Seismic Behavior of Balloon Frame CLT Shear Walls with Different Ledgers
Publication: Journal of Structural Engineering
Volume 147, Issue 9
Abstract
This paper presents experimental investigations on the seismic behavior of cross laminated timber (CLT) shear walls in a balloon frame configuration with various ledger assemblies attached at midheight. The tested system consisted of two seven-ply 191-mm-thick CLT panels with generic hold-downs, steel angle brackets, plywood surface splines, and nails as fasteners. A 2-story system was tested with a panel aspect ratio of with different steel and wood ledgers under monotonic and quasistatic reversed cyclic loading. Three ledgers were subsequently tested under vertical quasistatic monotonic loading to determine their remaining load-carrying capacity. The tests showed that the shear wall displacement was due to the rocking of the wall panels, which themselves behaved as rigid bodies with negligible in-plane deformations. When compared to the monotonic tests, the strength in reversed cyclic tests was up to 21% lower. The ledger did not impede the desired rocking behavior of the wall, nor did the rocking of the wall reduce the remaining gravity load-carrying capacity of the ledgers by more than 7%. Balloon-framed CLT shear walls can be detailed and designed using the Canadian standard specifications for platform-type construction.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The project was supported by Natural Resources Canada (NRCAN) through the Green Construction through Wood (GCWood) Program. The support by UNBC technicians Michael Billups and Ryan Stern and undergraduate research assistant Anthony Bilodeau is greatly appreciated.
References
ASCE. 2017. Minimum design loads and associated criteria for buildings and other structures. ASCE7-16. Reston, VA: ASCE.
ASSY Kombi. 2020. “Hexagonal head partially threaded self-tapping structural wood screw.” Accessed July 24, 2020. https://mtcsolutions.com.
ASTM. 2011. Standard test methods for cyclic (reversed) load test for shear resistance of walls for buildings. ASTM E2126-11. West Conshohocken, PA: ASTM.
BSI (British Standards Institution). 2004. Eurocode 5: Design of timber structures. Part1 1: General—Common rules and rules for buildings. EN 1995-1-1. London: BSI.
Cavanagh, T. 1997. “Balloon houses: The original aspects of conventional wood-frame construction re-examined.” J. Archit. Educ. 51 (1): 5–15. https://doi.org/10.1080/10464883.1997.10734741.
CEN (European Committee for Standardization). 1991. Timber structures—Joints made with mechanical fasteners—General principles for the determination of strength and deformation characteristics. EN 26891. Brussels, Belgium: CEN.
Chen, Z., and M. Popovski. 2019. “Mechanics-based analytical models for balloon-type cross-laminated timber (CLT) shear walls under lateral loads.” Eng. Struct. 208 (Apr): 109916. https://doi.org/10.1016/j.engstruct.2019.109916.
CrossLam. 2020. “CrossLam CLT technical design guide.” Accessed July 24, 2020. https://www.structurlam.com.
CSA (Canadian Standards Association). 2019. Engineering design in wood. CSA Standard O86-19. Toronto: CSA.
Daneshvar, H., J. Niederwestberg, C. Dickof, J. P. Letarte, and Y. H. Chui. 2019. “Cross-laminated timber shear walls in balloon construction: Seismic performance of steel connections.” In Proc., Modular and Offsite Construction, 405–412. Edmonton, AB, Canada: Univ. of Alberta Library.
Gavric, I., M. Fragiacomo, and A. Cecotti. 2015a. “Cyclic behavior of CLT wall systems: Experimental tests and analytical prediction model.” J. Struct. Eng. 141 (11): 04015034. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001246.
Gavric, I., M. Fragiacomo, and A. Ceccotti. 2015b. “Cyclic behavior of typical screwed connections for cross-laminated (CLT) structures.” Eur. J. Wood Wood Prod. 73 (2): 179–191. https://doi.org/10.1007/s00107-014-0877-6.
Gavric, I., M. Fragiacomo, and A. Ceccotti. 2015c. “Cyclic behaviour of typical metal connectors for cross-laminated (CLT) structures.” Mater. Struct. 48 (6): 1841–1857. https://doi.org/10.1617/s11527-014-0278-7.
Hossain, A., I. Danzig, and T. Tannert. 2016. “Cross-laminated timber shear connection with innovative self-tapping screw assemblies.” J. Struct. Eng. 142 (11): 04016099. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001572.
Hossain, A., M. Popovski, and T. Tannert. 2019. “Group effects for shear connections with self-tapping screws in CLT.” J. Struct. Eng. 145 (8): 04019068. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002357.
ICC (International Code Council). 2021. ICC international building code. Falls Church, VA: ICC.
Izzi, M., D. Casagrande, S. Bezzi, D. Pasca, M. Follesa, and R. Tomasi. 2018. “Seismic behaviour of cross-laminated timber structures: A state-of-the-art review.” Eng. Struct. 170 (Sep): 42–52. https://doi.org/10.1016/j.engstruct.2018.05.060.
Karacabeyli, E., and S. Gagnon. 2019. Cross laminated timber (CLT) handbook. Vancouver, Canada: FPInnovations.
Loss, C., A. Hossain, and T. Tannert. 2018. “Simple cross-laminated timber shear connections with spatially arranged screws.” Eng. Struct. 173 (Oct): 340–356. https://doi.org/10.1016/j.engstruct.2018.07.004.
Mestar, M., G. Doudak, M. Caola, and D. Casagrande. 2020. “Equivalent-frame model for elastic behaviour of cross-laminated timber walls with openings.” Proc. Inst. Civ. Eng. Struct. Build. 173 (5): 363–378. https://doi.org/10.1680/jstbu.19.00057.
NBCC (National Building Code of Canada). 2020a. National building code of Canada 2015, Canadian commission on building and fire codes. Ottawa: National Research Council of Canada.
NBCC (National Building Code of Canada). 2020b. National building code of Canada 2020, Canadian commission on building and fire codes. Ottawa: National Research Council of Canada.
Popovski, M., J. Schneider, and M. Schweinsteiger. 2010. “Lateral load resistance of cross laminated wood panels.” In Proc., World Conf. on Timber Engineering. Riva del Garda, Italy: Univ. of Graz.
Pozza, L., A. Saetta, M. Savoia, and D. Talledo. 2018. “Angle bracket connections for CLT structures: Experimental characterization and numerical modelling.” Constr. Build. Mater. 191 (Dec): 95–113. https://doi.org/10.1016/j.conbuildmat.2018.09.112.
Rothoblass. 2020. “Angle brackets and plates for buildings.” Accessed July 24, 2020. https://www.rothoblaas.com.
Schneider, J., Y. Shen, S. F. Stiemer, and S. Tesfamariam. 2015. “Assessment and comparison of experimental and numerical model studies of cross-laminated timber mechanical connections under cyclic loading.” Constr. Build. Mater. 77 (Feb): 197–212. https://doi.org/10.1016/j.conbuildmat.2014.12.029.
Shahnewaz, Md., M. S. Alam, and T. Tannert. 2018. “In-plane strength and stiffness of cross-laminated timber shear walls.” Buildings 8 (8): 100. https://doi.org/10.3390/buildings8080100.
Shahnewaz, Md., Y. Pan, M. S. Alam, and T. Tannert. 2020a. “Seismic fragility of cross-laminated timber platform buildings.” J. Struct. Eng. 146 (12): 04020256. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002834.
Shahnewaz, Md., T. Tannert, M. S. Alam, and M. Popovski. 2017. “In-plane stiffness of cross laminated timber panels with openings.” Struct. Eng. Int. 27 (2): 217–223. https://doi.org/10.2749/101686617X14881932436131.
Shahnewaz, Md., T. Tannert, and M. Popovski. 2019. “Resistance of cross-laminated timber shear walls for platform-type construction.” J. Struct. Eng. 145 (12): 04019149. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002413.
Shahnewaz, Md., T. Tannert, and M. Popovski. 2020b. “Defection of cross-laminated timber shear walls for platform-type construction.” Eng. Struct. 221 (Oct): 111091. https://doi.org/10.1016/j.engstruct.2020.111091.
Sprague, P. E. 1981. “The origin of balloon framing.” J. Soc. Archit. Historians 40 (4): 311–319. https://doi.org/10.2307/989648.
Sullivan, K., T. H. Miller, and R. Gupta. 2018. “Behavior of cross-laminated timber diaphragm connections with self-tapping screws.” Eng. Struct. 168 (Aug): 505–524. https://doi.org/10.1016/j.engstruct.2018.04.094.
Trutalli, D., L. Marchi, R. Scotta, and L. Pozza. 2019. “Capacity design of traditional and innovative ductile connections for earthquake-resistant CLT structures.” Bull. Earthquake Eng. 17 (4): 2115–2136. https://doi.org/10.1007/s10518-018-00536-6.
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Information
Published In
Journal of Structural Engineering
Volume 147 • Issue 9 • September 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 25, 2021
Accepted: Apr 16, 2021
Published online: Jul 8, 2021
Published in print: Sep 1, 2021
Discussion open until: Dec 8, 2021
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