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  • 1.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    A Simplified Procedure to Determine the Deflection of Statically Indeterminate Structures2014In: International Journal of Aerospace and Lightweight Structures, ISSN 2010-4286, Vol. 4, no 4, p. 241-253Article in journal (Refereed)
    Abstract [en]

    In the study presented here, the problem of calculating deflection of stati-cally indeterminate continuous beams and structural frames is addressed. Theelastic line equation, taught in many standard courses in structural mechan-ics is used to determine the structure deflections.In the investigated method,the structure is divided into a simply supported members in which the elas-tic line equation is applied to calculate the deflection shape of the structure.The results are compared with the finite element method (FEM) and goodagreement is obtained. Moreover, the advantage of this method is that it issimplified, general, not time-consuming, and it can be standardised to thistype of structures.

  • 2.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    An integrated approach to assessing the sustainability of buildings2016In: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901, Vol. 14, no 3, p. 835-850Article in journal (Refereed)
    Abstract [en]

    The sustainability of the built environment is increasingly becoming an urgent issue for modern society. In this context, assessing the sustainable development of buildings will be an effective tool in managing and monitoring the progress of the sustainability performance on a local and/or global scale. In this paper, there is an attempt to integrate two methods of assessing the sustainability of buildings. The first method applies the concept of composite indicators. The other method applies the weighted utility function, using the value-focused thinking approach of mathematically modelling and constructing composite indicators. A tentative index to evaluate the sustainability of buildings is proposed, based on this integrated approach. The suggested method can give the assessor the opportunity to analyse the potential improvement that can be carried out in order to improve the sustainable development of buildings in the long and short term. Finally, the role of benchmarking in improving the sustainability performance of buildings is discussed in relation to the suggested method.

  • 3.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    On the structural stability of timber members to EurocodeIn: Mechanics based design of structures and machines, ISSN 1539-7734, E-ISSN 1539-7742Article in journal (Refereed)
    Abstract [en]

    This study investigates the load-bearing behaviour of timber members subjected to combined compression and bending based on the guidelines of the standard Eurocode 5. In this context, two design approaches are stated to account for flexural buckling: the effective length method and the second-order analysis. Although Eurocode 5 states that second-order analysis can be carried out to check the stability of beam-columns, it does not mention how to formulate this analysis. This study investigates this case in order to develop alternative interaction formulae to check the stability of timber members subjected to simultaneously acting axial compression and bending moments with risk of buckling failure. Firstly, expressions are derived to formulate the interaction formulae based on second-order analysis. Secondly, the derivedinteraction formulae are compared with Eurocode 5 formulation. A parametric study is carried out to compare the two methods and the differences between results are discussed. The second-order analysis advanced in this paper can be an alternative tool to be used by the structural engineer to assess the stability of axially loaded members subjected to the risk of flexural buckling failure.

  • 4.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Practical expressions to calculate the main vertical actions on load-bearing columns/walls to Eurocode2017In: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901, Vol. 15, no 7, p. 418-435Article in journal (Refereed)
    Abstract [en]

    Purpose – The aim of this review study is to present useful and practical expressions to compute the design vertical actions on load-bearing columns/walls of typical building structures on the basis of EN 1991: Eurocode 1.

    Design/methodology/approach – It is derived by a typical case in which wind actions, snow actions and permanents actions are loading a roof construction. The results are finally used to calculate the loading on columns/walls. Both ultimate limit state and serviceability limit state are considered.

    Findings – From an instructive point of view, the advantage of this method is that it is simplified, general, not time-consuming, and it can be standardised to typical building structures.

    Research limitations/implications – A number of example applications are introduced to illustrate the calculation procedure.

    Practical implications – From an educational point of view, this problem is of interest to civil engineering students because the reviewed method is not cumbersome or time-consuming.

    Social implications – From an engineering educational point of view, this problem is of interest to civil engineering students because the reviewed method is not cumbersome or time-consuming.

    Originality/value – New formulated expressions to calculate the loadings on structural membranes based on Eurocode are presented.

  • 5.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    The role of peer-learning and formative assessment in effective engineering learning environments: A case study2014In: Journal of Applied Research in Higher Education, ISSN 2050-7003, E-ISSN 1758-1184, Vol. 6, no 2, p. 285-294Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to investigate the role of peer learning and formative assessment as two creative learning methods in engineering learning environments. The results show that both models have yielded promising results with regard to meeting the criteria for the expected learning outcomes of the curriculum. However, the integrated model has resulted in better results than the model of formative assessment. The paper discusses also some practical and theoretical aspects related to the learning models.

    Design/methodology/approach – It is advanced two general learning models; in the first model, the formative assessment is integrated with peer learning and in the second one, the formative assessment is solely used to enhance the learning. A field case study is conducted to investigate the effect of using the learning models on the expected learning outcomes of the students in an engineering course.

    Findings – The results show that both learning models have yielded promising results with regard to meeting the criteria for the expected learning outcomes of the curriculum. However, the integrated model has resulted in better results than the model of formative assessment.

    Research limitations/implications – The two models can be applied for the engineering course that has both practical and theoretical aspects. It is expected that areas of expertize in engineering education can be developed very well with the models.

    Practical implications – The results show that the two learning models have yielded promising results with regard to meeting the criteria for the expected learning outcomes of the curriculum and that formative assessment link to good learning practice does indeed give improved learning.

    Social implications – Increase the effectiveness of learning in engineering education.

    Originality/value – Case study based on observation and planning.

  • 6.
    Hassan, Osama A.B.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Effect of foundation designs of passive house on the thermal bridges at the ground2016In: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901, Vol. 14, no 4, p. 602-613Article in journal (Refereed)
    Abstract [en]

    In this paper it is attempted to study the effect of different foundation designs of passive house on the resultant thermal bridges, at the junction between a wall and a slab on grade. The linear thermal transmittances of some newly developed foundations of passive house are determined. The compared foundation designs are L-element, U-element and foundation with foam glass technique. It is found that the special design of passive house foundation can considerably influence the heat flow through thermal bridges. The calculated linear thermaltransmittances of L-element, U- element and foundation with foam glass are 0.085 W/mK, 0.074 W/mK and 0.031 W/mK, respectively. In this context, it is proposed a new foundation design of passive house, which has relatively low heat loss through thermal bridges, calculated as 0.031 W/mK. The results are compared with the “default” ISO values used to evaluate the effect of thermal bridges in typical buildings. It is found that there is large difference between the calculated linear thermal transmittances at the investigated foundationsof passive house as compared to typical buildings.

  • 7.
    Hassan, Osama
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Christopher, Johansson
    Byggprojektering, WSP Sverige AB, Linköping, Sweden.
    Glued laminated timber and steel beams: A comparative study of structural design, economic and environmental consequences2018In: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901Article in journal (Refereed)
    Abstract [en]

    Purpose – This paper compares glued laminated timber and steel beams with respect to structural design, manufacturing and assembly costs, and the amount of greenhouse gas emissions.

    Design/methodology/approach – This paper presents structural design requirements in conformance with EN 1993: Eurocode 5 and Eurocode 3. With the help of these standards, expressions are derived to evaluate the design criteria of the beams. Based on the results of life-cycle analysis, the economic properties and environmental impact of the two types of beam are investigated. In this paper, the effect of beam span on the design values, costs and carbon dioxide emissions is analyzed when investigating aspects of the structural design, economy and environmental impact. Different cross-sections are chosen for this purpose.

    Findings – The study shows that the glued laminated (abbreviated as glulam”) beams have a smaller tendency to lateral torsional buckling than the steel beams, and that they can be cheaper. From an environmental point of view, glulam beams are the more environmentally friendly option of the two beam materials. Furthermore, glulam beams may have a direct positive effect on the environment, considering the carbon-storage capacity of the wood. The disadvantage of glued wood is that larger dimensions are sometimes required.

    Research limitations/implications – Wind load and the effect of second-order effects have not been considered when analysing the static design. Only straight beams have been studied. Furthermore, the dynamic design of the beams has not been investigated, and the bearing pressure capacity of the supports has not been analyzed. We have investigated timber beams with a rectangular cross-section, and steel beams of rolled I-sections, known as “HEA profiles”. The cost analysis is based mainly on the manufacturing and assembly costs prevalent on the Swedish market. The only environmental impact investigated has been the emission of greenhouse gases. The design calculations are based on the European standards Eurocode 5 and Eurocode 3.

    Practical implications – To achieve sustainability in construction engineering, it is important to study the environmental and economic consequences of the building elements. By combining these two effects with the technical design of buildings made of steel and/or timber, the concept of sustainable development can be achieved in the long run.

     Social implications – The study concerns sustainability of building structures, which is an important of the sustainable development of the society.

     Originality/value – The paper contains new information, and will be useful to researchers and civil engineers.

  • 8.
    Hassan, Osama
    et al.
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    Jonsson, Petra
    Lindbäcks bygg, Piteå.
    Lecablock, an Alternative Construction Material for the Exterior Walls of Passive House2014In: Journal of Building Construction and Planning Research, ISSN 2328-4889, Vol. 2, no 2, p. 96-108Article in journal (Refereed)
    Abstract [en]

    In this paper it is attempted to investigate the Leca blocks as sustainable construction material forthe exterior walls of passive house. The building physical properties of Leca design wall structureare studied along with the environmental impact and load-bearing capacity. To compare the results,a similar analysis is carried out considering the traditional wooden wall construction of passivehouses. The results showed that Leca design wall structure can be an alternative sustainablesolution to the traditional wooden wall structure of passive house, mainly due to its low U-value,its ability to handle moisture, and comparable structural load-bearing capacity. However, thewooden wall structure is more environmentally friendly than the Leca blocks due to its loweremissions to the environment and reduced energy use, especially during the manufacturing process.

  • 9.
    Hassan, Osama
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Schedin, Staffan
    Umeå universitet.
    Lundgren, Nils
    Umeå universitet.
    Girhammar, U.A
    Lulleå tekniska universitet.
    Experimental verification of static buckling of partially composite beams and beam-columns2015In: Proceeding Advanced Materials World Congress, 2015, Vol. 1Conference paper (Refereed)
    Abstract [en]

    The authors present an experimental study on static buckling of partially composite beams and beam-columns. In this context, a composite wall segment is tested consisting of timber studs connected to specially designed plywood board by means of shear connectors. The critical loads that characterise the buckling of timbre beams/columns with partial composite action are calculated both experimentally and theoretically. A good agreement is obtained between the analytical and experimental results. Further, it is discussed from the practical point of view that factors, which affect the deviation between the theoretical and experimental results. 

  • 10.
    Hassan, Osama
    et al.
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Öberg, Fredrik
    Huskvarna, Sweden.
    Gezelius, Emil
    Katrineholm, Sweden.
    Cross-laminated timber flooring and concrete slab flooring: A comparativestudy of structural design, economic and environmental consequences2019In: Journal of Building Engineering, E-ISSN 2352-7102, Vol. 26, p. 1-16, article id 100881Article in journal (Refereed)
    Abstract [en]

    This paper compares cross-laminated timber (CLT) flooring and concrete slab flooring with respect to structural design, cost analysis, and greenhouse gas emissions. The effect of floor span on design values, costs, and carbondioxide emissions is analysed in terms of structural design, economy, and environmental impact. Different crosssections are chosen for this purpose. The study shows that CLT flooring has significantly lower emissions ofclimate-impact greenhouse gases, and its ability to store carbon is significantly greater than the capacity of concrete storage. From an economic point of view, the CLT material is more expensive than concrete. However, the estimated “ready-to-assemble” cost of both floor types is quite similar. The study shows that CLT flooring can compete with a concrete slab floor when it comes to a span as wide as 7m without violating the structural requirements. However, with an increase in span, it is more difficult to meet the requirements for vibration for aCLT floor than for a concrete slab. At shorter spans, the moment capacity is often a decisive factor for concrete slabs while deformation is the decisive factor for a CLT floor. For larger spans, resonance frequency and deformation are crucial for the CLT floor, while the long-term deformation of the concrete is the decisive factor in structural design.

  • 11.
    Schedin, Staffan
    et al.
    Umeå universitet.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
    An integrated learning model in collaboration with industrial partners2014In: Proceedings of the 10th International CDIO Conference, Spain: Universitat Politècnica de Catalunya , 2014Conference paper (Refereed)
    Abstract [en]

    We present an integrated learning model based on an organized collaboration with  industrial partners in the surrounding geographic region. As a part of the collaboration, each participating student is guaranteed internships at a chosen company over the summer period. In the model, company based projects are integrated with some of the study program courses. Moreover, the participating students are given a possibility to perform their final thesis at the chosen company. We consider this collaboration as a "win-win situation" for the three parties involved in the learning model: the students, the University/faculty and the industrial partners. A number of positive effects have been observed and documented as follows:

    i) the integrated learning improves the learning process for the students, where learning, knowledge and practice are integrated into the engineering curricula;

    ii) The general quality of the study programs in the faculty has been developed and improvedbased on the professional skills as required by modern industrial companies;

    iii) The obtained advantage for the industrial partners has been to establish professionalcontacts with the students as well as the possibility to be acquainted with potential future employees

  • 12.
    Schedin, Staffan
    et al.
    Umeå universitet, Umeå, Sweden.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    WORK INTEGRATED LEARNING MODEL IN RELATION TO CDIO STANDARDS2016In: Journal of Applied Research in Higher Education, ISSN 2050-7003, E-ISSN 1758-1184, Vol. 8, no 3, p. 278-286Article in journal (Refereed)
    Abstract [en]

    In this paper, it is attempted to develop a model of work integrated learning for undergraduate engineering students in relation to the international CDIO-initiative1 standard 7 (Integrated Learning Experiences) and 8 (Active Learning). The model is based on an organized collaboration with a number of industrial partners in the surrounding geographic region. As a part of the collaboration, each participating student is guaranteed an internship at a chosen company during two summer periods. In the model, company based projects are integrated with some of the study program courses.Moreover, the participating students are given a possibility to perform their final thesis at the chosen company. The evaluation of the model shows that that the company based projects promote interdisciplinary learning as well as fostering system building skills and personal communication skills. Moreover, the developed learning model supports the expected learning outcomes, especially with regards to interpersonal skills, teamwork and communication. Moreover, it is discussed the roleof cultural- social perspective and peer-learning in enhancing the developed learning model from apedagogical point of view.

  • 13.
    Verde, Jakob
    et al.
    Sweco Management AB.
    Hassan, Osama
    Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
    Uttorkning av betong– En praktisk uppföljning av mätningar från byggskedet2018In: Bygg och Teknik, ISSN 0281-658X, no 5, p. 56-58Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Den vanligaste konstruktionen nuförtiden vid byggnation av hus är platta på mark. Konstruktionen har varit vanligt förekommande i olika varianter sedan 50-talet. På grund av dess markkontakt har fuktproblem uppstått i konstruktionen av olika anledningar och konstruktionen har med tiden förbättrats för att undvika framtida problem. Dagens konstruktion kan få fuktproblem om den inte får torka ut ordentligt innan ytskikt applicerats och uttorkningen till största del långsamt upphör. De krav som ställs på uttorkning idag baseras på den kunskap och de erfarenheter som samlats in i äldre konstruktioner. På senareår har utvecklingen av betong gått framåt och idag används en betongmed betydligt lägre vct (vattencementtal) än tidigare. Hur denna betong med ytskikt torkar ut och uppför sig med hänsyn till eventuella fuktproblem finns det inte så många fältstudier på. Resultatet från studiet visar på att trots erforderlig uttorkning har skett finns det ändå höga halter kemiska föreningar under ytskikten som visar på att skador till följd av fukt har uppkommit.

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