Browsing by Author "Kung, Cheng-Ju"

Now showing 1 - 2 of 2

Applying building information modeling to integrate schedule and cost for establishing construction progress curves
(2016-12)
Wang, Kun-Chi
;
Wang, Wei-Chih
;
Wang, Han-Hsiang
;
Hsu, Pei-Yuan
;
Wu, Wei-Hao
A cost-based progress curve (called S-curve) is often used to control construction project schedules. To establish a progress curve, the costs that are associated with each scheduling activity must be determined. However, the distributions of the quantities (costs) of cost items among various activities are time-consuming to obtain and error prone, yielding an unreliable S-curve. This work proposes the use of three-dimensional building information model (BIM) objects to integrate schedule and cost by using the powerful BIM for data acquisition and storage. BIM objects are incorporated into a proposed four-step model to establish construction progress curves. The proposed model defines search criteria (cost item, object, floor, and zone) that precisely identify takeoff objects for extracting the quantities of cost items associated with each activity. The BIM uses keynote, assembly code, and family type catalog functions to provide pop-up menus for the efficient identification of cost items that are associated with each object to preventing errors in the manual typing of cost-item names. Finally, this work demonstrates that uploading the cost items and unit prices into cost estimation software in advance is critical to automating cost estimations in BIM. (C) 2016 Elsevier B.V. All rights reserved.
Establishing Construction Scheduling Progress Curve based on Buidling Information Modeling Quantity Takeoffs
(2015-01-01)
Wang, Kun-Chi
;
Wu, Wei-Hao
;
Hsu, Pei-Yuan
;
Gansonre, Abdoul-Aziz
;
Wang, Wei-Chih
A cost cumulative progress curve (called S-curve) is often used as a basis for effective schedule control which is a key to the success of construction projects. In establishing a planned S-curve of a construction project, the cost of each scheduling activity must be determined. Furthermore, the contractual costs associated with the cost items should be fully distributed to all scheduling activities. However, the relationships between scheduling activities and cost items are complex because these relationships may be 1-to-1, many-to-1 or many-to-many relations. This research proposes a searching algorithm to conduct quantity takeoffs in Revit and QTO to facilitate the establishment of the planned S-curve. The proposed search algorithm defines different search steps (using various searching parameters, such as "floor", "physical object", "cost item", and "area") to identify corresponding cost items associated with different types of activities. The benefits of the proposed algorithm is demonstrated by applying it to a high-tech facility building in northern Taiwan.