Selection of Construction Machine bu Considering Time-Cost Trade-off Problem


BETTEMİR Ö. H., ÖZDEMİR E., EREN SARICI D.

Journal of Construction Engineering, Management & Innovation (Online), cilt.4, sa.3, ss.173-186, 2021 (Hakemli Dergi) identifier

Özet

In this study, a decision support system is developed to aid selection of earthwork equipment. Physical and economical attributes of five off the shelf dozers, three excavators, and seven hydraulic hammers are entered to a spreadsheet application. Seven seismic velocity-mechanical property relationships of rock and stiff soil are derived from the literature and defined to the spreadsheet application. Mechanical properties of the soil samples obtained from the construction site are entered to the relevant data cells and seismic velocity to be measured at the field is estimated. Developed system estimates the ripper outputs of the dozers by using ripper production charts, cost and duration of the earthwork task is computed and likelihoods of the feasibility of the construction machines are estimated. Developed system takes the construction duration into account and solves time-cost trade-off problem for the selection of the best construction machine. Developed methodology is implemented on the excavation of the foundations of a mass public housing project with 72 houses. Utilization of ripper production charts without performing seismic velocity tests become possible by the proposed method. Furthermore, time cost trade-off problem is formed and solved without human interruption. The developed decision support system proposes the construction machine with least total direct and indirect costs. Contractors would be able to reduce their construction costs and gain competitive advantage on their rivals, if they implement the proposed system.