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  • 1.
    Alizadehsalehi, Sepehr
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science. Civil Engineering Department, Eastern Mediterranean University, Turkey.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science. Civil Engineering Department, Eastern Mediterranean University, Turkey.
    Celik, Tolga
    Civil Engineering Department, Eastern Mediterranean University, Turkey.
    Arditi, David A.
    Department of Civil and Architectural Engineering, Illinois Institute of Technology, United States.
    The effectiveness of an integrated BIM/UAV model in managing safety on construction sites2018In: International Journal of Occupational Safety and Ergonomics, ISSN 1080-3548, E-ISSN 2376-9130, p. 1-16Article in journal (Refereed)
    Abstract [en]

    Introduction. A variety of approaches exist to achieve better construction safety performance, but only a few consider a combination of building information modeling (BIM) and unmanned aerial vehicles (UAVs).

    Method. This article presents a four-dimensional (4D) BIM/UAV-enabled safety management model based on IDEF0 language. In the first step, potential hazards are identified with the help of safety specialists’ experiences and BIM software used in the design of the structure. Then, a UAV monitors the location of the potential hazards. The third step involves the integration of the 4D BIM-based model and the information obtained from the UAV. Finally, the combined data are analyzed and interpreted, and site safety staff are notified about measures to be put in place to prevent accidents.

    Results. This model shows a strong relationship between the design and construction phases by using BIM in the design phase and UAVs in the construction phase. The proposed safety model was evaluated by construction safety specialists in a two-pronged approach.

    Conclusion. The number of fatal, non-fatal and property damage-causing accidents may be significantly lower when the proposed system was used.

    Practical application. This model allows safety specialists to identify hazards and develop suitable mitigation strategies. 

  • 2.
    Erkul, Mehmet
    et al.
    Eastern Mediterranean University, Department of Civil Engineering, Famagusta, North Cyrus.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science. Department of Civil Engineering, Eastern Mediterranean University, Famagusta, Cyprus.
    Celik, Tahir
    Cyprus International University, Department of Civil Engineering, Nicosia, North Cyprus.
    Dynamics of stakeholder engagement in mega transport infrastructure projects2019In: International Journal of Managing Projects in Business/Emerald, ISSN 1753-8378, E-ISSN 1753-8386, ISSN 1753-8378Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to investigate the practice of stakeholder engagement as a social network dynamics for stakeholder satisfaction and project success in the lifecycle of mega transport infrastructure projects (MTIPs).

    Design/methodology/approach – Hypotheses indicating the positive relationships between stakeholders’ effective attributes, stakeholder engagement as social network dynamics and project success through stakeholders’ satisfaction have been developed. Based on a questionnaire survey and semi-structured interviews, responses have been gathered from the representative groups and organizations on their social network dynamics for their satisfaction and project success. A hypothesized structural equation model has been tested using AMOS statistical software package.

    Findings – The analysis highlighted the engagement of the stakeholders within the strategic intents of the project with the public needs and expectations. The model depicts the processes of building social network models based on the capturing of the project’s data in relation to the stakeholders’ communication and satisfaction across the key issues for success in the lifecycle of MTIP.

    Practical implications – The model is applicable on most MTIP with a diverse stakeholder base and the underlying complexity associated with the community participation and consultation processes. The model will also support wider stakeholder engagement in the planning of MTIP with optimal operationalization and service delivery from a community perspective.

    Originality/value – The research involves an approach for rationalizing the stakeholder engagement policies of the MTIPs by providing an empirically grounded model simultaneously linking various aspects of stakeholder effective attributes, stakeholder engagement and their relationships to stakeholder satisfaction and project success in MTIPs.

  • 3.
    Movaffaghi, Hamid
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science. University of Borås, Faculty of Textiles, Engineering and Business.
    Pyykkö, J.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Svensson, S.
    Uppsala University, Division of Applied Mechanics, Ångström Laboratory .
    Large Span Timber Buildings Under Horizontal Forces2019Conference paper (Refereed)
    Abstract [en]

    In timber concrete composite (TCC) floor systems the concrete contributes to increase of the stiffness and research is ongoing to develop large span TCC floor systems with less supporting walls to create both modular flexibility and wide-open spaces. Nevertheless, removing supporting walls can degrade structural performance against horizontal forces (Ferdous, et al., 2019). Meanwhile both the height of the structure and the type of floor diaphragm (rigid or flexible) has influence on the magnitude of the lateral loads transferred to the supporting shear walls. This is a challenge, not least when prefabricated elements are used; the individual elements have to be connected to form a continuous floor diaphragm.

    The main aim of this paper is to study lateral load transferred to the shear walls through the TCC floor with both rigid and/or flexible diaphragms in low and medium-rise timber buildings. The focal point of the study is the analysis and design of floor elements and connection systems connecting the TCC floor elements to each other as well as to the adjoining structure.

    The case studies for low and medium-rise timber structures have been analyzed both using finite element modelling and analytical methods based on both deep beam theory and beam or diaphragm actions depending on the height of the structure. The results in this study indicate that the magnitude of load transferred to the shear walls depends on both the height of the structure and the type of floor diaphragms. The structural performance in terms of stability can be enhanced by effective use of connection systems of TCC floor elements.

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  • 4.
    Movaffaghi, Hamid
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Pyykkö, Johan
    Uppsala University – Division of Applied Mechanics, Ångström Laboratory.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Multi-Objective and Multi-Criteria Approach for Value-Driven Design in Industrialized Residential Multi-Storey Timber-Building2019In: Computational Methods in Wood Mechanics – from Material Properties to Timber Structures. / [ed] Thomas K. Bader, Josef Füssl, Anders Olsson, Växjö, 2019Conference paper (Refereed)
    Abstract [en]

    Serviceability in terms of springiness, vibration and deflection [1], as well as sustainability in terms of climate impact and costs [2] have been identified as the most important aspects for appropriate functioning in residential multi-storey timber-buildings. Thus, the aim of this study is focused on product development of a timber-concrete composite (TCC) floor system by 1) enhancing serviceability performances of the floor for larger spans (above 6 m) in terms of stiffness and dynamic response, and 2) reducing both climate impact (CO2-emissions) and costs, by optimizing material usage. As the case study a timber structure of a residential multi-storey building, including concrete ground floor and shaft, with the overall dimensions ܮൈܹൈܪൌ30ൈ11ൈ14 ሾ݉ଷሿ has been studied. The geometry of the load bearing structural elements has been modelled using finite element programs. As serviceability criteria for the floors, the deflection due to a point load was chosen. The deflections were related to comfort classes given in [3] and transverse load distribution was taken into account according to [4]. The deflection and effective bending stiffness (EIef in EC5 Annex B) were chosen as objective functions, while thickness of concrete slab and shear stiffness of the connection between glulam beam and concrete slab were chosen as design variables in a multi-objective optimization. The relationship between connection stiffness and height of the concrete slab for comfort class B can be seen in Figure 1. In the figure the cross-section of the TCC floor structure, with a span of 7.5 m, is also depicted. Figure 1: Connection stiffness-concrete thickness relationship and cross-section for the TCC floor. After optimization, a multi-criteria analysis was applied to select a design solution from the Pareto optimal front, satisfying some subjective preferences of the stakeholders for value-driven design. The results in this study integrates serviceability, environmental and economic performances for value-driven design and supports decision making in the early phases of a project, where various alternatives can be analyzed and evaluated. 

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  • 5.
    Movaffaghi, Hamid
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Developing a framework of a multi-objective and multi-criteria based approach for integration of LCA-LCC and dynamic analysis in industrialized multi-storey timber construction2018In: Advances in Informatics and Computing in Civiland Construction Engineering: Proceedings of the 35th CIB W78 2018 Conference: IT in Design, Construction,and Management, Chicago, 01-03 October 2018 / [ed] I. Mutis & T. Hartmann, Cham, Switzerland: Springer, 2018, Vol. 1, p. 447-454, article id 53Conference paper (Refereed)
    Abstract [en]

    To improve organizational decision-making process in construction industry, a framework of a multi-objective andmulti-criteria based approach has been developed to integrate results from Life-Cycle Analysis (LCA), Life-Cycle CostAnalysis (LCC) and dynamic analysis for multi-storey industrialized timber structure. Two Building InformationModelling (BIM)-based 3D structural models based on different horizontal stabilization and floor systems will beanalyzed to reduce both climate impact, material and production costs and enhance structural dynamic response of thefloor system. Moreover, sensitivity of the optimal design will also be analyzed to validate the design. The multi-objectiveand multi-criteria based LCA-LCC framework analyzing the environmental, economic, and dynamic performances willsupport decision making for different design in the early phases of a project, where various alternatives can be created andevaluated. The proposed integrated model may become a promising tool for the building designers and decision makers inindustrialized timber construction.

  • 6.
    Muhammad, Abbas Ahmad
    et al.
    Eastern Mediterranean University, Famagusta, Cyprus.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    Alizadehsalehi, Sepehr
    Eastern Mediterranean University, Famagusta, Cyprus.
    Celik, Tolga
    Eastern Mediterranean University, Famagusta, Cyprus.
    Adoption of Virtual Reality (VR) for Site Layout Optimization of Construction Projects2020In: Teknik Dergi, ISSN 1300-3453, Vol. 31, no 2Article in journal (Refereed)
    Abstract [en]

    Among the significant tasks of construction site management, site layout planning is a crucial activity which leads to project success. Currently the concept of an optimized construction site layout emerge as a result of executing tools and techniques that construction project management discipline provides. Despite the plentiful existence of site layout techniques, the authors of this paper believe that incorporation of Virtual Reality (VR) for jobsite organization is a valuable and modern management phenomenon for optimal planning of the site layout planning.  Therefore, the purpose of this paper is to assess traditional practices for site layout planning and introduce the application of VR in construction jobsite organizations involving site layout planning, collision detection and evaluation of construction site layout scenarios. In this paper, two different construction jobsite scenarios for the structural phase of the building construction are created and for optimization purposes implemented through the 3D model developed are on Autodesk Revit software, SketchUp and Lumion. VR box headset is used for testing purposes of the proposed 3D jobsite organization model. A descriptive case study is examined in order to describe the proposed organizational plan for the created scenarios. In this research, questionnaire survey is chosen as one of the research instrument for data collection and evaluation purposes. Results presented in this paper, provide industry professionals with a better understanding of the benefits, advantages and how VR technology improves the effectiveness of jobsite layout planning compared to traditional practices. 

  • 7.
    Ozturk, Gozde Basak
    et al.
    Adnan Menderes University, Faculty of Engineering, Department of Civil Engineering, Aydin, Turkey.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Conceptual Model of Building Information Modeling Usage for Knowledge Management in Construction Projects2019In: IOP Conf. Series: Materials Science and Engineering / [ed] M. Drusa, I. Yilmaz & M. Marschalko, Institute of Physics Publishing (IOPP), 2019, Vol. 471, p. 1-11, article id 022043Conference paper (Refereed)
    Abstract [en]

    Knowledge management (KM) draws on a vital role in highly participatory and diversified working environment of construction projects. Knowledge keeps construction firms competitive and boosts performance high in future work. However, large and chaotic projects require KM achieved with technological support thorough the project life cycle. Building information modelling (BIM) has a wide range of interaction between researchers and practitioners as a new and promising area of technological research and implementation in construction. In the last decade, many researchers worked on the use of BIM in the construction industry. Collaborative interaction is one of the most important promises of BIM. Collaboration between construction professionals can be improved by firmly managed project knowledge. With BIM solutions, it can be easier to externalize, integrate, internalize and socialize knowledge. Operational knowledge and strategic knowledge can be managed through interactive BIM models. This study aims suggesting a conceptual model representing KM process through BIM. A comprehensive literature review on KM and BIM was established to construct the theoretical framework for the assignment of a conceptual model for BIM usage in KM process of construction projects. The proposed conceptual model is a road map for adapting KM process with BIM as a new KM tool. The ability of BIM to manage knowledge is determined. KM process is identified for construction projects. Existing process is reviewed and modified for the BIM usage. In future studies, empirical research will be conducted to strengthen the validation of the proposed model.

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  • 8.
    Tezel, Algan
    et al.
    University of Huddersfield.
    Papadonikolaki, Eleni
    University College London.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Supply Chain and Operations Management.
    Preparing Construction Supply Chains for Blockchain: An Exploratory Analysis2019Conference paper (Refereed)
    Abstract [en]

    Blockchain, a peer-to-peer controlled, distributed database structure, has the potential to profoundly affect the current business transactions in the construction industry through smart contracts, cryptocurrencies, and reliable asset tracking. The construction industry has often been criticized for being slow in embracing emerging technologies and not effectively diffusing those technologies through its supply chains. Often, the extensive fragmentation, traditional procurement structures, destructive competition, lack of collaboration and transparency, low-profit margins and human resources are shown as the main culprits for this. As Blockchain makes its presence felt strongly in many other industries like finance and banking, this paper investigates how to prepare construction supply chains for Blockchain technology through an explorative analysis. Empirical data for the study were collected through semi-structured interviews with 17 subject experts. Alongside presenting a SWOT (strengths, weaknesses opportunities, threats) analysis, the paper exhibits the requirements for and steps toward a construction supply structure facilitated by Blockchain.

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  • 9.
    Tezel, Algan
    et al.
    Department of Architecture and 3D Design, Huddersfield University, Huddersfield, UK.
    Papadonikolaki, Eleni
    The Bartlett School of Construction and Project Management, University College London, London, UK.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Industrial Product Development, Production and Design.
    Preparing construction supply chains for blockchain technology: An investigation of its potential and future directions2020In: Frontiers of Engineering Management, ISSN 2096-0255Article in journal (Refereed)
    Abstract [en]

    Blockchain, a peer-to-peer, controlled, distributed database structure, has the potential to profoundly affect current business transactions in the construction industry through smart contracts, cryptocurrencies, and reliable asset tracking. The construction industry is often criticized for being slow in embracing emerging technologies and not effectively diffusing them through its supply chains. Often, the extensive fragmentation, traditional procurement structures, destructive competition, lack of collaboration and transparency, low-profit margins, and human resources are shown as the main culprits for this. As blockchain technology makes its presence felt strongly in many other industries like finance and banking, this study investigates the preparation of construction supply chains for blockchain technology through an explorative analysis. Empirical data for the study were collected through semi-structured interviews with 17 subject experts. Alongside presenting a strengths, weaknesses, opportunities, and threats analysis (SWOT), the study exhibits the requirements for and steps toward a construction supply structure facilitated by blockchain technology.

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  • 10.
    Yucelgazi, Fikri
    et al.
    Eastern Mediterranean University.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Risk Assessment for Large-Scale Transport Infrastructure Projects2019In: IOP Conference Series: Materials Science and Engineering / [ed] M. Drusa, I. Yilmaz & M. Marschalko, Institute of Physics (IOP), 2019, Vol. 471, p. 1-10, article id 022005Conference paper (Refereed)
    Abstract [en]

    The identification of risks in the planning phase of a project and the arrangement of impact values has become a fundamental basis of today's various construction projects. Despite robust and well-planned projects, unexpected problems will likely emerge in any stage of the project if possible risks are not identified and assessed beforehand. Therefore, this process has become a requisite in increasing the success as well as minimizing the problems of a project. Large-scale transport infrastructure projects (LSTIPs), technologically equipped projects, meet the essential needs of the recent era but also bring about numerous risks such as financial, technical, managerial, political, economic, natural or legal. Hence, being exposed to such risks in the planning and construction stage of LSTIPs, could lead to negative consequences in the fate of the project. This study aims to develop a conceptual framework which provides a pathway for the planning phase and to offer risk lists and their priority orders that reinforce the construction phase. These aims were achieved by identifying the risk factors that could arise in European and Middle Eastern LSTIPs and detecting significances of the risks according to these types of projects. Data collection was performed through a substantial review of literature and a questionnaire conducted to contracting firms and civil engineering consultancies operating in Europe and the Middle East. According to the findings, the comparison between the leading risks encountered in European and in Middle Eastern LSTIPs revealed that two of the regions were confronted with both similar and different risks. Europe and the Middle East's foremost common risk factor is the financial strength of the client listed under the financial category. When regions are considered individually, Europe gives prior importance to the resource availability risk factor in the economic category whereas increased material cost located under the same category is the primary risk factor for the Middle East. As a result, the data obtained from this research study could be deployed as a standardized risk list in the planning stage of forthcoming LSTIPs as well as a guideline for the assessment phase of priority orders. Furthermore, this study suggests a further and detailed investigation on mitigating risks that occur in LSTIPs.

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  • 11.
    Yücelgazi, F.
    et al.
    Department of Civil Engineering, Bahçeşehir Cyprus University, Lefkoşa, Kıbrıs, Mersin 10, Turkey.
    Yitmen, Ibrahim
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    An ANP model for risk response assessment in large scale bridge projects2020In: Civil engineering and environmental systems (Print), ISSN 1028-6608, E-ISSN 1029-0249Article in journal (Refereed)
    Abstract [en]

    Large-scale bridge projects (LSBPs) have emerged due to the gradually increasing transportation needs of the connections between isolated regions. In planning, construction or completion of today’s LSBPs, responses are applied to risks arising in areas such as financial, design, environmental and managerial. The main objective of this study is to prioritise the risk responses from the contractors’ point of view used in LSBPs in Europe and the Middle East by using the analytical network process (ANP). The priorities obtained separately for Europe and the Middle East were compared between each other. The results display that Europe and the Middle East include both common and different risk responses. Two case studies, one in each region, have been conducted to further support the priority values acquired in this study. The priorities and responses obtained in this study can be used as standard risk response list for the prevention or elimination of risks during the planning, construction or completion phases of projects to be implemented in the field of LSBPs in various countries. Lastly, the priorities obtained in this study could be a mirror to detect or juxtapose changes in future studies in the same field.

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