Experimental studies on in-plane performance of plasterboard sheathed ceiling diaphragms

Abstract

The ultimate goal of this study is to develop a model representing the in-plane behaviour of plasterboard ceiling diaphragms, as part of the efforts towards performance-based seismic engineering of low-rise light timber-framed (LTF) residential buildings in New Zealand (NZ).

LTF residential buildings in NZ are constructed according to a prescriptive standard – NZS 3604 Timber-framed buildings [1]. With regards to seismic resisting systems, LTF buildings constructed to NZS3604 often have irregular bracing arrangements within a floor plan. A damage survey of LTF buildings after the Canterbury earthquake revealed that structural irregularity (irregular bracing arrangement within a plan) significantly exacerbated the earthquake damage to LTF buildings. When a building has irregular bracing arrangements, the building will have not only translational deflections but also a torsional response in earthquakes. How effectively the induced torsion can be resolved depends on the stiffness of the floors/roof diaphragms. Ceiling and floor diaphragms in LTF buildings in NZ have different construction details from the rest of the world and there appears to be no information available on timber diaphragms typical of NZ practice.

This paper presents experimental studies undertaken on plasterboard ceiling diaphragms as typical of NZ residential practice. Based on the test results, a mathematical model simulating the in-plane stiffness of plasterboard ceiling diaphragms was developed, and the developed model has a similar format to that of plasterboard bracing wall elements presented in an accompany paper by Liu [2]. With these two models, three-dimensional non-linear push-over studies of LTF buildings can be undertaken to calculate seismic performance of irregular LTF buildings.

References

Standards New Zealand (2011). “NZS 3604 Timber-framed Buildings”. Standards New Zealand, Wellington.

Liu A and Carradine D (2019). “Seismic Bracing Performance of Plasterboard Timber Walls”. Bulletin of the NZ Society for Earthquake Engineering, 52(2): 56-66, DOI: 10.5459/bnzsee.52.2.56-66. DOI: https://doi.org/10.5459/bnzsee.52.2.56-66

Liu A and Beattie G (2012). “Influence of Stiffness Variation on the Performance of Houses in Earthquakes”. Proceedings of the 2012 NZSEE Annual Conference, Christchurch, NZ, 13-15 April, Paper 113.

Shelton R (2013). “Engineering Basis of NZS 3604”. BRANZ Ltd, Judgeford, NZ. http://www.branz.co.nz/Engineering_Basis_of_NZS_3604

Liu A (2017). ”The Need for a Systematic Approach in Damage Control Design for Light Timber-Framed Buildings in Earthquakes”. Proceedings of the 16th World Conference on Earthquake Engineering, Santiago, Chile, 9th - 13th January, Paper N° 1279.

Canterbury Earthquakes Royal Commission. (2012). “Final Report: Volume 2: The Performance of Christchurch CBD Buildings”. https://canterbury.royalcommission.govt.nz/vwluResources/FinalReportVol2Print/$file/Final_Report_Volume_2_Web.pdf

Carradine DM, Dolan JD and Butt JW (2004). “Effect of Load and Construction on Cyclic Stiffness of Wood Diaphragms”. Proceedings of the World Conference on Timber Engineering, Lahti, Finland, 14-17 June, 6p.

Kirkham WJ, Miller TH and Gupta R (2016). “Practical Analysis for Horizontal Diaphragm Design of Wood-Frame Single-Family Dwellings”. Practice Periodical on Structural Design and Construction, 21(1): 04015005.

Lucksiri K, Miller T, Gupta R, Pei S and van den Lindt J (2012). “Effect of plan configuration on seismic performance of single-storey wood-frame dwellings”. Natural Hazards Review, 13(1): 24–33. DOI: https://doi.org/10.1061/(ASCE)NH.1527-6996.0000061

Saifullah I (2016). “Performance of Ceiling Diaphragms in Steel-Framed Domestic Structures Subjected to Wind Loading”. PhD Thesis, Swinburne University of Technology, Hawthorn, Australia.

Liu A and Shelton R (2018). “Seismic Effects of Structural Irregularity of Light Timber-framed Buildings”. BRANZ Study Report SR404, BRANZ Ltd, Judgeford, NZ.

Shelton R (2004). “Diaphragms for timber framed buildings”. SESOC Journal, 17(1): 16–23.

WWB (2014). “GIB Site Guide”. Winstone Wallboards Limited, Auckland, NZ, 111p.

Thurston S (1993). “Report on Racking Resistance of Long Sheathed Timber Framed Walls with Openings”. BRANZ Study Report SR54. BRANZ Ltd, Judgeford, NZ.

Sinha A and Gupta R (2009). “Strain Distribution in OSB and GWB in Wood-Frame Shear Walls”. Journal of Structural Engineering, 135(6): 666-675. DOI: https://doi.org/10.1061/(ASCE)0733-9445(2009)135:6(666)

NZS3603 (1993). “Timber Structures Standard”. Standards New Zealand, Wellington, NZ.

Saifullah I, Gad E, Shahi R and Watson K (2016). “Structural behaviour of ceiling diaphragms in steel-framed residential structures”. Proceedings of the Australasian Structural Engineering Conference: ASEC 2016, Brisbane, Australia, 22–25 November.

Dowrick DJ and Smith PC (1986). “Timber Sheathed Wall for Seismic and Wind Resistance”. Bulletin of the NZ National Society for Earthquake Engineering, 19(2): 123-134. DOI: https://doi.org/10.5459/bnzsee.19.2.123-134

Kamiya F (1990). “Horizontal plywood sheathed diaphragms with openings: Static loading tests and analysis”. Proceedings, of the 1990 International Timber Engineering Conference, Tokyo, Japan.

Moroder D (2016). “Floor Diaphragms in Multi-Storey Timber Buildings”. PhD Thesis, University of Canterbury, Christchurch, NZ.

Published
2019-06-30
How to Cite
Liu, A., Li, M., & Shelton, R. (2019). Experimental studies on in-plane performance of plasterboard sheathed ceiling diaphragms. Bulletin of the New Zealand Society for Earthquake Engineering, 52(2), 95-106. https://doi.org/10.5459/bnzsee.52.2.95-106
Section
Articles