BIM-Based 4D Modeling and Scheduling - Construction Project Scheduling and Control - page 399

Figure 15.5 Work flow for creating a 4D model
model, a 5D model integrates cost information to estimate the final cost of a project.
A 5D model estimates the project's cost by utilizing material quantities that are auto-
matically generated from the preconstructed 3D building model. A 5D model uses
data stored in the 3D model by retrieving the stored information and incorporat-
ing that information into the cost estimation process. A 5D model allows generation
of quantity takeoff, estimating of a project's final cost, interactive forecasting of a
project's cash flow, comparing of the target and actual costs, and generation of cost-
loaded schedules. Also, while a 4Dmodel has the ability to reflect the actual progress of
construction works as a project updated-schedule, a 5D model adjusts the cost estima-
tions based on the actual conditions of the project. It enables architects, contractors,
and clients to automatically visualize how the cost of the project can change with vary-
ing project conditions, that is, with variations in the project's design or reworking of
building components. In other words, as the project progresses, any variations in the
3D model can automatically be reflected in the 5D model, and cost estimations can
easily be updated.
CASE STUDY
Project Information
The project is a nine-story building that consists of nine floors with two apartments on
each floor and one basement floor that is used as a parking garage. The building itself