Analysis of Cost Estimation Level from BIM Model and Development of QDB based Integrated Cost Management Model

Abstract

A change in the traditional construction cost management system is necessary for systematic construction cost management through BIM, but it has yet to present practical improvements. In this study, we would like to present a framework for information structure for Building Information Modeling(BIM)-based construction cost management. In order to analyze the differences between the traditional construction cost management system and the BIM-based construction cost management system, the level of development (LOD) was used to analyze how much existing Bill of Quantity(BoQ) can be satisfied through the BIM model. To this end, the level of availability of information in the BIM model was analyzed for the traditional BoQ of the construction work. Based on LOD 300, the analysis of the level of satisfying the traditional BoQ by utilizing the information that can be extracted from the BIM model showed that the level of information in the BIM model based on the number of items was 35%, and the impossible information was 20.8%. As a result of analyzing the ratio of construction costs, 22.68% of the BIM model's information was still available, and 10.31% of the information was impossible. Items that cannot be calculated will need to be incorporated into other items or improved by means of calculation using schematics. In addition to this level of information, it is necessary to improve the structure of traditional BoQ documents so that they can be utilized in conjunction with the BIM model. It was intended to present the framework of the information structure for the management of construction costs. This framework is constructed by adding element and space information that can be linked to the BIM model to the traditional BoQ, which enables the integrated operation of the BIM-applied construction cost management system as well as the traditional construction cost management system.