Structural Performance of CLT Shear Walls with Hyperelastic Hold Downs
Publication: Journal of Structural Engineering
Volume 150, Issue 1
Abstract
Cross-laminated timber (CLT) provides a solution for numerous structural applications, including entire seismic force resisting systems. The primary objective of the research presented herein was to develop a CLT shear wall system with hyperelastic elastomeric hold downs (HDs) that provide the required uplift resistance and deformability, so that the CLT panels develop coupled-panel rocking behavior, without strength and stiffness degradation in the HDs. Secondary objectives consisted of the mechanical characterization of the hyperelastic HD as a function of its geometry, and the determination of minimum edge and end distances to avoid brittle failure in the CLT, for development of capacity-based design procedures for this system. To achieve these objectives, the individual components (HDs, steel rods, spline joints, and CLT panels) were tested along with a total of 66 full-scale shear walls. The tests demonstrated that (1) the HDs remain elastic under rocking kinematics provided that the elastic limit of the steel rod is not exceeded, (2) sufficient CLT width can prevent undesired brittle CLT failure before steel yielding in the rods, and (3) the shear wall strength and stiffness is a function of HD size and the panel-to-panel shear connection properties. The hyperelastic HD assembly provides design engineers with a low-damage alternative to contemporary HD solutions for platform-type CLT shear walls.
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Data Availability Statement
Some or all data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research was funded by the Government of British Columbia through a BC Innovate Ignite Grant (No. 2016-SPR-013-UNBC), a Forest Innovation Investment Wood First Grant (No. FII-19/2-057), and a BC Leadership Chair (No. RC14-2962). The support by the UNBC lab technicians James Andal, Michael Billups, and Ryan Stern is greatly appreciated. Materials were provided by Structurlam Mass Timber Corporation (CLT), MTC Solutions (screws), and JVI Inc. (elastomeric bearing pads).
References
ANSI/AWC (American National Standards Institute/American Wood Council). 2021. Special design provisions for wind and seismic (SDPWS). Leesburg, VA: AWC, American Forest and Paper Association.
Asgari, H., T. Tannert, M. M. Ebadi, C. Loss, and M. Popovski. 2021. “Hyperelastic hold-down solution for CLT shear walls.” Constr. Build. Mater. 289 (Jun): 123173. https://doi.org/10.1016/j.conbuildmat.2021.123173.
Asgari, H., T. Tannert, and C. Loss. 2022. “Block tear-out resistance of CLT panels with single large-diameter connectors.” Eur. J. Wood Wood Prod. 80 (4): 805–816. https://doi.org/10.1007/s00107-022-01809-3.
ASTM. 2017. Standard specification for alloy-steel and stainless steel bolting materials for high-temperature service. ASTM A193. West Conshohocken, PA: ASTM.
ASTM. 2019. Standard test methods for cyclic (reversed) load test for shear resistance of vertical elements of the lateral force resisting systems for buildings. ASTM E2126. West Conshohocken, PA: ASTM.
Brandner, R., G. Flatscher, A. Ringhofer, G. Schickhofer, and A. Thiel. 2016. “Cross laminated timber (CLT): Overview and development.” Eur. J. Wood Wood Prod. 74 (May): 331–351. https://doi.org/10.1007/s00107-015-0999-5.
Brown, J. R., M. Li, T. Tannert, and D. Moroder. 2021. “Experimental study on orthogonal joints in cross-laminated timber with self-tapping screws installed with mixed angles.” Eng. Struct. 228 (Feb): 111560. https://doi.org/10.1016/j.engstruct.2020.111560.
Casagrande, D., G. Doudak, L. Mauro, and A. Polastri. 2018. “Analytical approach to establishing the elastic behavior of multipanel CLT shear walls subjected to lateral loads.” J. Struct. Eng. 144 (2): 04017193. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001948.
Ceccotti, A., C. Sandhaas, M. Okabe, M. Yasumura, C. Minowa, and N. Kawai. 2013. “SOFIE project–3D shaking table test on a seven-storey full-scale cross-laminated timber building.” Earthquake Eng. Struct. Dyn. 42 (13): 2003–2021. https://doi.org/10.1002/eqe.2309.
Chen, Z., and M. Popovski. 2019. “Mechanics-based analytical models for balloon-type cross-laminated timber (CLT) shear walls under lateral loads.” Eng. Struct. 28 (Apr): 109916. https://doi.org/10.1016/j.engstruct.2019.109916.
CSA (Canadian Standards Association). 2016. Update 1 engineering design in wood. CSA O86-14. Mississauga, ON, Canada: CSA.
CSA (Canadian Standards Association). 2018. General requirements for rolled or welded structural quality steel. G40.20-13/G40.21-13. Mississauga, ON, Canada: CSA.
CSA (Canadian Standards Association). 2019. Engineering design in wood. CSA O86-19. Mississauga, ON, Canada: CSA.
Dietsch, P., and R. Brandner. 2015. “Self-tapping screws and threaded rods as reinforcement for structural timber elements—A state-of-the-art report.” Constr. Build. Mater. 97 (Oct): 78–89. https://doi.org/10.1016/j.conbuildmat.2015.04.028.
Dires, S., and T. Tannert. 2022. “Performance of coupled CLT shear walls with internal perforated steel plates as vertical joints and hold-down.” Constr. Build. Mater. 346 (Sep): 128389. https://doi.org/10.1016/j.conbuildmat.2022.128389.
Follesa, M., M. Fragiacomo, D. Casagrande, R. Tomasi, M. Piazza, D. Vassallo, D. Canetti, and S. Rossi. 2018. “The new provisions for the seismic design of timber buildings in Europe.” Eng. Struct. 168 (Aug): 736–747. https://doi.org/10.1016/j.engstruct.2018.04.090.
Gavric, I., M. Fragiacomo, and A. Ceccotti. 2015. “Cyclic behaviour of typical metal connectors for cross-laminated (CLT) structures.” Mater. Struct. 48 (Jun): 1841–1857. https://doi.org/10.1617/s11527-014-0278-7.
Harte, A. M. 2017. “Mass timber–the emergence of a modern construction material.” J. Struct. Integrity Maint. 2 (3): 121–132. https://doi.org/10.1080/24705314.2017.1354156.
Hashemi, A., H. Bagheri, S. M. M. Yousef-Beik, F. M. Darani, A. Valadbeigi, P. Zarnani, and P. Quenneville. 2020. “Enhanced seismic performance of timber structures using resilient connections: Full-scale testing and design procedure.” J. Struct. Eng. 146 (9): 04020180. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002749.
Hossain, A., M. Popovski, and T. Tannert. 2018. “Cross-laminated timber connections assembled with a combination of screws in withdrawal and screws in shear.” Eng. Struct. 168 (Aug): 1–11. https://doi.org/10.1016/j.engstruct.2018.04.052.
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.
IBC (International Building Code). 2021. International code council (ICC). Falls Church, VA: IBC.
ISO. 1983. Timber structures—Joints made with mechanical fasteners—General principles for the determination of strength and deformation characteristics. ISO 6891. Geneva: ISO.
Izzi, M., D. Casagrande, S. Bezzi, D. Pasca, M. Follesa, and R. Tomasi. 2018a. “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.
Izzi, M., A. Polastri, and M. Fragiacomo. 2018b. “Investigating the hysteretic behavior of cross-laminated timber wall systems due to connections.” J. Struct. Eng. 144 (4): 04018035. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002022.
Karacabeyli, E., and C. Lum. 2014. Technical guide for the design and construction of tall wood buildings in Canada. Pointe-Claire, QC, Canada: FPInnovations.
Masticord. 1984. Structural bearing pad design guide. 3rd ed. Lincolnwood, IL: JVI.
NBCC (National Building Code of Canada). 2020. Canadian commission on building and fire codes. Ottawa: National Research Council of Canada.
Pei, S., J. W. van de Lindt, A. R. Barbosa, J. W. Berman, E. McDonnell, J. D. Dolan, H.-E. Blomgren, R. B. Zimmerman, D. Huang, and S. Wichman. 2019. “Experimental seismic response of a resilient 2-story mass-timber building with post-tensioned rocking walls.” J. Struct. Eng. 145 (11): 04019120. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002382.
Popovski, M., and I. Gavric. 2016. “Performance of a 2-story CLT house subjected to lateral loads.” J. Struct. Eng. 142 (4): E4015006. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001315.
Schneider, J., T. Tannert, S. Tesfamariam, and S. F. Stiemer. 2018. “Experimental assessment of a novel steel tube connector in cross-laminated timber.” Eng. Struct. 177 (Dec): 283–290. https://doi.org/10.1016/j.engstruct.2018.09.058.
Shahnewaz, M., C. Dickof, and T. Tannert. 2021. “Seismic behavior of balloon frame CLT shear walls with different ledgers.” J. Struct. Eng. 147 (9): 04021137. https://doi.org/10.1061/(ASCE)ST.1943-541X.0003106.
Shahnewaz, M., C. Dickof, and T. Tannert. 2023. “Experimental investigation of the hysteretic behaviour of single-story single- and coupled-panel CLT shear walls with nailed connections.” Eng. Struct. 291 (Sep): 116443. https://doi.org/10.1016/j.engstruct.2023.116443.
Shahnewaz, M., M. Popovski, and T. Tannert. 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.
Smith, I., A. Asiz, M. Snow, and I. Chui. 2006. “Possible Canadian/ISO approach to deriving design values from test data.” In Proc., CIB Working Commission W18. Karlsruhe, Germany: Commercial Banking Company.
Spitz, I. 1978. “The design and behaviour of elastomeric bearing pads.” Civ. Eng. South Afr. 1978 (9): 219–229.
Tannert, T., M. Follesa, M. Fragiacomo, P. González, H. Isoda, D. Moroder, H. Xiong, and J. W. van de Lindt. 2018. “Seismic design of cross-laminated timber buildings.” Wood Fiber Sci. 50 (Aug): 3–26. https://doi.org/10.22382/wfs-2018-037.
Tannert, T., and C. Loss. 2022. “Contemporary and novel hold-down solutions for mass timber shear walls.” Buildings 12 (2): 202. https://doi.org/10.3390/buildings12020202.
Tatar, A., and D. M. Dowden. 2022. “Analytical and numerical investigation of a low-damage uplift friction damper for self-centering cross-laminated timber rocking walls.” Eng. Struct. 254 (Mar): 113836. https://doi.org/10.1016/j.engstruct.2021.113836.
Zhang, X., M. Popovski, and T. Tannert. 2018. “High-capacity hold-down for mass-timber buildings.” Constr. Build. Mater. 164 (Mar): 688–703. https://doi.org/10.1016/j.conbuildmat.2018.01.019.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 1 • January 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 18, 2023
Accepted: Sep 5, 2023
Published online: Oct 31, 2023
Published in print: Jan 1, 2024
Discussion open until: Mar 31, 2024
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