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The development of a hybrid racking panel - appraisal of methods for strength and stiffness calculation.

Leitch, Kenneth; Hairstans, Robert

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Abstract

Throughout the U.K, Timber Platform Frame is increasingly being utilized in the high volume, low cost housing market. Here, the client’s desire for fully detached housing often leads to narrow properties with openings concentrated in the shorter wall. This can cause design considerations since the number of full height wall panels deemed to give resistance to racking forces is reduced. In order to achieve the required racking resistance, remedial measures such as the application of additional sheathing, improvement of the sheathing fixity and even the use of steel portal frames, are often employed. Whilst these measures can be considered structurally effective they can also lead to the over specification of materials resulting in a decrease in overall project efficiency. In order to prevent this, research is currently being carried out at Edinburgh Napier University into the development of a series of racking solutions which are optimized in terms of performance, installation and cost.
This paper considers factors influential to racking strength and stiffness such as the degree of fixity between the sheathing and timber frame, nailing intensity and layout and the degree of overturning restraint. A series of racking tests were carried out and the results are used to assess the accuracy of a simplified plastic model for the prediction of racking strength. The paper also highlights the need for a ―stiffness check‖ in order to ensure that structures do not suffer from excessive deflections. A review of an existing analytical model for predicting panel deflection is undertaken and it is found that the method gives acceptable results when predicting the racking strength of imperforate wall panels with varying degrees of overturning restraint. It is also found that estimating the deflection at the wall head based only on the nail slip of the sheathing fastener and the shear deformation of each sheet leads to an overestimation of wall stiffness performance.

Conference Name 11th World Conference on Timber Engineering
Start Date Jun 20, 2010
End Date Jun 24, 2010
Online Publication Date Jun 20, 2010
Publication Date 2010
Deposit Date May 17, 2016
Publicly Available Date May 17, 2016
Peer Reviewed Peer Reviewed
Book Title 11th World Conference on Timber Engineering 2010
ISBN 978-1-62276-175-3
Keywords Hybrid racking panel; development; methods; calculation;
Public URL http://researchrepository.napier.ac.uk/id/eprint/10211
Contract Date May 17, 2016

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