Consequently, accurate and faster formwork quantification results and generic formwork models are automatically obtained. A case study is presented, and the results obtained from the presented algorithm are verified with the manual operation of the BIM quantification features as well as manual calculations for some elements. Therefore, this publication describes how the extraction of formwork quantities and the creation of formwork models can be automated with Autodesk Revit Dynamo. Moreover, automated formwork generation is not supported by the majority of BIM tools although it is also a time consuming task and necessary for construction phase planning, visualization, and interference check.
It is important to note that QTO is needed during several phases of the design and construction process, with differing requirements and available information. This is mainly due to lack of modeling conventions, agreed workflows, and classification, together with modeling errors like overlapping structural elements and limitations of BIM software. According to literature, the accurate, automated calculation of formwork areas from BIM remains still problematic. Therefore, the use of BIM for QTO is increasing. However, obtaining accurate QTOs from 2D traditional drawings is tedious and time-consuming. Quantity take-off (QTO) is an indispensable part of construction projects since it is used for scheduling and cost calculation.
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