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Hassan, Osama
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Publikasjoner (10 av 13) Visa alla publikasjoner
Hassan, O., Öberg, F. & Gezelius, E. (2019). Cross-laminated timber flooring and concrete slab flooring: A comparativestudy of structural design, economic and environmental consequences. Journal of Building Engineering, 26, 1-16, Article ID 100881.
Åpne denne publikasjonen i ny fane eller vindu >>Cross-laminated timber flooring and concrete slab flooring: A comparativestudy of structural design, economic and environmental consequences
2019 (engelsk)Inngår i: Journal of Building Engineering, E-ISSN 2352-7102, Vol. 26, s. 1-16, artikkel-id 100881Artikkel i tidsskrift, Editorial material (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
Elsevier, 2019
Emneord
Eurocode 2, Eurocode 3, Greenhouse effects, Cost analysis, Timber and concrete slabs
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-159510 (URN)10.1016/j.jobe.2019.100881 (DOI)2-s2.0-85069640267 (Scopus ID)
Tilgjengelig fra: 2019-08-10 Laget: 2019-08-10 Sist oppdatert: 2019-08-15bibliografisk kontrollert
Hassan, O. & Christopher, J. (2018). Glued laminated timber and steel beams: A comparative study of structural design, economic and environmental consequences. Journal of Engineering, Design and Technology
Åpne denne publikasjonen i ny fane eller vindu >>Glued laminated timber and steel beams: A comparative study of structural design, economic and environmental consequences
2018 (engelsk)Inngår i: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901Artikkel i tidsskrift, Editorial material (Fagfellevurdert) In press
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.

sted, utgiver, år, opplag, sider
England: Emerald Group Publishing Limited, 2018
Emneord
Eurocode 5, Eurocode 3, greenhouse effects, cost analysis, timber and steel beams
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-147827 (URN)10.1108/JEDT-12-2017-0130 (DOI)2-s2.0-85046901111 (Scopus ID)
Forskningsfinansiär
Linköpings universitet
Tilgjengelig fra: 2018-05-14 Laget: 2018-05-14 Sist oppdatert: 2018-05-22bibliografisk kontrollert
Verde, J. & Hassan, O. (2018). Uttorkning av betong– En praktisk uppföljning av mätningar från byggskedet. Bygg och Teknik (5), 56-58
Åpne denne publikasjonen i ny fane eller vindu >>Uttorkning av betong– En praktisk uppföljning av mätningar från byggskedet
2018 (svensk)Inngår i: Bygg och Teknik, ISSN 0281-658X, nr 5, s. 56-58Artikkel i tidsskrift, Editorial material (Annet (populærvitenskap, debatt, mm)) In press
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.

sted, utgiver, år, opplag, sider
Stockholm, Sweden: Förlags AB Bygg & Teknik, 2018
Emneord
Betong, platta på mark, uttorkning, fuktmättning, sunda hus
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-148333 (URN)
Tilgjengelig fra: 2018-06-07 Laget: 2018-06-07 Sist oppdatert: 2018-06-13bibliografisk kontrollert
Hassan, O. (2017). Practical expressions to calculate the main vertical actions on load-bearing columns/walls to Eurocode. Journal of Engineering, Design and Technology, 15(7), 418-435
Åpne denne publikasjonen i ny fane eller vindu >>Practical expressions to calculate the main vertical actions on load-bearing columns/walls to Eurocode
2017 (engelsk)Inngår i: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901, Vol. 15, nr 7, s. 418-435Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
UK: Emerald Group Publishing Limited, 2017
Emneord
Eurocode, Structures, load-bearing columns/walls, Variable and permanent actions
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-139843 (URN)10.1108/JEDT-08-2016-0056 (DOI)2-s2.0-85027351907 (Scopus ID)
Forskningsfinansiär
Linköpings universitet
Tilgjengelig fra: 2017-08-17 Laget: 2017-08-17 Sist oppdatert: 2019-07-11bibliografisk kontrollert
Hassan, O. (2016). An integrated approach to assessing the sustainability of buildings. Journal of Engineering, Design and Technology, 14(3), 835-850
Åpne denne publikasjonen i ny fane eller vindu >>An integrated approach to assessing the sustainability of buildings
2016 (engelsk)Inngår i: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901, Vol. 14, nr 3, s. 835-850Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
London: Emerald Group Publishing Limited, 2016
Emneord
Built environment, building sustainability, value-focused thinking, sustainable development, composite indicator, construction management
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-119636 (URN)10.1108/JEDT-12-2014-0077 (DOI)
Prosjekter
Byggteknik
Forskningsfinansiär
Linköpings universitet
Tilgjengelig fra: 2015-06-23 Laget: 2015-06-23 Sist oppdatert: 2018-01-09
Hassan, O. A. .. (2016). Effect of foundation designs of passive house on the thermal bridges at the ground. Journal of Engineering, Design and Technology, 14(4), 602-613
Åpne denne publikasjonen i ny fane eller vindu >>Effect of foundation designs of passive house on the thermal bridges at the ground
2016 (engelsk)Inngår i: Journal of Engineering, Design and Technology, ISSN 1726-0531, E-ISSN 1758-8901, Vol. 14, nr 4, s. 602-613Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
Emerald Group Publishing Limited, 2016
Emneord
Thermal bridges, linear thermal transmittance, passive house, energy efficiency
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-127769 (URN)10.1108/JEDT-09-2014-0059 (DOI)000405490400011 ()
Forskningsfinansiär
Linköpings universitet
Tilgjengelig fra: 2016-05-12 Laget: 2016-05-12 Sist oppdatert: 2018-01-09
Schedin, S. & Hassan, O. (2016). WORK INTEGRATED LEARNING MODEL IN RELATION TO CDIO STANDARDS. Journal of Applied Research in Higher Education, 8(3), 278-286
Åpne denne publikasjonen i ny fane eller vindu >>WORK INTEGRATED LEARNING MODEL IN RELATION TO CDIO STANDARDS
2016 (engelsk)Inngår i: Journal of Applied Research in Higher Education, ISSN 2050-7003, E-ISSN 1758-1184, Vol. 8, nr 3, s. 278-286Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
London: Emerald Group Publishing Limited, 2016
Emneord
CDIO, active learning, peer-learng
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-125951 (URN)10.1108/JARHE-11-2014-0104 (DOI)
Tilgjengelig fra: 2016-03-09 Laget: 2016-03-09 Sist oppdatert: 2018-07-19
Hassan, O., Schedin, S., Lundgren, N. & Girhammar, U. (2015). Experimental verification of static buckling of partially composite beams and beam-columns. In: Proceeding Advanced Materials World Congress: . Paper presented at Advanced Materials World Congress. , 1
Åpne denne publikasjonen i ny fane eller vindu >>Experimental verification of static buckling of partially composite beams and beam-columns
2015 (engelsk)Inngår i: Proceeding Advanced Materials World Congress, 2015, Vol. 1Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
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. 

Emneord
Axial loading conditions; Stratic buckling; composite beam/columns
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-119681 (URN)
Konferanse
Advanced Materials World Congress
Tilgjengelig fra: 2015-06-24 Laget: 2015-06-24 Sist oppdatert: 2015-08-10
Hassan, O. (2014). A Simplified Procedure to Determine the Deflection of Statically Indeterminate Structures. International Journal of Aerospace and Lightweight Structures, 4(4), 241-253
Åpne denne publikasjonen i ny fane eller vindu >>A Simplified Procedure to Determine the Deflection of Statically Indeterminate Structures
2014 (engelsk)Inngår i: International Journal of Aerospace and Lightweight Structures, ISSN 2010-4286, Vol. 4, nr 4, s. 241-253Artikkel i tidsskrift (Fagfellevurdert) Published
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.

sted, utgiver, år, opplag, sider
Singapore: Research publishing, 2014
Emneord
Statically indertminate structures, finite element method
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-125979 (URN)
Prosjekter
Bygg
Forskningsfinansiär
Linköpings universitet
Merknad

DOI does not work: 10.3850/S201042861410003X

Tilgjengelig fra: 2016-03-10 Laget: 2016-03-10 Sist oppdatert: 2018-07-19
Schedin, S. & Hassan, O. (2014). An integrated learning model in collaboration with industrial partners. In: Proceedings of the 10th International CDIO Conference: . Paper presented at 10th International CDIO Conference, Universitat Politècnica de Catalunya, Barcelona, Spain, June 16-19, 2014. Spain: Universitat Politècnica de Catalunya
Åpne denne publikasjonen i ny fane eller vindu >>An integrated learning model in collaboration with industrial partners
2014 (engelsk)Inngår i: Proceedings of the 10th International CDIO Conference, Spain: Universitat Politècnica de Catalunya , 2014Konferansepaper, Publicerat paper (Fagfellevurdert)
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

sted, utgiver, år, opplag, sider
Spain: Universitat Politècnica de Catalunya, 2014
Emneord
Engineering didactics, Work Integrated Learning, Integrated Learning Experiences, Active Learning
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-108075 (URN)978‐87‐985272‐6‐8 (ISBN)
Konferanse
10th International CDIO Conference, Universitat Politècnica de Catalunya, Barcelona, Spain, June 16-19, 2014
Tilgjengelig fra: 2014-06-25 Laget: 2014-06-25 Sist oppdatert: 2014-08-20
Organisasjoner