Welcome
Digital library of construction informatics
and information technology in civil engineering and construction
 

Works 

Search Results

Facilitated by the SciX project

Hits 1 to 10 of 22

A Magdic & D Rebolj

Human oriented mobile system for on-site problem solving

Abstract: Uncertainties and the dynamic nature of on-site activities require complex coordination of information, resources and tasks. Problems caused by unanticipated events must be solved concurrently and should avoid project delays and costs increasing. For effective solving of such problems, the immediate availability of information and a prompt response of project participants on various levels of project organization are crucial. A combination of both conditions facilitate the optimum decision-making in cases of unanticipated events. Based on experiences from a series of experimental projects called E-site, it is our strong belief that a large amount of potentials for on-site problem solving lies in the knowledge, experience and capability of the site staff themself. Therefore, there is also a need to effectively link together the rich knowledge and experience of site staff and include site staff into problem solving processes. This paper describes a human oriented on-site problem solving system supported with context-aware communication to help dealing with unanticipated events on construction sites.

Keywords:

DOI:

Full text: content.pdf (229,036 bytes) (available to registered users only)

Series: w78:2005 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.

Permission to reproduce these papers has been graciously provided by the Technische Universität Dresden.


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.

Keywords:

DOI:

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)
Similar papers:
Sound: read aloud.

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,Khanina A

The conception of making decision support system introduction into building structures design practice

Abstract: The paper discusses introduction of artificial intelligence into structural engineering practice. The necessity of this paper is accelerated by the information base (IB) and decision support systems exigency, as some standards are not completely designed and there is no statistical information on faults, defects and damage to various buildings. The article suggests creating a decision support system for the optimal structural design of buildings that takes into account a risk of a propagating rupture. The article describes possibilities of a decision support system, the stages of its development and structure. Conceptual solution of the proposed decision support system for the analysis of structures is illustrated by designing trade and business centre high-rise building. The system is based on a knowledge base, which is created during its development and can be updated and expanded with the advent of new codes of practice and new structural design recommendations. Expert system will be built on the basis of clear rules and recommendations from foreign and Russian codes of practice, as well as European standards, and international occurrences of buildings accidents. Optimization of structural elements is performed on the basis of a genetic algorithm. The effect of various genetic operators on the performance of the algorithm is investigated. A model of a genetic algorithm for optimization of steel structural elements is developed. The work is the attempt to create a complex approach to the structural design: the user can not only study the normative documentation, get advice, study the examples of calculation, but also take advantage of the proposed programs for the optimization of the design decisions. It is expected that expert’s knowledge on the analysis of buildings incorporated in expert system will improve the quality of the design, and as a consequence, the reliability of structures.

Keywords: decision support systems,expert systems,optimum design,propagating rupture,genetic algorithm

DOI:

Full text: content.pdf (1,730,377 bytes) (available to registered users only)

Series: convr:2013 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Brauns J, Rocens K

Multi-parameter optimization in the design of lining steel shell

Abstract: The thermobuckling problems of inner lining steel shell of thermobattery are solved. By using linear theory of cylindrical shells in case of thermal action only, a critical temperature interval is determined depending on shell geometry and stiffness of basic structure. On the basis of multi- objective optimization design methods for optimum weight and fastening of shell to basic structure are derived.

Keywords:

DOI:

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

Series: ecce:1997 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Choi, C-K. and Lee, H-W.

Three-Dimensional Analysis and Optimum Design of Building Structures

Abstract:

Keywords:

DOI:

Full text: content.pdf (952,793 bytes) (available to registered users only)

Series: w78:1986 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Hazlehurst G, Pitt T, Buxton R

Implementation of single building modelling technologies into themanagement phase of the property cycle

Abstract: This paper brings together work carried out by Guy Hazlehurst, Stephen Drewer and RodenBuxton at the University of the West of England on the concept of the Single Building Model andresearch by Terry Pitt and George Griffith on the management of complex healthcare facilities,'Healthcare FM'. The central aim of the research has been to utilise advanced 3D, object modelsof complex buildings not only as repositories for 3D, 2D graphics, data and intelligence, but to actas 'information brokers'. The concept of the single building model has effectively evolved toprovide a spatial database that has the inherent potential to act as the spine of a 'heterogeneous'system. This spine links the sub-systems that enable complex processes throughout the life of thebuilding to be modelled.This paper will seek to address the issues of systems integration, through the creation andapplication of Single Building Modelling technologies, during the post occupancy stage of thebuilding process. Modelling complex buildings and estates at a time long after the facilities wereoriginally conceived, designed and built posits a set of unique issues that do not arguably arisewhen such models evolve through the incremental processes of inception, design and construction.It will be argued that the principal issues are those of data compatibility and the level of detailrequired within the 'ex-post' single building model to deliver optimum benefit to the owners andmanagers of complex buildings. The research issues identified by the production andimplementation of such a model within a Hospital's existing building management will bediscussed. Although the example cited in this paper is a healthcare building the points raisedwithin it arguably apply to any significant property or estate.

Keywords:

DOI:

Full text: content.pdf (155,600 bytes) (available to registered users only)

Series: w78:1997 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Hemanta DOLOI & Xiao-Hua JIN

MODELLING MULTI-CRITERIA DECISION ANALYSIS FOR BENCHMARKING MANAGEMENT PRACTICES IN PROJECT MANAGEMENT

Abstract: The link between management practices and worker’s motivations impacting construction productivity is being considered as significant among the research community. This research aimed to identify and analyse the underlying attributes impacting construction productivity from the site management perspective. This research presents a framework designed to analyse and quantify the relative relevance of different drivers in the determination of productivity levels and the degree of effectiveness of potential opportunities for improving performance of overall projects. Owing to the complexity of construction projects and underlying conflicting drivers influencing higher worker’s productivity, the Analytical Hierarchy Process (AHP) is employed to deal with interdependent relationships within a multi-criteria decision-making model. In the analytical approach, the large unstructured decision parameters are identified first and then are broken down into the manageable and measurable components using a top down hierarchical structure. This paper demonstrates an example to illustrate how to empirically analyse and prioritise a set of influencing parameters as selection criteria in devising appropriate management practices to ensure higher productivity vis-a_-vis optimum performance of projects.

Keywords: Management practices, workers productivity, AHP, construction

DOI:

Full text: content.pdf (190,071 bytes) (available to registered users only)

Series: w78:2008 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Howard R, Resen J

Time factors in realising IT benefits in construction

Abstract: "IT context The concern over computer systems at the beginning of 2000 should have settled down by the time this paper is written, but it is symptomatic of an underlying, and recent, public concern that computers are not infallible. This has resulted in growing interest in measuring and predicting the benefits information technology can bring to business. The 'Productivity Paradox' contrasts the readiness with which companies buy individual IT systems with the absence of any proof that IT increases the productivity of whole industries. Paul Teicholz has recently shown that the construction industry in the US is not only falling behind other industries but that its productivity has declined in the last 30 years. Similar data can be presented for Denmark and the UK. Objectives This paper relates the evaluation of benefits of IT systems in construction to the time over which they are developed or implemented, and links this with the cyclic levels of activity from which all construction industries suffer. This leads on to suggestions about when IT systems of different types should be initiated in companies, in order to achieve full productivity at the stage of the cycle of activity when it is most critical. Methodology Ongoing work on how IT productivity is measured is combined with statistics on construction industry workload cycles in Denmark, The UK and the US. These show the variations between these countries and the paper suggests the optimum cycles on which different types of system should be replaced. Ths work is based upon surveys of how companies in construction measure IT benefits and government statistics. Conclusions The different time scales, ranging from development of customised systems to the introduction of off-the-shelf packages, have a major effect on evaluating benefits based on a changing workload. Little numerical evaluation is carried out at present because there are many different methods and reliable data required for these can be difficult to obtain. Major systems may need to be initiated at the peak of a cycle in order to be fully ready for the next peak, assuming that staff will be retained and training can be carried out during the intervening drop in workload. Work is in progress to develop a better method of evaluating benefits and will take these time factors into account"

Keywords:

DOI:

Full text: content.pdf (330,052 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.strategies (0.014425) class.impact (0.009302) class.commerce (0.009120)
Similar papers:
Sound: read aloud.

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


I Aydogdu, A Akin

Teaching and Learning-Based Optimization Algorithm for Optimum Design of Steel Buildings

Abstract:

Keywords:

DOI:

Full text: content.pdf (250,273 bytes) (available to registered users only)

Series: w78:2014 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


Ipek Gursel, Rudi Stouffs, Sevil Sariyildiz

A computational framework for integration of performance information during the building lifecycle

Abstract: Optimal indoor environments in terms of thermal comfort and indoor air quality are essential to maintain healthy and productive spaces. To address the high occupant comfort and energy efficiency requirements, advanced HVAC systems that have narrow performance boundaries are used. It is crucial to achieve the satisfactory operational level for systems and buildings by the adoption of performance based verification strategies. Performance-based approach requires the continuous verification of the actual performance against objectives during the building lifecycle. Building commissioning, building energy management systems (BEMS) and operations and main-tenance are effective tools to verify optimum building performance and have the potential to embed performance as-sessment into the building lifecycle. However, transfer of performance information from one method or building phase to another is difficult. A considerable amount of valuable information is lost due to the lack of an integrated framework that bridges different islands of information. This becomes most problematic during the operational phase, where de-sign data and performance trends are the main basis for decision making for facilities management staff. To achieve a persistent performance evaluation across phases and stakeholders, a flexible and seamless communication infrastruc-ture across disciplines and processes is necessary. The software architecture for a continuous performance verification and communication environment for indoor cli-mate and ventilation systems is introduced. The purpose of the model is to provide a framework that integrates commis-sioning, BEMS monitoring and inspection/maintenance activities, to avoid erosion of domain information during hand-overs and over time. The model retains continual information of building and makes this information available during building operations and [re]commissioning. A formal relationship structure is proposed between performance indices to support traceability of design and operations decisions. The paper will be concluded with reflections into the future work, which includes implementation and proposed strategies for validation of the model by test cases.

Keywords: building lifecycle performance assessment, building commissioning, BEMS

DOI:

Full text: content.pdf (741,211 bytes) (available to registered users only)

Series: w78:2007 (browse)
Cluster:
Class:
Similar papers:
Sound: N/A.


For more results click below:

 

hosted by University of Ljubljana



includes

W78




© itc.scix.net 2003
this is page 1 show page 2 show page 3 Home page of this database login Powered by SciX Open Publishing Services 1.002 February 16, 2003