Cyclic Testing of High-Capacity CLT Shear Walls
Publication: Journal of Structural Engineering
Volume 149, Issue 11
Abstract
Conventional cross-laminated timber (CLT) shear walls often use commercial hold-downs and shear brackets with small-diameter fasteners that limit their lateral capacities. By using higher capacity hold-down connections with large diameter dowels, bolts, or mixed angle screws, a CLT shear wall’s strength and stiffness can be significantly improved. This experimental study assessed the performance of CLT shear walls using high-capacity hold-down and shear key connections. A total of six full-scale, five-ply cantilever CLT shear walls were cyclically tested to evaluate their strength, stiffness, and hysteretic behavior. The specimens had three height-to-width aspect ratios (0.52, 1.3, and 3.3) and two hold-down fastener types (bolts and mixed angle screws). All six wall specimens exhibited significantly higher strength and initial stiffness when compared to previously tested conventional CLT shear walls. Four of the six specimens exhibited ductile behavior through yielding of their hold-down fasteners. However, the two long walls buckled prematurely, highlighting a possible failure mode for CLT shear walls with significant in-plane loading. A maximum system overstrength factor of 2.0 was observed for the walls with mixed angle screw hold-downs, and the overstrength values reduced with increasing aspect ratios. The three walls with bolted hold-downs were not tested to failure due to the longest wall buckling and the other two specimens reaching the test setup’s maximum allowable drifts of 4.5% and 6.0% for the 2.6 m–tall and 6.6 m–tall walls, respectively. Although post peak behavior was not reached, high local ductility demands of 14 and 21 were observed in the bolted connections. Therefore, their ultimate overstrength factors were not found, but the test results indicate an overstrength of 2.7 or greater can occur due to significant “rope effect” of the bolts and their excellent local ductility capacity.
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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 authors gratefully acknowledge the funding for this research from the NZ WIDE Trust, Specialty Wood Products Partnership (SWP), and the Earthquake Commission (EQC) biennial Grant (Project No. 20786). The experimental work was made possible with the technical support of the laboratory technicians at the University of Canterbury’s Structural Engineering Laboratory: Alan Thirlwell, Matthew Robinson, Norman King, Michael Weavers, David Carney, and Alex Lowings.
References
American Wood Council. 2021. Special design provisions for wind and seismic. Washington, DC: American National Standards Institute.
Amini, M. 2018. “Determination of seismic performance factors for cross laminated timber shear wall system based on FEMA P695 methodology.” Ph.D. thesis, Dept. of Civil and Environmental Engineering, Colorado State Univ.
Amini, M. O., J. W. van de Lindt, D. Rammer, and S. Pei. 2021. “Rocking behavior of high-aspect-ratio cross-laminated timber shear walls: Experimental and numerical investigation.” J. Archit. Eng. 27 (3): 04021013. https://doi.org/10.1061/(ASCE)AE.1943-5568.0000473.
APA (The Engineered Wood Association). 2018. Standard for performance-rated cross-laminated timber. ANSI/APA PRG 320-2018. Tacoma, WA: APA.
ASCE. 2021. Minimum design loads and associated criteria for buildings and other structures. ASCE 7-22. Reston, VA: ASCE.
Brandner, R., G. Flatscher, A. Ringhofer, G. Schickhofer, and A. Thiel. 2016. “Cross laminated timber (CLT): Overview and development.” Eur. J. Wood Prod. 74 (3): 331–351. https://doi.org/10.1007/s00107-015-0999-5.
Brown, J. R., and M. Li. 2021. “Structural performance of dowelled cross-laminated timber hold-down connections with increased row spacing and end distance.” Constr. Build. Mater. 271 (Feb): 121595. https://doi.org/10.1016/j.conbuildmat.2020.121595.
Brown, J. R., M. Li, and F. Sarti. 2021. “Structural performance of CLT shear connections with castellations and angle brackets.” Eng. Struct. 240 (Mar): 112346. https://doi.org/10.1016/j.engstruct.2021.112346.
Casagrande, D., S. Rossi, T. Sartori, and R. Tomasi. 2016. “Proposal of an analytical procedure and a simplified numerical model for elastic response of single-storey timber shear-walls.” Constr. Build. Mater. 102 (Mar): 1101–1112. https://doi.org/10.1016/j.conbuildmat.2014.12.114.
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: 3D shaking table test on a seven-storey full-scale X-lam building.” Earthquake Eng. Struct. Dyn. 42 (13): 2003–2021. https://doi.org/10.1002/eqe.2309.
CEN (European Committee for Standardization). 2001. Timber structures—Test methods—Cyclic testing of joints made with mechanical fasteners. EN 12512:2001. Brussels, Belgium: CEN.
CEN (European Committee for Standardization). 2003. Design of timber structures—Part 1-1: General—Common rules and rules for buildings. Brussels, Belgium: CEN.
CEN (European Committee for Standardization). 2016. Structural timber—Strength classes. EN 338. Brussels, Belgium: CEN.
Chopra, A. K. 2012. Dynamics of structures—Theory and applications to earthquake engineering. Berkeley, CA: Prentice Hall.
Computers & Structures, Inc. 2022. SAP2000 Ultimate 64-bit. Berkeley, CA: Computers & Structures.
CSA (Canada Standards Association). 2019. Engineering design in wood. Toronto: CSA.
Dong, W., M. Li, L.-M. Ottenhaus, and H. Lim. 2020. “Ductility and overstrength of nailed CLT hold-down connections.” Eng. Struct. 215 (Aug): 110667. https://doi.org/10.1016/j.engstruct.2020.110667.
Dujic, B., S. Klobčar, and R. Žarnić. 2006. “Influence of openings on shear capacity of massive cross-laminated wooden walls.” NZ Timber Design J. 16 (1): 5–17.
Faggiano, B., et al. 2022. “The Italian instructions for the design, execution and control of timber constructions (CNR-DT 206 R1/2018).” Eng. Struct. 253 (Aug): 113753. https://doi.org/10.1016/j.engstruct.2021.113753.
Flatscher, G., K. Bratulic, and G. Schickhofer. 2015. “Experimental tests on cross-laminated timber joints and walls.” Proc. Inst. Civ. Eng. Struct. Build. 168 (11): 868–877. https://doi.org/10.1680/stbu.13.00085.
FP Innovations. 2019. Canadian CLT handbook. Pointe-Claire, Canada: FP Innovations.
Ganey, R., J. Berman, T. Akbas, S. Loftus, J. Daniel Dolan, R. Sause, J. Ricles, S. Pei, J. van de Lindt, and H.-E. Blomgren. 2017. “Experimental investigation of self-centering cross-laminated timber walls.” J. Struct. Eng. 143 (10): 04017135. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001877.
Gavric, I., M. Fragiacomo, and A. Ceccotti. 2015. “Cyclic behavior of CLT wall systems: Experimental tests and analytical prediction models.” J. Struct. Eng. 141 (11): 04015034. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001246.
Hummel, J., W. Seim, G. Flatscher, and G. Schickhofer. 2013. CLT wall elements under cyclic loading—Details for anchorage and connection, 15. Brussels, Belgium: Cost Action FP1004.
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 (Jan): 42–52. https://doi.org/10.1016/j.engstruct.2018.05.060.
Johansen, K. W. 1949. Theory of timber connections. Bern, Switzerland: International Association of Bridge and Structural Engineering.
Krawinkler, H., F. Parisi, L. Ibarra, A. Ayoub, and R. Medina. 2001. Development of a testing protocol for woodframe structures. Kuala Lumpur, Malaysia: CUREE.
Lam, F., M. Gehloff, and M. Closen. 2010. “Moment-resisting bolted timber connections.” Proc. Inst. Civ. Eng. Struct. Build. 163 (4): 267–274. https://doi.org/10.1680/stbu.2010.163.4.267.
Lauriola, M. P., and C. Sandhaas. 2006. “Quasi-static and pseudo-dynamic tests on XLAM walls and buildings.” In Proc., Int. Workshop on Earthquake Engineering on Timber Structures. Brussels, Belgium: Cost Association.
Li, Z., X. Wang, and M. He. 2022. “Experimental and analytical investigations into lateral performance of cross-laminated timber (CLT) shear walls with different construction methods.” J. Earthquake Eng. 26 (7): 3724–3746. https://doi.org/10.1080/13632469.2020.1815609.
Liu, J., and F. Lam. 2018. “Experimental test of coupling effect on CLT angle bracket connections.” Eng. Struct. 171 (Feb): 862–873. https://doi.org/10.1016/j.engstruct.2018.05.013.
Lukacs, I., A. Björnfot, and R. Tomasi. 2019. “Strength and stiffness of cross-laminated timber (CLT) shear walls: State-of-the-art of analytical approaches.” Eng. Struct. 178 (Aug): 136–147. https://doi.org/10.1016/j.engstruct.2018.05.126.
Moroder, D., T. Smith, A. Dunbar, S. Pampanin, and A. Buchanan. 2018. “Seismic testing of post-tensioned Pres-Lam core walls using cross laminated timber.” Eng. Struct. 167 (Mar): 639–654. https://doi.org/10.1016/j.engstruct.2018.02.075.
National Research Council of Canada. 2022. National building code of Canada: 2020. Ottawa: National Research Council of Canada. https://doi.org/10.4224/W324-HV93.
New Zealand Standard. 2005. Timber structures standard. NZS 3603:1993. Wellington, NewZealand: New Zealand Standard.
New Zealand Standard. 2016. Structural design action, part 5: Earthquake actions—New Zealand. Wellington, New Zealand: Standards New Zealand.
Okabe, M., M. Yasumura, K. Kobayashi, T. Haramiishi, Y. Nakashima, and F. Kazuhiko. 2012. Effect of vertical load under cyclic lateral load test for evaluating sugi CLT wall panel. Auckland, New Zealand: World Conference on Timber Engineering.
Ottenhaus, L.-M., M. Li, and T. Smith. 2018a. “Structural performance of large-scale dowelled CLT connections under monotonic and cyclic loading.” Eng. Struct. 176 (Aug): 41–48. https://doi.org/10.1016/j.engstruct.2018.09.002.
Ottenhaus, L.-M., M. Li, T. Smith, and P. Quenneville. 2018b. “Mode cross-over and ductility of dowelled LVL and CLT connections under monotonic and cyclic loading.” J. Struct. Eng. 144 (7): 04018074. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002074.
Paulay, T., and M. J. N. Priestley. 1992. Seismic design of reinforced concrete and masonry buildings. New York: Wiley.
Pei, S., J. W. van de Lindt, A. R. Barbosa, J. W. Berman, E. McDonnell, J. Daniel 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.
Pei, S., J. W. van de Lindt, M. Popovski, J. W. Berman, J. D. Dolan, J. Ricles, R. Sause, H. Blomgren, and D. R. Rammer. 2016. “Cross-laminated timber for seismic regions: Progress and challenges for research and implementation.” J. Struct. Eng. 142 (4): E2514001. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001192.
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.
Popovski, M., and E. Karacabeyli. 2012. Seismic behaviour of cross-laminated timber structures. Auckland, New Zealand: World Conference on Timber Engineering.
Pozza, L., R. Scotta, D. Trutalli, A. Polastri, and I. Smith. 2016. “Experimentally based q-factor estimation of cross-laminated timber walls.” Proc. Inst. Civ. Eng. Struct. Build. 169 (7): 492–507. https://doi.org/10.1680/jstbu.15.00009.
Rothoblaas. 2020. Plates and connectors for timber. Cortaccia, Italy: Rothoblaas.
Sarti, F., A. Palermo, and S. Pampanin. 2016. “Quasi-static cyclic testing of two-thirds scale unbonded posttensioned rocking dissipative timber walls.” J. Struct. Eng. 142 (4): E4015005. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001291.
Schickhofer, G., and A. Ringhofer. 2012. The seismic behaviour of buildings erected in solid timber construction—Seismic design according to EN 1998 for a 5-storey reference building in CLT. Graz, Austria: Stora Enso.
Seim, W., J. Hummel, and T. Vogt. 2014. “Earthquake design of timber structures—Remarks on force-based design procedures for different wall systems.” Eng. Struct. 76 (Jun): 124–137. https://doi.org/10.1016/j.engstruct.2014.06.037.
Simpson Strong-Tie. 2020. Connectors & fasteners for mass timber construction. Pleasanton, CA: Simpson Strong-Tie.
SPAX International. 2017. European technical approval ETA-12/0114. Copenhagen, Denmark: EOTA.
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.
Wright, T. D. W., M. Li, D. Moroder, and D. Carradine. 2021. “Cyclic behaviour of hold-downs using mixed angle self-tapping screws in Douglas-fir CLT.” In Proc., New Zealand Society for Earthquake Engineering 2021 Annual Conf. Christchurch, New Zealand: New Zealand Society for Earthquake Engineering.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Oct 26, 2022
Accepted: Mar 9, 2023
Published online: Aug 28, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 28, 2024
ASCE Technical Topics:
- Bolted connections
- Bolts
- Connections (structural)
- Construction engineering
- Construction methods
- Engineering fundamentals
- Fastening
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Shear strength
- Shear tests
- Shear walls
- Stiffening
- Strength of materials
- Structural behavior
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
- Walls
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Cited by
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