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Movaffaghi, Hamid
Publications (4 of 4) Show all publications
Movaffaghi, H., Pyykkö, J., Yitmen, I. & Svensson, S. (2019). Large Span Timber Buildings Under Horizontal Forces. In: : . Paper presented at CIVIL-COMP 2019, The Sixteenth International Conference on Civil, Structural and Environmental Engineering Computing 16-19 September 2019, Lake Garda, Italy. Italy: Elsevier, 1
Open this publication in new window or tab >>Large Span Timber Buildings Under Horizontal Forces
2019 (English)Conference paper, Oral presentation with published abstract (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.

Place, publisher, year, edition, pages
Italy: Elsevier, 2019
Keywords
timber concrete composite floor, large span, horizontal forces, low and medium-rise timber structures.
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hj:diva-46378 (URN)
Conference
CIVIL-COMP 2019, The Sixteenth International Conference on Civil, Structural and Environmental Engineering Computing 16-19 September 2019, Lake Garda, Italy
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2019-09-26Bibliographically approved
Movaffaghi, H., Pyykkö, J. & Yitmen, I. (2019). Multi-Objective and Multi-Criteria Approach for Value-Driven Design in Industrialized Residential Multi-Storey Timber-Building. In: Thomas K. Bader, Josef Füssl, Anders Olsson (Ed.), Computational Methods in Wood Mechanics – from Material Properties to Timber Structures.: . Paper presented at Compwood 2019 International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures.ECCOMAS Thematic Conference, June 17-19, 2019, Växjö, Sweden.. Växjö
Open this publication in new window or tab >>Multi-Objective and Multi-Criteria Approach for Value-Driven Design in Industrialized Residential Multi-Storey Timber-Building
2019 (English)In: Computational Methods in Wood Mechanics – from Material Properties to Timber Structures. / [ed] Thomas K. Bader, Josef Füssl, Anders Olsson, Växjö, 2019Conference paper, Oral presentation with published abstract (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. 

Place, publisher, year, edition, pages
Växjö: , 2019
Keywords
Multi-Objective, Multi-Criteria, Value-Driven Design, Industrialized Residential Multi-Storey Timber-Building
National Category
Building Technologies
Identifiers
urn:nbn:se:hj:diva-45574 (URN)open.lnu.se/index.php/compwood (DOI)978-91-88898-64-7 (ISBN)
Conference
Compwood 2019 International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures.ECCOMAS Thematic Conference, June 17-19, 2019, Växjö, Sweden.
Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-19Bibliographically approved
Movaffaghi, H. & Yitmen, I. (2018). 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 construction. In: I. Mutis & T. Hartmann (Ed.), 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. Paper presented at 35th CIB W78 2018 Conference: IT in Design, Construction,and Management, Chicago, 01-03 October 2018. (pp. 447-454). Cham, Switzerland: Springer, 1, Article ID 53.
Open this publication in new window or tab >>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 construction
2018 (English)In: 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, Published 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.

Place, publisher, year, edition, pages
Cham, Switzerland: Springer, 2018
Keywords
LCA, LCC, Multi criteria, Multi-objective, BIM, Timber Structures
National Category
Construction Management
Identifiers
urn:nbn:se:hj:diva-41890 (URN)10.1007/978-3-030-00220-6_53 (DOI)978-3-030-00219-0 (ISBN)978-3-030-00220-6 (ISBN)
Conference
35th CIB W78 2018 Conference: IT in Design, Construction,and Management, Chicago, 01-03 October 2018.
Projects
Multi-criteria analysis for Sustainable Construction Process focusing on climate impact and construction costs
Available from: 2018-10-24 Created: 2018-10-24 Last updated: 2018-11-06Bibliographically approved
Lennartsson, M., Movaffaghi, H. & Linderoth, H. (2018). Exploration of the BIM Development and Application: Identifying Key Areas for the Industrialized House-Building Sector. In: Mela, K., Pajunen, S. and Raasakka, V. (Ed.), Proceedings of the 17th International Conference on Computing in Civil and Building Engineering. 5-7 June 2018, Tampere, Finland.: . Paper presented at 17th International Conference on Computing in Civil and Building Engineering, ICCCBE2018, Tampere, Finland, June 5-7, 2018. (pp. 1030-1037).
Open this publication in new window or tab >>Exploration of the BIM Development and Application: Identifying Key Areas for the Industrialized House-Building Sector
2018 (English)In: Proceedings of the 17th International Conference on Computing in Civil and Building Engineering. 5-7 June 2018, Tampere, Finland. / [ed] Mela, K., Pajunen, S. and Raasakka, V., 2018, p. 1030-1037Conference paper, Published paper (Refereed)
Abstract [en]

Building Information Modelling (BIM) is claimed to transform the Architecture, Engineering and Construction (AEC) industry, whereas current research has argued that diffusion of BIM use proceeds at a slower rate than the optimistic predictions. Much of the research on BIM has focused on the traditional part of the industry and larger companies, whereas less attention has been paid to the industrialized house-builders. The underlying idea of industrialized house-building is to increase efficiency, both internally (do things right) and externally (do the right things), with repetitiveness in production facilities. Previous research indicates that there is a lack of demand for BIM, both internally and externally, and that BIM use is rather determined by an individual’s subjective positive or negative evaluation of BIM, which may be hazardous for industrialized house-builders. However, using BIM in repetitive processes is claimed to have potential to improve the output of industrialized housing building.

Hence, based on this background the aim of the paper is twofold: Firstly, to explore the current state of practice, and perceived constraints and driving forces of BIM-use with respect to industrialized house-building. Secondly; based on the results identify key areas for the continuous development of BIM within this sector of the construction trade. A mixed method approach was employed. To begin with, participant observations were carried out in connection to a regional development project, where managers from a selection of industrialized house-building companies assembled in order to identify key areas for development. Thereafter, interviews with managers in industrialized house-building companies were conducted to describe a state of practice within the industrialized house-building sector. Finally, a survey (n=52) was administered to employees at industrialized house-building companies on the Swedish market.

Deducted from the observations at the meetings, the vast number of different software that are used in a large variety of different processes and the need for integration between BIM and other systems was highlighted. Discussions mostly concerned technical issues that can be explained by the fact that meetings participants were technical and development managers. The interviews gave at hand that better connection between BIM and the Enterprise Resource Planning (ERP) is a topic that should be prioritized. The results from the survey showed that 63 per cent of the respondents have experience from working with BIM. The immediate results show similarities with previous studies of BIM use among mid-sized firms in the traditional building and construction industry regarding use frequency, perceived benefits and constraints, as well as perceived challenges. However, it is concluded that the industrialized house building sector need to adapt BIM aligned to their unique conditions in order to reap benefits, without looking too much at what is going on in the traditional construction industry.

Keywords
Industrialized house-building, Building Information Modelling (BIM), Surveys, adoption
National Category
Construction Management
Identifiers
urn:nbn:se:hj:diva-41553 (URN)
Conference
17th International Conference on Computing in Civil and Building Engineering, ICCCBE2018, Tampere, Finland, June 5-7, 2018.
Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2018-09-24
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