| 1. |
- Allard, Ingrid, 1986-, et al.
(author)
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Energy evaluation methods for residential buildings in Nordic countries
- 2012
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In: Proceeding of the Technoport Conference. - : Elsevier.
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Conference paper (peer-reviewed)abstract
- To meet the goals of the directive 2010/31/EU on the energy performance of buildings, the building sector in Europe now faces a transition towards more energy efficient buildings. Research and development of new energy solutions and technology will be necessary for the transition and the importance of measuring and evaluating building energy performance increases. This paper attempts to review and evaluate different methods that are commonly used to analyze energy performance in residential buildings in Nordic countries, primarily in Sweden, Norway and Finland. A short international review of regulations is also included. Some advantages and disadvantages of each method are discussed, as well as commonly used methods in the three countries. Although the three Nordic countries have similar climate conditions and building traditions, the study shows that there exist relatively large variations in defining parameters related to energy performance in residential buildings, such as energy use, heated area, and climate zones. The outcome of the regulations could be investigated by adapting the codes on a selected set of buildings. Common analyzing methods, or parts of methods, are found to be used in several countries. These aspects may be considered in further work to develop more accurate and easily comparable methods to evaluate energy performance for residential buildings in cold climate.
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| 2. |
- Grundberg, Staffan, 1961-, et al.
(author)
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Dynamics of axially loaded and partially Interacting composite beams
- 2012
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In: ECCM15. - : ECCM15. - 9788888785332
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Conference paper (peer-reviewed)abstract
- The aim of this paper is to study the dynamics of partially interacting composite beams subjectedto axial loads, a situation occurring in e.g. beam-columns. The eigenfrequencies arederived for the simply supported composite beam subjected to an axial force. Measurements ofthe fundamental frequencies of a simply supported composite beam consisting of three layersare carried out considering different values of the applied axial force. The agreement betweenthe theoretical and experimental results is discussed. It is also shown that the application ofthe axial force introduces frictional moments at the boundaries, which make the experimentalboundary conditions deviate somewhat from those of an ideal simply supported beam.
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| 3. |
- Hassan, Osama. A.B. 1969-
(author)
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Dyslexia and learning in view of the socio-cultural theory and development psychology
- 2023
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In: Social Science & Humanities Open. - Amsterdam : Elsevier. - 2590-2911. ; 8:1, s. 100718-100718
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Journal article (peer-reviewed)abstract
- This study attempts to apply the socio-cultural learning theory together with the developmental psychology theory to create a better insight into how learning and teaching methods can be made more efficient for university students who have reading and writing difficulties/dyslexia. Pedagogical and didactic methods are derived, based on the sociocultural perspective, Bronfenbrenner's ecological system theory and the author's observations as a teacher in the classroom to help minimize the problem of learning for students with dyslexia. Learning and the learning environment as dictated by these theories can enable the production of pedagogical and didactic methods to streamline the learning of students with dyslexia within the framework of university education.
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| 4. |
- Hassan, Osama A.B. 1969-
(author)
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Effect of foundation designs of passive house on the thermal bridges at the ground
- 2016
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In: Journal of Engineering, Design and Technology. - : Emerald Group Publishing Limited. - 1726-0531 .- 1758-8901. ; 14:4, s. 602-613
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Journal article (peer-reviewed)abstract
- 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.
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| 5. |
- Hassan, Osama A. B., 1969-
(author)
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New Methods for Reducing Ground-Borne Noise in Buildings above Railway Tunnels
- 2003
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Doctoral thesis (other academic/artistic)abstract
- The rapid expansion of major cities in the west Europeancountries has accentuated the need to exploit every potentialsite for new establishments, e.g. areas over train tunnels andnear railway tracks in general. A significant impediment toexploit such areas is the structure-borne noise generated bythe train traffic, which is transmitted into buildings via theground. Reliable prediction methods and cost-effective noisecontrol measures are therefore needed and are also the objectof the present work. In this thesis, the studied buildings areconsidered as wave-guides for the sound transmitted from theground. The work is restricted to the case of hard ground suchas granite. The chosen technique permits comparison betweendifferent potential measures to reduce the transmission ofstructure-borne sound upward in buildings. It is shown that thedesign of the load-bearing structures is important in thiscontext, and a design with relocated columns has givenpromising results. It is also shown that the stiffness of theground plays an important role in the transmission process.This leads to the idea that a sand layer between the foundationof the building and the bedrock may reduce the transmission.New methods have thus been developed in the course of this workto evaluate the stiffness of the layer using approximate andexact techniques. Results are presented and a comparison ismade with previous results for a "normal" building and it isshown that the insertion of sand layer has a potential toconsiderably reduce the sound level in the building.Keywords:Ground-borne noise, railway noise, in-planewaves, wave-guides, scattering, propagation constant, inputmobility, elastic stratum, dual integral equations.
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| 6. |
- Hassan, Osama, 1969-, et al.
(author)
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A comparative study between glulam and concrete columns in view of design, economy and environment
- 2022
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In: Case Studies in Construction Materials. - Amsterdam, Netherlands : Elsevier. - 2214-5095. ; 16
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Journal article (peer-reviewed)abstract
- In this paper, it is attempted to study possible sustainability solutions for building structures. In this context, comparisons are made between two load-bearing columns with different building materials – glued laminated timber and concrete – with regard to structural design, economic consequences and the emission of greenhouse gases. In terms of structural design, the results show that with small axial forces, glulam columns will result in smaller cross-sectional areas compared to concrete columns. However, at larger axial forces, concrete columns will result in smaller cross-sectional areas than glulam columns. An increased column length also means larger dimensions for glulam columns, but this does not always apply to concrete columns. With respect to environmental impact, it is shown that using glulam columns is the more environmentally friendly option. From an economic point of view, the cost estimates for glulam and concrete columns may vary depending on the country and the abundance of the construction material. In Sweden, a forest-rich country, it is shown that the costs for both column types are quite similar considering small axial loads. At higher axial loading, concrete is generally the cheaper alternative.
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| 7. |
- Hassan, Osama, 1969-
(author)
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A Simplified Procedure to Determine the Deflection of Statically Indeterminate Structures
- 2014
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In: International Journal of Aerospace and Lightweight Structures. - Singapore : Research publishing. - 2010-4286 .- 2010-4294. ; 4:4, s. 241-253
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Journal article (peer-reviewed)abstract
- 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.
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| 8. |
- Hassan, Osama, 1969-
(author)
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A simplified structural analysis of statically indeterminate continuous thick beams
- 2016
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In: International Journal of Mechanical Engineering Education. - : Sage Publications. - 0306-4190 .- 2050-4586. ; 44:4, s. 257-271
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Journal article (peer-reviewed)abstract
- In the study presented here, a simplified exact analytical solution of the problem of indeterminate continuous beams is derived and compared with the numerical solution, finite element. For the analytical method, the structure is divided into a simply supported element with internal support moments. The moments are first calculated with the help of boundary rotation conditions by taking into account both the shear andbending deformations. Second, the deflection functions of the beam members are derived. The results of a two-span continuous beam show that both methods yield an excellent agreement. The advantage of the presented method is that it is simplified, general, not time-consuming, and it can be standardized to this type of structures. Solution methods discussed in this paper can be of interest within the framework of mechanical and civil engineering education in which bending and shear of thick beamsare taught.
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| 9. |
- Hassan, Osama, 1969-
(author)
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An integrated approach to assessing the sustainability of buildings
- 2016
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In: Journal of Engineering, Design and Technology. - London : Emerald Group Publishing Limited. - 1726-0531 .- 1758-8901. ; 14:3, s. 835-850
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Journal article (peer-reviewed)abstract
- 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.
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| 10. |
- Hassan, Osama, 1969-, et al.
(author)
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Assessment of human-induced vibrations in composite timbre floors
- 2012
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In: Proceedings of the 15th European Conference on Composite Materials. - Italien. - 9788888785332
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Conference paper (peer-reviewed)abstract
- The authors investigate the human induced vibrations in typical composite timber floors inresidential buildings. Assessment methods given in different design codes and guidelines,such as the Eurocode, are discussed. A case study analysis based on the differentmethodologies is carried out to assess the acceptability of a specific timber floor. Twoextreme cases are considered: full and non-composite action. It is shown that compositeaction improves the floor acceptability for general residential applications. The limitations ofthe different criteria given in the codes and guidelines for assessing floor vibrations in timberfloor structures are discussed and, also, the possible improvement of these criteria.
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