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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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Andrej Tibaut, Branko Kau?i?, Peter Podbreznik, Marjan Lep, Dušan Zalar

Towards intelligent information system for public interurban road passenger transport management

Abstract: Public road transport forms a complex and dynamical domain that encompasses fields of traffic, business and politics. Management of the system poses a challenge for governmental entities which are responsible for coordi-nation, control and data gathering from private transport companies. A need for IT support is obvious. The paper systematically describes a distributed enterprise information system named AVRIS developed for the Direc-torate of the Republic of Slovenia for Roads. AVRIS adds new value to the management and coordination of the domain for public interurban bus transport. First a theoretical work flow model, consisting of processes, phases and states is defined. Built upon the model a multi-tiered IS architecture is developed which incorporates a number of advanced IT concepts, like application server, shared communication space, MVC, etc. The concepts are implemented using latest open source Java technologies. First real experiences with AVRIS are evaluated and presented in the paper.

Keywords: traffic engineering, public passenger transport management, traffic informatics, decision support, shared space, work flow, open source, Java

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Full text: content.pdf (781,550 bytes) (available to registered users only)

Series: w78:2007 (browse)
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Bloomfield D P

The role of case studies in the uptake of innovation in construction

Abstract: The UK Department of the Environment, Transport and the Regions has initiated a Construction Best Practice programme. The primary objective is to improve management best practices. The technical performance of the industry also needs to be improved by identifying and promoting opportunities for industry to adopt new technical innovations and incorporate them into standard practices. Accordingly, a series of Technical Best Practice initiatives will be set up. One of these will cover Construction IT. It is expected that Case Study material will form an important element of the IT Best Practice programme. Concrete examples of use of technology in practice are likely to be more convincing than simple exhortations and theoretical reports. There are three major issues that need to be addressed. 1. A Case Study is, by its nature, very specific and it can be difficult for the reader to ascertain if there is sufficient commonality between the problem described and the situation that he/she faces in order to assess whether the solutions are applicable. 2. It is difficult to describe the problem and solutions in sufficient detail, yet in a way that encourages the material to be read, understood and used. Ideally a common format needs to be developed for describing the key facts. 3. A further aspect of importance is how to determine what applications are most in need of Case Studies. Limited resources are available and it is essential that these are targeted in such a way as to produce maximum returns for the industry as a whole. This paper describes a framework for addressing these three issues and will provide an update of the work of the UK Construction IT Technical Best Practice programme.

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Full text: content.pdf (48,114 bytes) (available to registered users only)

Series: w78:1998 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.environment (0.009079) class.social (0.005934) class.legal (0.002856)
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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.


Danijel Rebolj, Riko Šafarič, Andrej Šorgo and Nenad Čuš Babič

SMARTCON, Self-Maintaining and Rejuvenating Constructions

Abstract: Infrastructure systems are established and maintained to satisfy our societal needs for living and transport. The European Roadmap for Cross-Modal Transport Infrastructure Innovation states that by 2030 an improvement of 50% in infrastructure performance, risk and cost versus a 2010 baseline should be achieved. However, current maintenance methods require intense engagement of highly trained experts and exposure to hazards, they are time consuming and hinder the normal use of constructions. Since infrastructure systems are not able to "care for themselves" they create a heavy burden for society in terms of regular maintenance and total cost of ownership. Therefore, SMARTCON proposes to transform passive constructions into smart structures able to take care of themselves. The envisaged system shall consist of a biomimetic swarm of robots able to perform continuous inspection, analysis of inspected indicators, decision support systems to advise on necessary maintenance or rejuvenation actions and to evaluate implemented actions. The paper is presenting the SMARTCON concept, the preliminary research, and the intended results of a three-year project beginning in early 2017. The project is focusing on bridges as they are considered to be among the most critical infrastructure objects.

Keywords: Automation, Infrastructure, Bridges, Inspection, Maintenance, Rejuvenation, Robot Swarm, Biomimetics

DOI: https://doi.org/10.24928/JC3-2017/0164

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Durmisevic S, Ciftcioglu O, Sariyildiz S

An application of neural network in post-occupancy evaluation of underground stations

Abstract: "The architectural and construction design deals very often with the word quality. This term is so vague and broad that the main difficulty arises if one needs to determine its aspects. It is rather simple to deal with the quantifiable building standards. The problem is how to demystify and thereafter integrate this fuzzy concept of quality into design. As an example we will use underground stations as a design problem area for two reasons. First of all, these spaces are rather young structures that have a high potential in the future. The efficiency of underground transport and importance of multiple space usage in the densely built urban areas are only some benefits that these spaces can offer. But yet many realized underground projects were not satisfactory to the users. Second reason lies in a fact that these spaces have their own limitations. Some qualities that are so obvious for the aboveground buildings, such as daylight or view, are rather difficult to obtain in underground spaces. Therefore, in these spaces the word quality is even more sensitive. But the literature that the architects can consult regarding these problems is rather scattered and difficult to obtain. One of the reasons is a lack of detailed documentation on actual applications of the theories followed by the research results and applied techniques. In this paper we used the AI technique, a Neural Network, for data analysis. The main objective of this paper is to develop a Support Model that will enable quality measurement of underground spaces in a systematic way. In order to avoid the ad-hoc design solutions for underground spaces, there is a need for systematic approach to their design. In such way the intuitive approach to problem solving can be minimized. This paper deals with following topics: 1. aspects that determine the quality of space 2. classification of psychological and spatial aspects 3. development of conceptual framework 4. application of Neural Network for post-occupancy evaluation 5. results and endeavor design guidelines First three topics will deal with criteria definition, which were necessary for design of the experimental part of a research. The experimental research, which was carried out at the site of one underground station, provided the necessary data. The main emphasis of the paper will be on Neural Network application (topic 4), which will be used to treat the data gathered on underground station. The main objective is to verify the consistency of the outcomes against the predefined criteria."

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Full text: content.pdf (1,096,055 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.050429) class.impact (0.013741) class.social (0.008794)
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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


Ito Y,Soulier C,Pencreach Y,Hafferty B,Hafferty P

The application of cloud computing in transport planning using interactive 3D VR simulation technology

Abstract: The design and planning of urban and transport infrastructure has undergone a tremendous transformation over the past few years. Not only has the available software technology changed considerably, so have the requirements and demands of the various stakeholders. As the democratic process becomes even more open, coupled with the advent of 24/7 information and news, so the demands of the general public to have a greater say in the actions that have a direct effect on their lives have increased. Local and National Government planning professionals are under increasing pressure to not only justify what they plan to do in words and pictures, but also to show the proposed new developments in a medium that is far more easily understandable to the ordinary ‘man in the street’. In the recent past the only way to do this was by calling ‘town hall meetings’ and displaying large photographs, video clips or solid models. This paper describes a new and novel way to improve consensus building for contentious new infrastructure projects, by using Interactive 3D Visual Simulation computer models, delivered to the target stakeholder community via the Cloud.

Keywords: 3D,Visualization,VR,Cloud Computing,Urban Planning,3D City Modeling

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Full text: content.pdf (689,297 bytes) (available to registered users only)

Series: convr:2013 (browse)
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Koivu T J

Future of Product Modeling and Knowledge sharing in the FM/AEC industry

Abstract: This paper describes a technology foresight study performed in co-operation with Stanford University (CIFE) and VTT Building and Transport. The main aim of the project is to provide information for decision-makers about the future of interoperability and product modeling. Information was collected about technologies and their use, conditions affecting the use of the technologies and development trends. The project had two main phases: state-of-the-art and scenario building. Different methods were used for collecting data for the state-of-the-art phase. A two-round Delphi survey complemented interviews and literary study. Scenario planning and technology roadmapping were used to formulate alternative pictures of how product modeling and use of interoperable software might affect the industry. The scenarios are based on two main forces seen as the ones most likely to shape the business environment: the adoption non-proprietary approach in developing software and the adoption of value-adding approach in providing services during the life cycle of facilities. Based on the survey and data, the most wanted scenario is identified as well as different roadmaps toward most wanted scenario.

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Full text: http://www.itcon.org/2002/9 (available to registered users only)

Series: itcon:2002 (browse)
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Konig, Markus; Beissert, Ulrike; and Bargstaedt, Hans-Joachim

Visual Simulation - An Appropriate Approach to Support Execution Planning in Building Engineering

Abstract: This paper focuses on a simulation concept to visualize and to analyze outfitting processes in building engineering. A constraint-based simulation model is used to specify dependencies between outfitting tasks, availability of resources and required work spaces. Further, the model is used to specify conditions of transport processes, delivery dates as well as time and cost restrictions. By using a constraint-based simulation model practicable schedules can be generated and visualized simultaneously. For example, execution conflicts such as restricted work spaces are highlighted. Afterwards, the simulated and visualized results can be evaluated in terms of work and material flow organization, utilization of space and worker’s efficiency. This constraint-based simulation approach guarantees a high flexibility. Thus, if additions or new prerequisites, for example, during project meetings are suggested, they could be easily implemented by defining or removing certain constraints such as requirements or production strategies. In the same manner, the current project status could be entered. Adjustable simulation components for transport control, spatial management, material management and assembling control as well as for visualization and animation are developed.

Keywords: visual simulation, constraint-based modeling, planning support, outfitting processes

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Full text: content.pdf (292,426 bytes) (available to registered users only)

Series: convr:2007 (browse)
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Lavrencic,Darko

THE INTRACRANIOVERTEBRAL VOLUMES, THE CEREBROSPINAL FLUID FLOW AND THE CEREBROSPINAL FLUID PRESSURE, THEIR HOMEOSTASIS AND ITS PHYSICAL REGULATION

Abstract: Preface. After publication of the presented hypothesis some predictions were verified independently by other authors: (1) Monro-Kellie "four compartments" doctrine, (2) relation between CSF formation and CSF removal in physiological phase as presented with illustrative curves, (3) hypovolemia during intracranial hypotension syndrome, (4) increased CSF proteins in decreased CSF flow and (5) influence of neuro-vegetative system on CSF pressure. The predictions not yet verified: (1) turning points B-low and B-high that represent physiological borders, (2) pathophysiological self-sustaining phases of low and high CSF pressure with corresponding minimal or maximal CSF volume (maximal dural sac collapse or distension) and no CSF transport, (3) compensated and de-compensated conditions. None of the predictions were disproved yet. The purpose of this presentation on the INTERNET is to promote further discussions about unverified predictions and to encourage clinical research and experimenting in this direction. Summary. Physiological and pathophysiological processes in the intracraniovertebral space are specific because of its rigid and constant volume (Monro-Kellie doctrine). The hypothesis presents how the homeostasis of the intracraniovertebral compartments' volumes, cerebrospinal fluid (CSF) flow and CSF pressure is physically regulated. The hypothesis takes into account the quantitative and qualitative relations regulating CSF formation and CSF removal on which the homeostasis is based.

Keywords: cerebrospinal,fluid,intracranial,hydrodynamics,formation,production,reabsorption,pressure,hypothesis,flow,homeostasis,physical,CSF,hypotension,hypertension,circulation,dural,sac,sinuses,venous,sinuses,extradural,epidural,chorioideus,plexus,hypovolemia,hydrocephalus,subarachnoidal,space,ventricles,arachnoidal, villi,granulations,cribriform,plate,canalis,centralis

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Full text: content.lavrenč (696,205 bytes) (available to registered users only)

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Massimiliano Luzi and Igal M. Shohet

Optimal Maintenance of Below-Grade Culverts

Abstract: In Israel, below-grade culverts are critical structure as they are essential points of the water transport network across the country. A lack of maintenance may create safety hazards and economic loss. The current maintenance strategy is that of breakdown maintenance. Such strategy has the drawback of high repair and maintenance costs. This study presents a methodology to determine the optimal maintenance strategy for below-grade culverts during their design life, by evaluating life cycle performances and life cycle costs. A field survey aimed at collecting critical data to develop a suitable deterioration pattern model. An exponential model was found to be the most significant statistically. A Markov chain model was implemented to determine the culvert life cycle performances and life cycle costs. A Maintenance Effectiveness Indicator (MEI) determines the best life cycle maintenance strategy among: breakdown, performance-based, and preventive maintenance. The best maintenance strategy was found to be the preventive. It provides with the highest cost effectiveness and allows for knowing the required budget in advance. Preventive maintenance strategy, which is strongly associated with Lean Construction, permits to save 80% of the resources required under the breakdown maintenance regime. The methodology can be extended to other assets of the roadway infrastructure.

Keywords: Asset Management, Culverts, Markov Chains, Preventive Maintenance

DOI: https://doi.org/10.24928/JC3-2017/0208

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