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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.


Alshawi M, Underwood J

A process and an object oriented analysis to integrate design and construction

Abstract: This study is aimed at identifying design related problems encountered by contractors with the intention of minimising them. A full process analysis was carried out on the design function of concrete framed ofice buildings whereby site problems were traced back to the relevant design information. Design processes that significantly contribute to these problems were highlighted along with their data flows. An Object-Oriented Analysis method has then been applied to model the information in terms of the fundamental ideas that underlie object- oriented technology i.e. object types and classes, methods, requests, encapsulation and inheritance. Proceeding through the five major activities of Coad & Yourdon's OOA method, a complete OOA model has been developed with potential to improve the construction related problems.

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Full text: content.pdf (2,068,128 bytes) (available to registered users only)

Series: w78:1994 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.software development (0.047990) class.analysis (0.011928) class.store (0.004918)
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Permission to reproduce these papers has been graciously provided by VTT, Espoo, Finland.


B. Omar, S. Abu Hassan & T. Ballal

Exploring Context-Awareness in the construction logistics services delivery

Abstract: Managing a construction project supply chain effectively and efficiently is extremely difficult due to involvement of numerous sectors that are supported by ineffective communication system. An efficient construction supply chain system ensures the delivery of materials and other services to construction site while minimising costs and rewarding all sectors based on value added to the supply chain. The advancement of information, communication and wireless technologies is driving construction companies to deploy supply chain management strategies to seek better outputs. As part of the emerging wireless technologies, context-aware computing capability represents the next generation of ICT to the construction services. Conceptually, context-awareness could be integrated with Web Services in order to ensure the delivery of pertinent information to construction site and enhance construction supply chain collaboration. An initial study has indicated that this integrated system has the potential of serving and improving the construction services delivery through access to context-specific data, information and services on as-needed basis.

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Full text: content.pdf (192,550 bytes) (available to registered users only)

Series: w78:2009 (browse)
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Belevicius R, Valentinavicius S, Weener R J

Optimisation of grillage-type foundations

Abstract: The mathematical models for optimisation of grillage-type foundations are presented. Minimising ofmaximum in absolute value vertical reactive force, bending moment, and reaction-bending momenttogether is sought employing methods of finite elements, analytical sensitivity analysis, andmathematical programming. Present models and computer code are implemented in the softwareMatrixFrame. Solutions of a number of problems demonstrate the validity of proposed algorithms.

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Full text: content.pdf (233,114 bytes) (available to registered users only)

Series: ecce:2001 (browse)
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Bella Nguyen and Ioannis Brilakis

Minimising Misclassifications of Over-Height Vehicles Due to Wind

Abstract: Over-height vehicle strikes with low bridges and tunnels are an ongoing problem worldwide. While previous methods have used vision-based systems to address the over-height warning problem, such methods are sensitive to wind. In this paper, we propose a constraint-based approach to minimise the number of over-height vehicle misclassifications due to windy conditions. The dataset includes a total of 102 over-height vehicles recorded at frame rates of 25 and 30 fps. At this frame rate, we analysed sampling rates to determine the sufficient number of positive frames required to provide accurate warnings to drivers. Optical flow and KLT feature-tracker algorithm was used to detect and track feature points of motion. Motion captured within the region of interest was treated as a standard two-class binary linear classification problem with 1 indicating over-height vehicle presence and 0 indicating noise. The algorithm performed with 100% recall, 83.3% precision and false positive rate of 8.3%.

Keywords: Bridge Strike, Tunnel Strike, Over-Height Vehicle, Over-Height Vehicle Detection System, Bridge Strike Prevention

DOI: https://doi.org/10.24928/JC3-2017/0249

Full text: content.pdf (3,818,410 bytes) (available to registered users only)

Series: jc3:2017 (browse)
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Mallasi Z, Dawood N

A generic inclusion of space strategies with activity execution patterns in 4D tools

Abstract: In this paper we describe construction generic space strategies that affect the development of realistic 4D space visualisations. The simple and dynamic approach has been implemented in the PECASO model to allow a new insight into a project’s space-time schedules. Our approach considers the activities execution patterns among the variables used for minimising space-time conflicts between site operations. The semantics of a construction activity execution patterns are illustrated in this work and they are: 1) progress of work direction, 2) execution of work direction, and 3) activity volume of work per week. The PECASO system applies a Simple Genetic Algorithm (SGA) to search for the most suitable execution pattern suitable for a construction activity. Among the included space strategies are the physical constraint such as activity-products Assembly Sequence Constraints (ASC) and the construction logic dependencies. The SGA has been proposed here to model the generic space strategies for the execution patterns. This research suggests that the definition of activity execution patterns semantics in 4D is an important element of interaction between site operations and could shape the site space usage in a different way. Other advantages are the benefits that can be generated from rehearsing different ‘what-if’ scenarios for coordinating site operations and to communicate the project plan in 4D. The paper presents an experimental execution patterns SGA runs with results, and shows how they are used to minimize space-time conflicts.

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Full text: content.pdf (414,617 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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