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![Figure 4: Framing station (courtesy of ACQBUILT, Inc.) [2] components...](profile/Md-Islam-1133/publication/361424764/figure/fig3/AS:1169116144640005@1655750418637/Framing-station-courtesy-of-ACQBUILT-Inc-2-components-are-assembled-at-the-site-the_Q320.jpg)
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Panelized fabrication of light-frame wood building has higher productivity than the traditional stick-built method. However, the roof production process is not very efficient due to the structural system and construction method. A new holistic approach for the roof structure is developed to improve the productivity of the panelized construction pro...
Contexts in source publication
Context 1
... Hei Chui, University of Alberta, Canada, yhc@ualberta.ca 2 Mohammed Sadiq Altaf, ACQBUILT Inc., Canada, sadiqa@acqbuilt.com In summary, current roof production in panelized construction method has the following 5 key steps and involves 19 manual-tasks as illustrated in Figure 2: ...
Context 2
... roof is designed to support 1.0 kPa live load with a dead and snow load of 1.0 kPa and 1.65 kPa, respectively. The following hypothesis was adopted for the gravity load distribution from the roof panels to the support wall: a) as shown in Figure 12 from panel A full load is transferred to the support wall, b) half of the load is transferred from panel B to the support wall. ...
Context 3
... 4 summarizes the calculated connection capacities using the above-mentioned model and compares them with experimental yield, ultimate load values and the failure mode of the connection. It was observed that the failure mode in the test and calculated from the model was similar: two plastic hinges per share plane and fastener ( Figure 23). Overall, it can be concluded that the proposed model by Bejtka and Blaß [5] performs reasonably well in predicting the connection strength of the Support wall to Panel-B wedge connection. ...
Citations
... Moreover, transporting the roof volumetric units requires a relatively large number of trailers (to be specific, in the case of an Alberta-based home manufacturer, four trailers are required to transport a 1600 sq ft single-family home) and on-site loading and unloading of trusses increases the overall work duration [9]. Therefore, to improve the current roof construction a holistic approach was developed by Islam et al. [10,11]. In this holistic approach, a gable roof was divided into several sub-elements. ...
... The complete the panelized roof system for a typical two-storey house with a gable roof comprises the following components ( Figure 2): (a) Roof panels, (b) support wall panels, (c) celling frames, (d) beams spanning over two support walls, (e) gable ends, and (f) inter-component connections, including the inclined roof panel-to-support wall, ceiling frame-to-load-bearing shear wall, apex connection, and the support wall-to-ceiling frame. Due to panelization, major components, such as roof panels, ceiling frames and support walls, can be produced in the automated and semi-automated production line of an offsite facility [10]. For instance, the roof panels (panel-A and panel-B in Figure 2) and support walls are produced using LSL and OSB in the wall production line. ...
Panelized fabrication of light-frame wood buildings has higher productivity than the traditional stick-built method. However, the roof production process is not very efficient due to the structural system and construction method. This study proposes a novel apex connection that allows for a folding mechanism in a panelized light wood frame roof system. Proof of concept of the proposed connection assembly is presented by a 3D printout of the developed connection. Following the steel design code and timber code, the initial estimation of different parameters, such as the pinhole diameter and number screws, were established. A detailed finite element analysis (FEA) was performed to determine the connection strength requirement for different load case scenarios. The results of the FEA and 3D printout of the assembly show that the proposed connection can provide the required folding mechanism before roof installation and can withstand the load in the unfolding state at service.
... Whereas the ceiling frames are produced in the floor line using wood I-joists. Details of the panel and ceiling frame design are discussed in Islam et al. [5,6]. In brief, the production process of the roof panels is the same as the wall production; for example, the framing operation is performed in the framing station ( Figure 1a) and attaching the OSB to the finished frame is completed in the multifunction bridge (Figure 1b) of the wall line. ...
This paper presents the results of an experimental study on the short-term mechanical performance of timber screw connections comprising two types of fasteners suitable for a novel panelized roof design process. Thirty-seven specimens of five different connection configurations were tested under quasi-static monotonic loading. The main objective of this study is to provide a preliminary assessment of connection capacity that is key to the successful implementation of a proposed panelized roof design method. It also provides the basis to assist in the development of a numerical model of the novel roof assembly. Additionally, the experimental data are used to check the validity of existing analytical approaches for predicting the strengths of screwed connections comprising engineered wood members. The validation exercise shows that available analytical models can be used to predict the connection capacity of the novel panelized roof.
It is common in the building sector to require that several variants of a planned building be developed. Evaluation of such variant solutions can refer to different aspects, but in compliance with the binding EU legal regulations, it is obligatory to take into consideration different stages in the life cycle of a building in any such assessment. As recommended, the evaluation of a life cycle should include three basic aspects, that is costs and the impact on the social and natural environment. It can encompass the development of an entire building, or in other cases it might be justified to analyse particular components of a development project. This article presents an approach to the evaluation of variants of a design for a roof to cover a production hall, with different materials used for a roof truss, such as steel, solid wood and glulam. The evaluation was performed with the Indicator Method, which takes into account also negative values, and the analysis was based on selected indicators pertaining to all stages in the life cycle of the building object. Results of the assessment showed that a solid wood truss is the best solution in terms of the impact on the natural environment. The evaluation inclusive of negative values proved to be helpful in diagnosing critical stages in the life cycle of the object connected with the preparation and production of construction industry products. The employed research methodology confirmed that assessments including the option of assigning negative values are better at making evaluations of the impact of building structures on the environment.
