Title Development of an Algorithm for Automatic Quantity Take-off of Slab Rebar
Authors Kim, Suhwan ; Kim, Sunkuk ; Suh, Sangwook ; Kim, Sangchul
DOI https://dx.doi.org/10.6106/KJCEM.2023.24.5.052
Page pp.52-62
ISSN 2005-6095
Keywords Automated Algorithm; Rebar Quantity Takeoff; Slab Rebar; Precise Cutting Length; Bar Bending Schedule
Abstract The objective of this study is to propose an automated algorithm for precise cutting length of slab rebar complying with regulations such as anchorage length, standard hooks, and lapping length. This algorithm aims to improve the traditional manual quantity take-off process typically outsourced by external contractors. By providing accurate rebar quantity data at BBS(Bar Bending Schedule) level from the bidding phase, uncertainty in quantity take-off can be eliminated and reliance on out-sourcing reduced. In addition, the algorithm allows for early determination of precise quantities, enabling construction firms to preapre competitive and optimized bids, leading to increased profit margins during contract negotiations. The proposed algorithm not only streamlines redundant tasks across various processes, including estimating, budgeting, and BBS generation but also offers flexibility in handling post-contract structural drawing changes. In particular, the proposed algorithm, when combined with BIM, can solve the technical problems of using BIM in the early phases of construction, and the algorithm's formulas and shape codes that built as REVIT-based family files, can help saving time and manpower.