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Can Ersen F?rat, Juhani Kiiras, Kalle Kähkönen, Pekka Huovinen

Model based scheduling in building projects – is it oxymoron?

Abstract: In building, most projects are still planned and scheduled based on the randomly accumulated, contextual experience among planners and managers. The key inputs for scheduling tasks, i.e. the dependencies, man-hours, and durations of activities may have never been organized well in the focal planner’s mind. The aim of the paper is to intro-duce some new viable ways of modeling scheduling activities in the context of building based on the integration of a product model, a process model, and complementary IT solutions. The integrative rationale of the new Building Con-struction Information Model (BCIM) is herein justified in terms of combining the building product model, the building construction resource and cost model, and the building construction process model. Some new feasible ways of auto-mating building project planning are explored, in particular in terms of using template schedules to automate schedul-ing activities as part of the advancement and exploitation of the suggested BCIM.

Keywords: building projects, information technology, modeling, process models, product models, scheduling

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Full text: content.pdf (759,119 bytes) (available to registered users only)

Series: w78:2007 (browse)
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Can Ersen Firat, David Arditi, Juho-Pekka Hamalainen, Johan Stenstrand, Juhani Kiiras

Quantity Take-Off in Model-Based Systems

Abstract: In recent years, as Information Technology (IT) tools and Building Information Models (BIM) are adopted by more practitioners, it has become apparent that it is possible to have a faster and more efficient quantity take-off system. The efficiency of quantity take-off lies in the smart transfer of the information produced in the design process to construction. Existing BIM-based quantity take-off is performed in the design phase of a project. BIM-based systems provide a smart platform for information exchange between design and construction.A “model-based” system refers in this paper to a Building Construction Information Model (BCIM)coupled with a location-based scheduling process.BCIM offers an environment in the construction phase, where data are stored, updated, and reused via the evolving project libraries of a building contractor. BCIM is composed of three submodels:(i) a building product model that provides the sections and quantities, (ii) a building resource and cost model that provides activity lists and labour consumptions to calculate activitydurations, and (iii) a building process model that introduces the interdependencies of the activities.· In the location-based scheduling process, a preliminary master schedule is obtained automaticallyfrom an information database, and then improved by the planner to fit the conditions of the company and of the project. The use of Advanced Line of Balance (ALoB) is proposed in location-based scheduling.The objective of this paper is to introduce the principles involved in quantity take-off in a “modelbased” system as implemented by a contractor. The paper consists of three parts: (1) the “modelbased” system (composed of BCIM and ALoB) is introduced as the theoretical background; (2) the steps in performing quantity take-off in “model-based” systems are described; and (3) a residential construction project is used to test the proposed quantity take-off principles.

Keywords: building information modeling, BIM, model-based systems, location-based scheduling, quantity take-off

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Full text: content.pdf (311,580 bytes) (available to registered users only)

Series: w78:2010 (browse)
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Wafa Alsakin, Teppo Salmikivi, and Juhani Kiiras

Enlarged Role Of Specialty Systems Contractors In A Fully Virtual (Digitalized) Supply Network

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Full text: content.pdf (660,496 bytes) (available to registered users only)

Series: w78:2006 (browse)
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Wafa Alsakini, Juhani Kiiras, and Pekka Huovinen

IS/IT Strategy Of A Virtual Construction Management Services Company

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Full text: content.pdf (610,882 bytes) (available to registered users only)

Series: w78:2006 (browse)
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