Technical Program Abstracts

(BIM) Building Information Modeling

NOTE: Program Subject to Change


(BIM-3355) Adaptation of AACE Cost Estimate Classification System to define BIM uses in infrastructure bidding

Author(s)/Presenters(s): Stefania Limp Muniz Correa; Dominique Quitete de Barros Mansur


Building Information Modeling (BIM) adoption, as well as the use of new technologies are gaining relevance in Brazilian construction industry, mainly at construction jobsites, where its benefits have already been proven. Given the increasing trend for developing innovation practices through infrastructure projects lifecycle, this article aims to discuss and exemplify the adaptation of AACE Cost Estimate Classification System in order to guide Building Information Modeling uses during the bidding stages of a Brazilian general contractor. By adopting the methodologies, it was possible to structure and standardize bidding processes, delivering better value engineering, and providing the owner high-quality analysis given the use of technology.

(BIM-3426) Using 4D Modeling to Perform Critical Path Analysis for Delays

Author(s)/Presenters(s): Christopher W. Carson, CEP DRMP PSP FAACE; Sadia Janjua, PSP; Wes Beaumont


Historically 4D modeling has been used primarily to compare the as-built and the as-planned condition, providing a comparison presentation that does not provide any analysis.  With the increased clarity available in using a 4D model, this paper shows a practical process that provides Critical Path Method (CPM) analysis to determine delay and the ramifications of delay.  Instead of pages of tedious analysis development, this process shows direct delays to the Critical and Near-Critical Path including mid-period Critical Path shifts in the 4D model itself.  The process demonstration uses an actual project with real project data to analyze and determine delays.  This can be used in project analysis as well as forensic schedule analysis situations.

The authors have a strong depth of experience in Building Information Modeling (BIM), 4D modeling, and Virtual Design & Construction (VDC), having produced and used models for projects such as industrial plants, bridges, and buildings.  They combine this BIM/4D/VDC modeling and CPM scheduling background with forensic analysis expertise to produce a useful and meaningful technique.


Author(s)/Presenters(s): Ahmed Montaser, EVP; Ali Montaser, Peng CCP EVP PSP


The current economic conditions have necessitated the use of rational approaches, procedures and application of new methods by using advancements in the field of construction. Therefore, the use of Value Engineering (VE) in construction industry has grown significantly in view of its extensive benefits. This paper presents a model that integrates Building Information Modeling (BIM) and VE in construction projects to support project stakeholders. The model is developed to automate the process of data extraction and manipulation from BIM and processing the extracted data to evaluate competing alternatives. A vital stage in applying VE is the evaluation of alternatives through different assessment criteria by project team members, which places subjectivity in perspective. To reduce subjectivity in the developed model, Analytical Hierarchy Process (AHP) algorithm is used to support VE multi criteria decision making. The developed model makes full use of BIM capabilities that provide activities visualization and pertinent information of time and cost. The developed integration model was implemented in prototype software that is named Value+. It is a three-tier software, which utilizes an object-oriented BIM model. The developed model, methods, algorithms and software constitute a step ahead of current value engineering applications in construction industry. The model has been applied to an actual case study to demonstrate and verify its use and capabilities. The project is phase 2 of new Liquid Natural Gas (LNG) Support Campus with 1000 m2 land area. Nine evaluation criteria were selected to choose the optimum solution from three alternatives for slab structure system.

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