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http://dx.doi.org/10.5345/JKIBC.2020.20.2.147

Conceptual Cost Estimate Method of Public Office Building Structural Frame Work by Regression Analysis  

Jo, Yeong-Ho (Department of Architectural Engineering, Gyeongsang National University)
Choi, Hyun-Jun (Department of Architectural Engineering, Gyeongsang National University)
Kim, Jung-Won (Department of Architectural Engineering, Gyeongsang National University)
Yun, Seok-Heon (Department of Architectural Engineering, ERI, Gyeongsang National University)
Publication Information
Journal of the Korea Institute of Building Construction / v.20, no.2, 2020 , pp. 147-153 More about this Journal
Abstract
It is important to estimate the optimal construction cost at the early stage of the project. In this regard, conceptual cost estimate is an important factor for estimate optimal construction cost. However, domestic conceptual cost estimate are only used as cost per unit area according to the building type, and it's accuracy is not high. Hence, the purpose of this study is to calculate the approximate quantity and cost for reinforcing bars, concrete, and formwork by presenting a regression formula based on the total floor area of the common work items in the frame work. In order to verify the accuracy and validity of the regression formula presented in this study, a comparative analysis was performed by applying the regression formula and the traditional approximate quantity take-off method to real cases. As a result, the estimated error rate of the traditional method was -102~+55%, and exceeded the estimated conceptual cost estimate accuracy range of -50~+100% suggested by AACE(American Association of Cost Engineering). On the other hand, the error rate of the regression formula method presented in this study was -6.4~+11.62%. This can be used not only for conceptual cost estimate range of accuracy, but also for detailed estimates. However, it is necessary to analyze the factors that affect the unit price as well as quantity in order to calculate the appropriate cost.
Keywords
structural frame work; bill of quantity; conceptual cost estimate;
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