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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.


Alan Hore, Barry McAuley and Roger West

BIM Innovation Capability Programme of Ireland

Abstract: The Irish Government has requested that Enterprise Ireland, an organisation responsible for the development and growth of Irish enterprises in world markets to actively promote the use of BIM in Ireland. This promotion has taken the form of an opportunity for Enterprise Ireland clients to apply for a grant under their BIM Enable and BIM Implementation schemes and also through their funding of the BIM Innovation Capability Programme (BICP) of Ireland. The BICP is a two-year project (2016-2018) which seeks to capture the capability of the Irish Construction Industry and the Higher Education Institutes to respond to the increased requirement for BIM in Ireland. One of the primary responsibilities of the BICP research team is to collate data to assist the Irish National BIM Council (NBC) in the formulation of a National BIM Roadmap. To achieve this a global and local BIM study was undertaken in 2016. This involved extensive desk-top based research exploring the value proposition behind what governments and professional bodies are doing to advance BIM in their respective countries. The research identified a number of common themes or pillars that Ireland will need to further address before a roadmap is formally disseminated. After exploration of these pillars, within an Irish context, it was found that despite a lack of standards and contractual frameworks, it has not prevented the industry from deploying BIM on Irish projects

Keywords: BIM, Irish Roadmap, Public Works, BIM Innovation Capability Programme

DOI: https://doi.org/10.24928/JC3-2017/0079

Full text: content.pdf (428,704 bytes) (available to registered users only)

Series: jc3:2017 (browse)
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Bouchlaghem D, Rezgui Y, Hassanen M, Cooper G, Rose D

IT tools and support for improved briefing

Abstract: "The briefing stage is critical to the success of construction projects, however it is widely recognised that improvements are needed in this process in order to reduce the cost and optimise quality of buildings. Briefing involves understanding the client's needs and expressing them in a way that will ensure compatibility between the client's vision of the project and the resulting product. There are problems encountered in construction briefing which involve both clients and designers. There is little guidance and support for clients, whilst designers have difficulties both in capturing clients’ needs and conveying conceptual design options to them. There is a central difficulty, associated with language, communication and the exchange of information between clients and design teams, which is now gaining widespread acknowledgement. The CoBrITe (LINK/IDAC UK funded) project argues that the construction industry has yet to exploit the potential of IT systems to assist both parties during this critical phase. This is in contrast to later stages of design and construction where computer-based techniques and systems are commonplace. The overall aim of the CoBrITe project is to improve the briefing process through more efficient and effective use of existing and emerging information technologies that can support client and design teams. The project builds on the recent IDAC 88 project: Managing the Brief as a Process of Innovation, and its five key action areas for improvement: empowering the client, managing the project dynamics, appropriate team building, appropriate visualisation techniques, and appropriate user involvement. It is driven by the needs of solving challenges within the briefing and related design process, with IT a means to an end. The project brings together a group of companies from across the construction supply chain to work together towards the above aim. The methodology comprises: -An extensive literature review on construction briefing focusing on the process of briefing, human and cultural issues, and IT applications and their role within the process. ·The integration of the recent and current projects on briefing through interviews, establishing an electronic network and holding workshops. ·The formulation of a framework of enabling technologies and their potential role in facilitating the briefing process and overcoming human and organisational constraints. ·The development of a model which will facilitate the integration of activities and information sharing in the briefing process. The proposed paper will give a comprehensive overview of the CoBrITe project, including an analysis of the briefing practices and information requirement, an initial CoBrITe Briefing Process Model, the CoBrITe system architecture, and the description of the proposed framework that integrates a set of proprietary and commercial software applications aimed at supporting the briefing process."

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Full text: content.pdf (319,634 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.roadmaps (0.015409) class.processing (0.014768) class.economic (0.012134)
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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


Christiansson P

Properties of future building hyper documents

Abstract: The paper describes and exemplifies how modem information technology may impact the properties of future computerized building documents and models. It is now possible to practically handle large quantities of data in the form of color pictures, film, sound recordings, animation sequences, drawings etc. The systems we formulate today are better suited to capture information putting higher pressure on the users concerning formulation of demands on user interface, model descriptions and model building tools. A group of projects under the label KE3S-MEDIA, knowledgebased systems - media, are aiming at integrating advanced software (knowledgebased systems, Hyper Card from Apple computer. etc) with new distribution and storage media. The hyper documents which are created possess powerful man-machine interface and dynamic model building properties. The system forms a demonstrator environment used in different applications to capture, test and communicate ideas and admitting fast prototyping. New tools are defined, developed and tested. Tools which support conceptual modeling activities, use and building of hyper documents in a multimedia environment. The following building applications are at the moment included in the research: The City Advisor, Window Renovation Advisor, Advanced Information Technology in Building Maintenance Support (the Delphi project) and Advanced Material and Vendor Information, (the AMVI project)

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Full text: content.pdf (2,550,602 bytes) (available to registered users only)

Series: w78:1988 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.man-software (0.072996) class.environment (0.037882) class.synthesis (0.024467)
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Permission to reproduce these documents has been graciously provided by the Lund University and the Swedish Building Centre. The assistance of the editors, Prof. Per Christiansson and Prof. Henry Karlsson, is gratefully appreciated.


Christiansson P

Next generation knowledge management systems for the construction industry

Abstract: We have for a few decades been changing paradigm with regard to information handling. The traditional paper based information storage and presentation medium is substituted and complemented with digital storage accessible for reading and updating at optional time and place. Digital models of our reality and also non-physical objects are accessed from adapted and advanced user environments (UE). The paper explains potentials of new advanced ICT and discusses how these tools will support and influence the building process models and its organisation. Recommendations are given on how we can handle and meaningfully contribute to the ongoing change process. Important advances in ICT tools development such as semantic web and temporal databases are explained and related to increased quality and change of the building process. It is stated that ICT must not be regarded as one of these tools that we only have to learn to use but as an integral part of the company and project knowledge management system. The formulation and refinement of digital models of the building process must be driven by the end users preferably in collaboration between industry and university.

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Full text: content.pdf (813,893 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.


Daum S,Borrmann A

Checking spatio-semantic consistency of building information models by means of a query language

Abstract: One of the characteristic features of object-based Building Information Models is the close integration of geometric and semantic information into one model. This concept is thoroughly implemented by the Industry Foundation Classes (IFC), a comprehensive data model designed to provide a sound foundation for complex data exchange scenarios. Besides the provision of a large variety of data types for capturing the semantics of building elements and spaces, the IFC also makes it possible to define relationships between building elements and/or spaces, respectively. In particular, a spatial aggregation hierarchy can be modeled by successively applying the relationship IfcRelAggregates to space objects. However, no validation options currently exist to check whether the semantically defined aggregation hierarchy complies with the geometric setup of the individual spaces and building elements. This lack of consistency between the semantic and the geometric part of the BIM model may lead to serious data interpretation errors at the receiving end. To prevent this, we propose a new method for validating spatio-semantic consistency based on the usage of the Query Language for Building Information Models (QL4BIM) which on the one hand provides a means of accessing the IFC object model and on the other hand provides high-level spatial operators, such as Disjoint, Touching and Containing. The formulation of corresponding queries makes it possible to verify the spatio-semantic consistency of the IFC model. The paper discusses application scenarios and provides a number of relevant examples.

Keywords: BIM,IFC,Topology,Validation,Consistency,Spatial Relationships

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Full text: content.pdf (718,919 bytes) (available to registered users only)

Series: convr:2013 (browse)
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Dimitra Chondrogianni, Christos Gioldasis and Yorgos Stephanedes

Low-Cost Fleet Management Solutions in the Framework of Emerging Markets

Abstract: Implementation of ITS solutions in the emerging market of Egypt is at an early stage, yet has made significant progress. In the framework of PHAROS project, low-cost smart solutions have been developed for fleet managers to facilitate efficient route choices and eco-driving that minimize fuel consumption and carbon emissions. These solutions were integrated in an existing fleet management system. This paper presents the theoretical and practical formulation of the rescheduling component added to the already existing fleet management system. The rescheduling component is based on the development of an eco-path that considers the "cost" between two consecutive nodes. By the term "cost", more parameters such as path length, travel time, operating costs, energy consumption required for each route, are taken into account. Based on the above decision-routing parameters, through the use of a routing algorithm, the optimal path between the origin and the destination node is proposed.

Keywords: ITS, Fleet Management, Rescheduling, Emerging Markets

DOI: https://doi.org/10.24928/JC3-2017/0180

Full text: content.pdf (2,880,083 bytes) (available to registered users only)

Series: jc3:2017 (browse)
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Koutamanis A

AZILE: an intelligent verbal interface for the retrieval of pictorial architectural information

Abstract: The proliferation of on-line image databases and the utility of these images have triggered the development of content-based techniques for indexing and retrieval. Most techniques are characterized by a verbal interpretation of visual patterns for query formulation. The paper describes the integration of such verbal terms for architectural pictorial information in AZILE, a natural language interface that operates through a dialogue with the user. In this dialogue the user expresses queries as normal everyday utterances. These are parsed and matched to a thesaurus of architectural terms and concepts. The meaning and associations of these terms result into a preliminary fuzzy classification of available pictorial information. The purpose of AZILE is three-fold. Firstly, it serves as an incremental refinement of the query. Secondly, it facilitates direct retrieval of suitable information in a browsing fashion. Thirdly, it supports machine learning by automatically indexing of the images with the terms identified in the user's utterances.

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Full text: content.pdf (187,384 bytes) (available to registered users only)

Series: w78:2002 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.retrieve (0.057849) class.man-software (0.027811) class.deployment (0.019690)
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.


Kumaraswamy M M K, Palaneeswaran E, Ng S T

Towards ICT-enhanced management support systems for optimizing infrastructure procurement

Abstract: Infrastructure procurement programmes of many public clients and large private developers, increasingly involve complex networks of stakeholders. Well balanced and 'fully informed? decisions are critical in optimizing resources to achieve agreed objectives. A research project in Hong Kong is aimed at developing an ICT (Information and Communications Technology) - enhanced MSS (Management Support System). This will empower the formulation of more effective and efficient construction project procurement and delivery/ operational systems - for innovative and improved 'total? management of construction projects - from a large client's viewpoint. Web-based Decision Support Systems (wDSSs) are being developed to help achieve such objectives, by capturing, codifying and mobilising both expert and experiential construction industry knowledge. Furthermore, web interfaces are being designed to mobilise the collective expertise of the entire project supply chain in real-time collaborative formats. These decision aids will enable the often fragmented multi-disciplinary project teams to build on 'state of the science? knowledge, past 'lessons learnt? and present best practices, in making more informed managerial decisions that will help to optimise inputs and reduce wasted resources. Potential benefits of wDSSs are demonstrated in this paper, through examples from the integrated framework and prototype modules/ models that are under development and 'construction' in Hong Kong. These cover a crosssection of infrastructure programme management decision scenarios, i.e. in: (1) multi-purpose contractor registration-prequalification, (2) dynamic performance appraisal of contractors and (3) evaluating 'extension of time? entitlements. Interim outcomes included herein are the basic MSS framework, pilot models of items (1) and (2) above and prototype modules of item (3) above.

Keywords: construction, decisions, infrastructure, Management Support System, procurement

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Series: itaec:2004 (browse)
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Luis Fernando Alarcón, Claudio Mourgues, Cesar O’Ryan, Martin Fischer

Designing a Benchmarking Platform to Select VDC/BIM Implementation Strategies

Abstract: Recent VDC/BIM use surveys in the AEC industry and studies on implementation cases and models have provided insight into the adoption patterns of VDC/BIM methods. They have also shown the need for more systematic tools to identify the best implementation strategies that lead to improved performance at project and company levels. At the same time, the growing number of companies and projects implementing VDC/BIM presents an interesting benchmarking opportunity.This study is an initial step in the formulation of a benchmarking methodology to support AEC companies in the selection of VDC/BIM implementation strategies. Using empirical information obtained from surveys, the methodology will assess how and how much VDC/BIM implementation strategies impact processes and results of companies and projects. We explored three mathematical methods to understand and communicate the relation between strategies, processes and outcomes: Data Envelopment Analysis, Factor Analysis and Structural Equation Modeling. The first method describes the efficiency of various implementation strategies to produce certain impacts on processes and outcomes. The factor analysis methodology reduces the strategy information into unobservable variables (factors) that are used in the last method to describe and quantify the impacts of each of the implementation factors. This paper describes the potential of these three mathematical methods and describes the general design of the benchmarking platform.

Keywords: VDC, BIM, Implementation Strategies, Benchmarking

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Full text: content.pdf (662,064 bytes) (available to registered users only)

Series: w78:2010 (browse)
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