velocity of the particle “i” at the time of “t

lbest(t):

Best local position at the time of “t

mn :

Mode alternatives

rj(t):

Stochastic random number

t t :

Total duration of the project

T ij :

Duration of jth mode of ith activity

T n :

Starting time of nth activity

T max :

Maximum completion time

w :

Inertia coefficient

xi(t):

The position of particle “i” at the time of “t

x ij :

Decision variable of the jth mode for ith activity

y g :

Global best position at the time of “t + 1”

y i :

Local best position at the time of “t + 1”

GA:

Genetic algorithm

NHA:

Novel hybrid algorithm

PSO:

Particle swarm optimization

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Correspondence to Gülçağ Albayrak.

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Albayrak, G. Novel Hybrid Method in Time–Cost Trade-Off for Resource-Constrained Construction Projects. Iran J Sci Technol Trans Civ Eng 44, 1295–1307 (2020). https://doi.org/10.1007/s40996-020-00437-2

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  • DOI: https://doi.org/10.1007/s40996-020-00437-2

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