D. Ye & T. Froese
A Unified Construction Project Management Arena
Abstract: To address the severe problem of information fragmentation in the construction industry, significant effort has gone into developing information interoperability techniques based on shared project data models. As a result, a wide range of software applications are able to exchange project information, resulting in significant efficiency and coordination improvements. Here, we extend this trend further, exploring the role of an information integrator system that allows users to work directly with the combined set of project information. An information integrator would work in conjunction with traditional applications, allowing users to create user-defined, multi-dimensional data views from the combined project data model, tailored to suit the needs of specific work tasks. In this way, users can maximize the benefit of the combined data model and enhance their ability to deal with the data interdependencies. This paper presents a technical framework for an information integrator for construction project management. It describes the requirements and technical solutions to achieve the necessary integration and flexibility at three layers of system architecture: the data layer, the application logic layer, and the presentation layer. Finally, it describes a prototype information integrator system called the Unified Construction Project Management Arena.
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Kassem M,Chavada R,Dawood N,Benghi C,Sanches R
Road construction projects: an integrated and interactive visual tool for planning earthwork operations
Abstract: Road construction projects are expensive and highly affected by uncertainties related to factors such as weather, type of soil and other site and environmental factors. These uncertainties impact on the accuracy of predicting resource productivity and developing reliable schedules for earthwork operations. Current simulation and planning approaches and tools not only lack the capabilities of dealing with such uncertainties but they also lack the integration and intelligence to simulate multiple strategies Ė a model should be built every time a new scenario is required. As a result, planning decisions regarding the assignment of resources are purely based on planners experience and project plans are not the outcomes of comparing various allocation strategies. This paper proposed an approach which is visual, interactive, and integrator of the functions involved in earthwork operation such as activity scheduling, resource productivity calculation, optimal distance calculation and profile visualization. This specifically addresses the challenges related to the limited intelligence and capability of simulating multiple strategies of resource allocation in earthwork operation. The proposed development builds upon a prior study (Castro and Dawood, 2005) that developed a knowledge-driven approach to tackle the Ďuncertaintyí challenge affecting the productivity of resources. This paper hypothesizes that an integrated approach which integrates the various functions involved in earthwork operations and provides an interactive environment where planners could easily change planning decisions and promptly analyze the effect of their decisions could improve the reliability of plans and consequently improve the performance of road construction projects.
Keywords: Earthwork operations,interactivity,resource planning,visualisation
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The cost estimating as the integrator between design and production
Abstract: Generally, the cost estimating is the first process where the design information meet the
production information. It is very important that this integration succeeds; otherwise the same
procedures are carried out several times while wasting resources. If the cost estimating
processes and tools are well designed, the production planning, the procurement, the
purchasing and the management tasks can both utilise and enrich the information produced
on the design and the cost estimating phases. The focus of this paper is on the conceptual
models of cost estimating tools and it is based on the research work and experiences collected
during the last decade in Finland.
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Cluster: papers of the same cluster (result of machine made clusters)
Class: class.economic (0.025205)
Sound: read aloud.
Permission to reproduce these papers has been graciously provided by Royal Institute of Technology, Stockholm, Sweden. The assistance of the editors, Prof. Bo-Christer BjŲrk and Dr. Adina Jšgbeck, is gratefully appreciated.
Yang Ji, Andre Borrmann, Johannes Wimmer, Willibald A. Gunthner
Bidirectional Coupling of Macroscopic Optimization and Microscopic Simulation Of Earthwork Processes
Abstract: In the research project ‚ÄúForBAU ‚Äď The Virtual Construction Site‚ÄĚ [Bormann et al. 2009], an integrated 3D model-based framework for simulating earthwork processes has been developed. This simulation framework consists of two major parts: an earthwork modeling and assessment tool ForBAU Integrator which integrates road, subsoil and terrain model in a holistic model and provides high-accurate quantity takeoffs of the earth movement as simulation source data [Ji et al. 2009]; The second important part is a discrete event-based simulation tool used to model and simulate earthwork processes in detail [Wimmer et al. 2010]. Both tools communicate via an XML interface. In addition of generating quantitative simulation source data, the ForBAU Integrator has been extended by the ability to model earthwork optimization problems using bipartite graphs and to solve these problems with linear programming techniques [Ji et al. 2010]. One of these problems is the Earthwork Allocation Problem (EAP). Here, the optimization objective is determining the optimal assignments of cut to fill areas such that minimal transportation costs incur. Beyond these research results, this paper presents a bidirectional coupling concept between microscopic simulation and macroscopic earthwork optimization. The aim of this approach is iteratively increasing the accuracy of the simulation results in the entire framework. On the one hand, the exactly optimized cut-to-fill assignments are subjected to the mathematical equations which describe upper and lower capacity limitation of respective cut or fill areas as well as the efficient distance between them. This optimization result implies the most effective way for the earth movement from a global point of view, regardless of any resource restrictions. On the other hand, the resource assignments and processing details are modeled on the simulation platform. The actual transportation time of the cut-to-fill earth movement (excavation, load, transportation, compaction, etc.) can be closely estimated in the simulation environment. The key issue behind this concept is to define an iterative parameter exchange between the two different subsystems. Obviously, two possible coupling-parameters can be applied in this case: the cut-to-fill assignments and the corresponding processing time. The iteration starts by initializing the cost function with an average processing time. The optimizer calculates based on this trivial cost function the optimal cut-to-fill assignments as input data for the simulator. After the simulation is finished, the simulated processing times will be re-imported for updating the cost function in the optimizer. The iteration process should end with a converging processing time of earthwork movements. This concept is already implemented and will soon be evaluated by means of a federal high-way construction project in Germany.REFERENCESA. Borrmann, Y. Ji, I-C. Wu, M. Obergrie√üer, E. Rank, C. Klaubert, W. G√ľnthner: ForBAU - The Virtual Construction Site Project. In: Proc. of the 26th CIB-W78 Conference on Managing IT in Construction. Istanbul, Turkey, October 2009. Y. Ji, A. Borrmann, E. Rank, J. Wimmer, W. G√ľnthner: An Integrated 3D Simulation Framework for Earthwork Processes. In: Proc. of the 26th CIB-W78 Conference on Managing IT in Construction. Istanbul, Turkey, October 2009. J. Wimmer, Y. Ji, T. Horenburg, A. Borrmann, W. G√ľnthner, E. Rank: Evaluation of the 3D Model-based Earthwork Process Simulation in Practice. In: Proc. of the 14th ASIM-Conference Simulation in Production and Logistic (ASIM2010), Karlsruhe, Germany, October 2010, (to appear).Y. Ji, F. Seipp, A. Borrmann, S. Ruzika, E. Rank: Mathematical Modeling of Earthwork Optimization Problems. In: Proc. of the International Conference on Computing in Civil and Building Engineering 2010 (ICCCBE 2010), Nottingham, UK, Juli 2010.
Keywords: bidirectional coupling, earthwork, optimization, simulation, road construction
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