عنوان مقاله [English]
An accurate material quantity take-off and estimation are vital issues in various construction projects. Such an accurate estimating and material quantity take-off is required prior to initiating a project for tendering and bidding purposes, and during the construction phase for procurement and project control purposes. Thus, a number of Building Information Modeling (BIM) applications have been utilized recently not only for efficient material quantity take-off and estimating purposes, but also for other construction
engineering and management commitments (e.g., visualization, clash detection, 4D 5D planning, and virtual reality). The most common BIM applications can be named as ``Autodesk Revit'' and ``Tekla Structures'' for integrated modeling (e.g., structure, architectural, and MEP modeling) and ``Autodesk Navisworks Manage'' for site management and 4D Planning purposes. In this research, the accuracy of automatic quantity take-off, using aforementioned BIM applications, has been investigated. First, such an exercise is performed on simple steel and reinforced concrete elements modeled using Revit structural extension. Furthermore, this exercise is extended to steel and reinforced concrete 3D structures, modeled in both TEKLA and Revit structures. By recognizing the points of weakness of such BIM applications, some practical recommendations are provided to enhance the accuracy of automatic quantity take-off and estimation. Another side product of knowing the accuracy of automated material quantity take-off is providing a realistic estimate based on the utilized estimating approach and employing BIM software to avoid unplanned mistakes in estimating and quantity take-off.