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A Guerriero, S Kubicki, L Schwartz

Design and assessment of prospective mobile services for construction

Abstract: Mobile applications become more and more used in both private and professional activities.Innovation through mobile services specification and prototyping becomes a major trend inconstruction sector research. The project presented in this paper aims both at demonstrating theinterest of mobile technologies for assisting building construction coordination and to elicitate themost interesting and common requirements of construction practitioners for this type of application.Then the paper focuses on the method used for specifying basic requirements and the experimentalprotocol setup for assessing the developed prototype. The main outputs are a set of specifications and aprototype of mobile application as well as a method for defining experimental protocols in a context ofservice-based innovation. The prospects envisage considering context-aware mechanisms for therecommendation of mobile services to construction practitioners.

Keywords: Construction management, Mobile computing, Mobile service prototyping, Experiment protocol.

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Series: w78:2011 (browse)
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A. Z. Sampaio, P. G. Henriques

Virtual reality technology applied in engineering education

Abstract: The three-dimensional geometric models used to present architectural and engineering work, show only the final form, which does not allow progress in constructions to be observed. But, the visual simulation of the construc-tion process of a building need mod-els which are able to produce dynamic changes to their geometry. This paper re-ports how techniques of geometric modelling and virtual reality were used to obtain models that could show their physical evolution over time and which would be able to simulate construction processes visually. Two types of work, concerning the construction of a cavity wall and a bridge, were developed as virtual models for educational purposes. These models make it possible to view the physical evolution of the work, to follow the planned construction sequence, to visualize details of the form of every component of each work and to support the study of the type and method of op-eration of the equip-ment necessary in the construction process. These models have been used to distinct advantage as educational aids in first-degree courses in Civil Engineering. The use of virtual reality techniques in the development of educational applications brings new perspectives to the teaching of subjects related to the field of construction.

Keywords: education, engineering, simulation, 4d models, virtual reality

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Series: w78:2007 (browse)
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Aalami F, Fischer M

Joint product and process model elaboration based on construction method models

Abstract: In practice, construction planners need to plan and replan projects at several levels of detail and would like create 4D visualizations to communicate construction schedules. The current construction planning and scheduling process is , however, still largely manual and time-consuming, making it difficult to maintain an appropriate and realistic set of plans, schedules, and 4D visualizations throughout design and construction. Researchers have demonstrated the usefulness of a product model with a decomposition hierarchy and supported-by relationships between project components to generate a construction process model automatically. The product model's decomposition hierarchy supports the generation of hierarchical activities, and the supported-by relationships between components enable automated reasoning. However, the resulting process model is typically not a usable or realistic construction schedule, since activities can only be sequenced if elaborated to the same level of detail, and component-based activity elaboration is limited to the original product model. This paper discusses how a customizable and general representation of construction method models supports the transformation of a design-centric product model into a production-centric view. A formalized hierarchical construction planning process forms the basis of this translation process. The planning process is broken down into method-driven elaboration and hierarchical planning and scheduling steps. User-defined and user-selected construction method models drive the elaboration process by supplying the necessary activity and component elaboration knowledge. The product model undergoes a transformation from a design-centric decomposition to a production-centric decomposition. The elaborated activities are sequenced based on constraints that are passed on to the activities from their construction methods. The output of the planning process is a 4D production model. A 4D production model is a linked representation of an elaborated product and process models. A 4D production model is a flexible representation of the construction process that can support many views for communication and evaluation, e.g., 4D visualization, CPM-network, barchart, or resource histograms.

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Full text: content.pdf (289,626 bytes) (available to registered users only)

Series: w78:1998 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.represent (0.035804) class.processing (0.027755) class.communication (0.018300)
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Permission to reproduce these papers has been graciously provided by Royal Institute of Technology, Stockholm, Sweden. The assistance of the editors, Prof. Bo-Christer Björk and Dr. Adina Jägbeck, is gratefully appreciated.


Ahmed Laaroussi, Bruno Fiès, Rémi Vankeisbelckt, Julien Hans

Ontology-aided FMEA for construction products

Abstract: The goal of improving the quality and the maintenance of building products, and the will to integrate the sustainable development objectives led us to propose an original method based on the use and adaptation of the Failure Modes Effects and Criticality Analysis (FMEA). This method relies among others on ontology use. It facilitates the FMEA proceeding. This paper aims to introduce innovative software specifically developed to perform more easily FMEA on building components. This software takes advantages of a structured knowledge base and an inference rule engine that allow a complete and formal description of the product to be analysed and an exhaustive analysis of all failures (degradations) that may occur.

Keywords: FMEA, ontological approach, knowledge capitalisation, degradation analysis, construction product

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Series: w78:2007 (browse)
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Aiyin Jiang, Bin Cheng, Ian Flood and Raymond Issa

Modified Linear Scheduling Method In Scheduling Multiple Utility Line Construction Project

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Series: w78:2006 (browse)
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Akinsola A, Dawood N, Hobbs B

Construction planning process improvement using information technology

Abstract: "Construction is a multi-organisation and interactive process. Successful completion of a project therefore depends on the accuracy, effectiveness and timing of communication and exchange of information and data between the supply chain. Unfortunately, the inefficiency of the existing method of communication has become a barrier to several innovative construction processes developed for the industry over the past four decades. Thus, research efforts and direction have since changed. Several studies now focusing on integration of the construction process with communication and standardisation of data exchange, taking advantage of evolving computer technologies. The capability of these technologies, object-oriented technology and the Internet has made a significant impact on other economic sector such as finance, manufacturing, insurance, etc., with significant improvement in performance and productivity. Thus the technology is available but the challenge is utilising the technology to develop method of improving the construction process. To ensure efficient utilisation of IT as enabling tools, formalisation and understanding of the construction processes are required. This will enable the identification of the problems and opportunities of the strategy, and its implementation and performance in practice. The paper presents a detailed model of pre-construction and construction planning processes, based on an on-going research project, that form the basis of the developed planning system. The detailed process mapping methodology using CASE tools and the associated integration of IT tools, as an enabler to aid and improve the planning process, are described. The system provides an interface for integration of CAD data, using IFC objects, within the system. The application of the system offers a promise of significant improvement in both pre-construction and construction processes."

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Full text: content.pdf (375,439 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.economic (0.028439) class.environment (0.027790) class.impact (0.027062)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Al-Tabtabai H, Alex A P, James R

Slab formwork design using genetic algorithm

Abstract: A method to design cost-optimum slab formwork components is proposed in this paper. Genetic Algorithms (GAs), a technique based on the principles of natural selection and evolution, is applied to solve the optimisation problem. GAs search from a population of possible solutions limited by a set of constraints. The cost of form components and labor involved, were considered for the formulation of the objective function of the optimisation problem. The bending moment, shear, maximum deflection, imposed ACI code provisions, etc., were used as constraints for the optimisation problem. Application of GA to the formwork design problem provides optimum design parameters such as the optimum cross section for form members, optimum spacing of form members, etc., while minimising the total cost. Formwork made either from wood, wood-metal composite or metal alone can be designed using the proposed technique. The paper presents the case of general formwork design, however, the method as a whole readily applies to the design of formwok for elevated slabs and high rise concrete elements.

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Full text: content.pdf (84,716 bytes) (available to registered users only)

Series: w78:1999 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.economic (0.011489) class.analysis (0.007703) class.retrieve (0.007266)
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Permission to reproduce these papers has been graciously provided by the Research Press of the National Research Council of Canada. The support of the editors, particularly Dr. Dana Vanier, is gratefully appreciated.


Alekhin V,Antipin A,Gorodilov S,Khramtsov S

Numerical simulation of wind loads on high rise buildings

Abstract: Article presents a methodology of the numerical simulation of the wind on high-rise buildings, which was developed by the Department of Computer-aided design of structures of the Ural Federal University named after the first President of Russia B.N. Yeltsin. Paper includes the results of researches on development of a technique of determination of wind pressure upon high-rise buildings by means of numerical modeling in an ANSYS package. The investigation was carried out within the grant of the Russian Academy of Architecture and Building Sciences. The results are applied to calculation of wind pressure upon a number of high-rise buildings under construction in Yekaterinburg City (Russia). Simulation is performed in the program ANSYS. The simulated building is placed in a domain that is the numerical analogue of wind tunnel. Domain sizes are chosen in such a way that simulated buildings do not affect the flow of air on its boundaries. Shear stress transport (SST) turbulence model has been used. This model effectively combines the stability and accuracy to the standard k-? model in the areas, which are placed near the walls and the effectiveness of the k-e model at a distance from the walls with a smooth transition between them (input expansion functions). For the numerical solution of the governing equations the finite volume method was used (FVM). The scale of the turbulence is assumed to be 200-300m. Use of the developed technique is shown on the example of calculation of wind pressure and wind velocities in pedestrian area for high-rise building under construction in the City of Ekaterinburg.

Keywords: high-rise building,wind impact,simulation,wind loads

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Series: convr:2013 (browse)
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Aleš Mrkela & Danijel Rebolj

Automated construction schedule creation using project information model

Abstract: In this paper we will propose a method of using a project information model (PIM) for creating construction schedules. In the paper we will briefly review current available scheduling possibilities, which use combination of BIM and scheduling software. We realized that BIM lacks user specific data that is vital for proper schedule creation and has, on the other hand, too complex structure and software tools for planning personnel to understand. Through the use of simple 3D model viewer, user specific data and BIM, we are proposing a novel approach of schedule estimation in construction, which we call project information model (PIM). PIM is the process that is based on internal logics, that creates the estimated schedule and resource usage. After the PIM process, the automatically created schedule is included in BIM and made available to project managers and other construction stakeholders, to coordinate and carry out activities.

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Full text: content.pdf (279,466 bytes) (available to registered users only)

Series: w78:2009 (browse)
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Alkass S, El-Moslmani K, AlHussein M

A computer model for selecting equipment for earthmoving operations using queuing theory

Abstract: This paper presents a computer model “FLSELECTOR” for equipment fleet selection for earthmoving operations. The methodology based on the queuing theory is incorporated in a computer module to account for the uncertainties in that are normally associated with the equipment selection process. FLSELECTOR is capable of assisting the users in making decisions required for earthmoving operations, such as determining the size and number of trucks and excavators, haul road lengths and surface conditions, etc…These decisions are based on the calculated output for all feasible fleets. An actual case study is presented in order to illustrate the effectiveness and performance of the FLSELECTOR in comparison with the simulation method

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Full text: content.pdf (237,842 bytes) (available to registered users only)

Series: w78:2003 (browse)
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Permission to reproduce these papers has been graciously provided by the University of Auckland. The assistance of the editor who provided the full texts and the structured metadata, Dr. Robert Amor, is gratefully appreciated.


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