Multicriteria optimizing of construction equipment selection by AHP method

Abstract

Construction equipment is a key resource in the realization of construction projects. Correct and careful planning in the usage of construction equipment plays a vital role in the economic success of every construction project and has a key impact on the profitability of construction companies. Due to the lack of scientificaly based approach and undeveloped practical methods for construction equipment selection and optimization, the choice of equipment is mainly based on the manufacturer’s recommendations and the contractor’s intuition in selecting the type, brand and model of equipment. This paper discusses a model for selection of an optimal set of construction machines. The optimization is based on a multi criterion method – the Analytical Hierarchy Process or AHP. The selection of the optimal combination starts by forming a set of all the technologically possible combinations, generated by CESAD software. Thereby forming a method for selection of the optimal combination of equipment. The method is based on the mutual comparison of alternatives by using the selected criteria functions which are defined by the user at the start of each optimization. The proposed method has been tested on a real case – earthworks for construction of embankment on a highway section on Corridor X in Serbia between Nis and Dimitrovgrad. Possible combinations were generated by CESAD software. The criteria functions in this case were based on output, unit price and profit per unit of embankment. A sensitivity analysis was performed to check the sensitivity of the final decision subject to minor changes in the criteria functions.