In addition, measurement rules standards are utilized to calculate QTO, including NRM 2 standards from the UK and SMPI standards from Indonesia, to calculate the cost based on Indonesia standard SNI-AHSP. Understanding the items was considered when examining the walls quantity to avoid missing information. This study analyzed the existing modeling based on the measurement rules and unit cost standards to analyze the problem which has been explained above. Besides that, the differences in standards used in analyzing the quantity and unit cost per work item made it more complicated. The interdependence among different work items involved, such as architects, civil and electrical works, is one of the fundamental reasons. The proposed method does not increase the geometries in the BIM model therefore, the file size of the model does not increase greatly, which stabilizes the software performance.Ĭonstruction projects have become increasingly complicated and challenging to manage in recent years, especially in analyzing the quantity and cost estimation of construction work to get accurate results and overrun costs. Accurate quantities of wall framings can be obtained while the time and cost of developing wall framings for quantity takeoff can be saved. This research contributes to developing an approach for quantity takeoff of wall framings that are not present in a BIM model. The results of the case study showed that the prototype system took 282 s to deliver accurate quantities of wall framings with deviations of 0.11 to 0.30% when compared to a baseline, and the file size of the BIM model after applying the proposed method was increased very slightly from 47.0 MB to 47.1 MB. A prototype system is developed and the proposed method is validated in an actual construction project. The quantities of wall framings are then embedded into the properties of drywall in the BIM model and hence they can be extracted directly from the BIM model. Building elements that overlap with the drywalls are subtracted from the drywall surfaces before calculation. Therefore, in this research, an automatic method is proposed for calculating quantities of wall framings from drywalls in a BIM model.
The increased geometries in a BIM model also slow down the software performance. Developing wall framing models under a tight schedule in the construction phase is time-consuming, cost-intensive, and error-prone. If BIM models from the design phases do not contain wall framing models, contractors or subcontractors cannot perform quantity takeoff for purchasing materials. Our research focuses on drywalls, which consist of wall framings and wall panels. However, the quality of BIM models affects the quality of BIM-based quantity takeoff. Quantity takeoff based on building information modeling (BIM) is more reliable, accurate, and rapid than the traditional quantity takeoff approach.
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