title: BIM-Based quantity takeoff. Assessment of accuracy and time efficiency
title: Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ°Ñ Ð´Ð¸ÑÑÐµÑÑÐ°ÑÐ¸Ñ
titleType: Subtitle
Creators: name: Shick Alshabab, Mary
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2017
Subjects: ÐÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½ÑÐµ Ð¼Ð°ÑÐ¸Ð½Ñ ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½ÑÐµ
ÐÐ²ÑÐ¾Ð¼Ð°ÑÐ¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ð½ÑÐµ ÑÐ¸ÑÑÐµÐ¼Ñ Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ
ÐÐ´Ð°Ð½Ð¸Ñ Ð¸ Ð¿Ð¾ÑÑÑÐ¾Ð¹ÐºÐ¸
ÐÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½ÑÐµ Ð¼Ð°ÑÐ¸Ð½Ñ ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½ÑÐµ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»ÑÐ½ÑÐµ

description: This research paper is designed to give practical solutions and recommendations to designers,quantity surveyors and estimators who use Autodesk Revit and Autodesk Navisworks Manage to designbuildings models and to extract the materials quantities of these models in a way that insures the accuracyof the quantities and minimize the time consumed during this process.The theoretical study covered 11 models and 27 cases taking into account various assemblies ofbuilding elements represented by variable X and different methods and solutions to design theseassemblies represented by variable Y, while variable Z was used to express the technical condition of theelements assembly such as connection, intersection or partially embedded. For each case the Surface Areaand the Volume of the assemblies were taken off in Revit and Navisworks Manage and compared to themanually calculated quantities to calculate the deviation.
description: The time consumed to design and takeoff thematerials in each case was also calculated. The methods were then compared in terms of accuracy andtime efficiency. In result of the theoretical study the tools and commands that are recommended to usefor the design of various categories of building elements were presented, in addition to the suggested wayto extract the quantities.During the practical study, the results of the theoretical study were tested on a bigger scale bydesigning and extracting the quantities of a multistory residential building once without taking thetheoretical recommendations into consideration and another time taking them into account. It was shownthat not following the recommendations can cause deviations in quantities in Revit between (1-33) % andin Navisworks Manage between (1-247) %, while designing the different building categories and extractingtheir quantities according to the recommendations will insure 0.0 % deviation from real values. Byfollowing the suggested scheme of workflow during designing the architectural and structural models ofthe building, the time consumed for designing and taking off quantities was (2-4) times minimized.
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