Experimental investigation into the seismic fragility of a commercial glazing system
DOI:
https://doi.org/10.5459/bnzsee.53.3.144-149Abstract
Good seismic performance of glazing systems is essential to maintaining building functionality and limiting repair costs in a post-earthquake scenario. This paper reports on experimental research into the seismic performance of a standard commercial glazing system used in New Zealand. The focus of the research is to provide information not only on the life-safety performance of glazing but also on the serviceability of glazing systems, considering post-earthquake weather-tightness. This paper first describes the experimental testing set-up developed at the University of Canterbury to achieve this, then details the damage observed and finally, fragility functions for different damage states are reported. Leakage of the glazing is seen to initiate at a median storey drift demand of only 0.35%, whereas glass breakage did not occur until a median drift storey demand of 5.0%. The results obtained from this research demonstrate that the life-safety risk posed by modern commercial glazing in earthquakes will typically be low but the serviceability performance, and in particular weather-tightness post-earthquake, should be improved.
References
Dhakal RP (2010). “Damage to Non-Structural Components and Contents in 2010 Darfield Earthquake”. Bulletin of the New Zealand Society of Earthquake Engineering, 43(4): 404-411. https://doi.org/10.5459/bnzsee.43.4.404-411 DOI: https://doi.org/10.5459/bnzsee.43.4.404-411
Baird A, Palermo A and Pampanin S (2011). “Façade damage assessment of multi-storey buildings in the 2011 Christchurch earthquake”. Bulletin of the New Zealand Society of Earthquake Engineering, 44(4): 368-376. https://doi.org/10.5459/bnzsee.44.4.368-376. DOI: https://doi.org/10.5459/bnzsee.44.4.368-376
Stuff (2017). Earthquake: Deaths, major damage after severe 7.5 quake hits Hanmer Springs, tsunami warning issued. http://www.stuff.co.nz (Accessed 14/10/2019)
Valli A (2017). “Record of Discussion from Meeting at University of Canterbury”. University of Canterbury, June 2017.
Thurston SJ and King AB (1992). “Two-Directional Cyclic Racking of Corner Curtain Wall Glazing”. BRANZ Study Report No. 44, BRANZ Ltd, Judgeford, New Zealand.
Lim KYS and King AB (1991). “The Behaviour of External Glazing Systems under Seismic In-Plane Racking”. BRANZ Study Report No. 39, BRANZ Ltd, Judgeford, New Zealand.
Wright PD (1989). “The Development of a Procedure and Rig for Testing the Racking Resistance of Curtain Wall Glazing”. BRANZ Study Report No. 17, BRANZ Ltd, Judgeford, New Zealand.
MBIE (2017). “The Seismic Assessment of Existing Buildings: Technical Guidelines for Engineering Assessments”. Initial Release, Ministry of Business, Innovation and Employment, New Zealand.
Behr RA (2009). “Architectural Glass to Resist Seismic and Extreme Climatic Events”. 1st Edition, Woodhead Publishing, Cambridge, UK, 259pp. DOI: https://doi.org/10.1533/9781845696856
Carradine DN, Kumar A, Fairclough R and Beattie G (2020). “Serviceability fragility functions for New Zealand residential windows”. Bulletin of the New Zealand Society for Earthquake Engineering, 53(3): 137-143. https://doi.org/10.5459/bnzsee.53.3.137-143 DOI: https://doi.org/10.5459/bnzsee.53.3.137-143
O’Brien WC, Memari AM, Kremer PA and Behr RA (2012). “Fragility curves for architectural glass in stick-built glazing systems”. Earthquake Spectra, 28(2): 639-665. https://doi.org/10.1193/1.4000011 DOI: https://doi.org/10.1193/1.4000011
SNZ (2008). "NZS4284:2008: Testing of Building Facades”. Standards New Zealand, Wellington, 36pp.
Van Den Bossche N and Janssens A (2016). “Air-tightness and water-tightness of window frames: Comparison of performance and requirements”. Building and Environment, 110: 129-139. https://doi.org/10.1016/j.buildenv.2016.09.034 DOI: https://doi.org/10.1016/j.buildenv.2016.09.034
SNZ (2008). "NZS4211:2008: Specification for Performance of Windows”. Standards New Zealand, Wellington, 26pp.
FEMA (2007). “FEMA461: Interim Testing Protocols for Determining the Seismic Performance Characteristics of Structural and Nonstructural Components”. Federal Emergency Management Agency, Washington, DC, USA, 113pp.
Porter KA, Kennedy R and Bachman R (2007) “Creating fragility functions for performance based earthquake engineering”. Earthquake Spectra, 23(2): 471-489. https://doi.org/10.1193/1.2720892 DOI: https://doi.org/10.1193/1.2720892
Khakurel S, Yeow TZ, Chen F, Wang Z, Saha SK and Dhakal RP (2019). “Development of cladding contribution functions for seismic loss estimation”. Bulletin of the New Zealand Society for Earthquake Engineering, 52(1): 23-43. https://doi.org/10.5459/bnzsee.52.1.23-43 DOI: https://doi.org/10.5459/bnzsee.52.1.23-43
FEMA (2012). “FEMA P-58.1: Seismic Performance Assessment of Buildings Volume 1 – Methodology”. Federal Emergency Management Agency, Washington, DC, USA, 340pp.
Mosqueda G (2016). “Interior Cold-Framed Steel Framed Gypsum Partition Walls”. Background Document FEMA P-58/BD-3.9.32, Applied Technology Council, Redwood City, CA, 19pp.
Yeow TZ, Sullivan TJ and Elwood KJ (2018). “Evaluation of fragility functions with potential relevance for use in New Zealand”. Bulletin of the New Zealand Society for Earthquake Engineering, 51(3): 127-144. https://doi.org/10.5459/bnzsee.51.3.127-144 DOI: https://doi.org/10.5459/bnzsee.51.3.127-144
Dhakal RP, Pourali A and Saha SK (2016). “Simplified Seismic Loss Functions for Suspended Ceilings and Drywall Partitions”. Bulletin of the New Zealand Society for Earthquake Engineering, 49(1): 64-78. https://doi.org/10.5459/bnzsee.49.1.64-78 DOI: https://doi.org/10.5459/bnzsee.49.1.64-78