Structural Performance of Post-Tensioned CLT Shear Walls with Energy Dissipators
Publication: Journal of Structural Engineering
Volume 146, Issue 4
Abstract
The prestressed-laminated timber (Pres-Lam) system is an innovative low-damage wood-hybrid system that utilizes post-tensioned (PT) mass timber components, e.g., laminated veneer lumber (LVL), glued laminated timber (glulam), and cross laminated timber (CLT), along with various types of energy dissipators, e.g., axial energy dissipators (also called fuses) and U-shaped flexural plates (UFPs). Previous tests carried out on this system focused on scaled (one-third or two-thirds) LVL specimens, whereas limited studies have been conducted on the Pres-Lam system with CLT which has mechanical properties and composition different from LVL. Through comprehensive tests, the lateral-load response of PT-only and Pres-Lam CLT shear walls was investigated in this study. A total of 14 different full-scale PT-only and Pres-Lam CLT walls in four configurations were tested under monotonic and reversed cyclic loading. A user-friendly fuse was designed and adopted in the Pres-Lam CLT wall specimens. PT-only and Pres-Lam CLT shear walls had bilinear elastic and elastic-plastic behavior, respectively, with a stretching point corresponding to the state at which the PT force started to increase. With energy dissipators, Pres-Lam CLT shear walls had higher resistance, maximum lateral drift and energy dissipation compared to PT-only walls. The influence of the initial PT force, the fuse spacing, and the number of UFPs on the stiffness, resistance, maximum lateral drift and energy dissipation of the wall specimens was discussed. The test results also show that the behavior of the Pres-Lam CLT shear walls can be decoupled and a superposition rule can be applied to obtain the stiffness and resistance of such systems. Yielding and buckling of the fuses occurred at the early stage of loading as designed, and localized crushing of wood at the end of panels happened when the lateral drift was at or beyond 2.5%. The test results gave a valuable insight into the structural behavior of the PT-only and Pres-Lam CLT shear walls under in-plane lateral loads.
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Acknowledgments
This project was financially supported by Natural Resources Canada (NRCan) under the Contribution Agreement existing between the Government of Canada and FPInnovations.
References
APA (Engineered Wood Association). 2018. Standard for performance-rated cross-laminated timber. ANSI/APA PRG 320. Tacoma, WA: APA.
ASTM. 2011. 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.
Baird, A., T. Smith, A. Palermo, and S. Pampanin. 2014. “Experimental and numerical study of U-shape flexural plate (UFP) dissipators.” In Proc., 2014 New Zealand Society of Earthquake Engineering Annual Conf. Wellington, New Zealand: New Zealand Society for Earthquake Engineering.
CEN (European Committee for Standardization). 2012. Timber structures—Structural timber and glued laminated timber—Determination of some physical and mechanical properties. EN 408. Brussels, Belgium: CEN.
CERC (Canterbury Earthquakes Royal Commission). 2012. Vol. 3 of Low-damage building technologies. Final Rep. Christchurch, New Zealand: CERC.
Chen, Z., C. Ni, C. Dagenais, and S. Kuan. Forthcoming. “A temperature-dependent plastic-damage constitutive model, WoodST, for numerical simulation of wood-based materials and connections.” J. Struct. Eng. 146 (3): 04019225. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002524.
Chen, Z., and M. Popovski. 2019a. “Experimental analysis and numerical modelling of post-tensioned CLT shear walls with energy dissipators.” In Proc., CompWood 2019 Conf. Växjö, Sweden: Linnaeus Univ.
Chen, Z., and M. Popovski. 2019b. Solutions for upper mid-rise and high-rise mass timber construction: Numerical models for post-tensioned shear wall system with energy dissipators. Vancouver, BC, Canada: FPInnovations.
Chen, Z., M. Popovski, and P. Symons. 2018. Advanced wood-based solutions for mid-rise and high-rise construction: Structural performance of post-tensioned CLT shear walls with energy dissipators. Vancouver, BC, Canada: FPInnovations.
Chen, Z., E. Zhu, F. Lam, and J. Pan. 2014. “Structural performance of Dou-Gong brackets of Yingxian Wood Pagoda under vertical load—An experimental study.” Eng. Struct. 80: 274–288. https://doi.org/10.1016/j.engstruct.2014.09.013.
CSA (Canadian Standard Association). 2016. Engineering design in wood. CSA O86. Rexdale, ON, Canada: CSA.
Ganey, R., J. Berman, T. Akbas, S. Loftus, D. Dolan, R. Sause, J. Ricles, S. Pei, J. van de Lindt, and H. Blomgren. 2017. “Experimental investigation of self-centering cross-laminated timber walls.” J. Struct. Eng. 143 (10). https://doi.org/10.1061/(ASCE)ST.1943-541X.0001877.
Ho, T., T. Dao, S. Aaleti, J. van de Lindt, and D. Rammer. 2017. “Hybrid system of unbonded post-tensioned CLT panels and light-frame wood shear walls.” J. Struct. Eng. 143 (2). https://doi.org/10.1061/(ASCE)ST.1943-541X.0001665.
Iqbal, A. 2011. “Seismic response and design of subassemblies for multi-storey prestressed timber buildings.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Canterbury.
Iqbal, A., S. Pampanin, A. Palermo, and A. Buchanan. 2015. “Performance and design of LVL walls coupled with UFP dissipaters.” J. Earthquake Eng. 19 (3): 383–409. https://doi.org/10.1080/13632469.2014.987406.
Iqbal, A., T. Smith, S. Pampanin, M. Fragiacomo, A. Palermo, and A. Buchanan. 2016. “Experimental performance and structural analysis of plywood-coupled LVL walls.” J. Struct. Eng. 142 (2): 04015123. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001383.
Loock, P. 2005. LVL wall with varied external dissipation options. Christchurch, New Zealand: Univ. of Canterbury.
Marriott, D. 2009. “The development of high-performance post-tensioned rocking systems for the seismic design of structures.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Canterbury.
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 (Jul): 639–654. https://doi.org/10.1016/j.engstruct.2018.02.075.
Munoz, W., M. Mohammad, A. Salenikovich, and P. Quenneville. 2008. “Determination of yield point and ductility of timber assemblies: In search for a harmonised approach.” In Proc., 10th World Conf. on Timber Engineering 2008. Tacoma, WA: Engineered Wood Products Association.
Newcombe, M. 2011. “Seismic design of post-tensioned timber frame and wall buildings.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Canterbury.
Newcombe, M. S. P., and A. Buchanan. 2010. “Experimental testing of a two-storey post-tensioned timber building.” In Proc., 9th U.S. National & 10th Canadian Conf. on Earthquake Engineering. Oakland, CA: Earthquake Engineering Research Institute.
Palermo, A., S. Pampanin, and A. Buchanan. 2006. “Experimental investigations on LVL seismic resistant wall and frame subassemblies.” In Proc., 1st European Conf. on Earthquake Engineering and Seismology. Istanbul, Turkey: European Association for Earthquake Engineering.
Palermo, A., S. Pampanin, A. Buchanan, and M. Newcombe. 2005. “Seismic design of multi-storey buildings using laminated veneer lumber (LVL).” In Proc., New Zealand Society of Earthquake Engineering, Annual Conf. Wellington, New Zealand: New Zealand Society for Earthquake Engineering.
Pampanin, S., A. Palermo, and A. Buchanan. 2013a. Post-tensioned timber buildings—Part 1 overview. Christchurch, New Zealand: Structural Timber Innovation Company.
Pampanin, S., A. Palermo, and A. Buchanan. 2013b. Post-tensioned timber buildings—Part 2 seismic design. Christchurch, New Zealand: Structural Timber Innovation Company.
Pei, S., J. van de Lindt, A. Barbosa, J. Berman, H. Blomgren, J. Dolan, E. McDonnell, R. Zimmerman, M. Fragiacomo, and D. Rammer. 2018. “Full-scale shake table test of a two-storey mass-timber building with resilient rocking walls.” In Proc., 16th European Conf. on Earthquake Engineering. Skopje, North Macedonia: European Association for Earthquake Engineering.
Pilon, S., A. Palermo, F. Sarti, and A. Salenikovich. 2019. “Benefits of multiple rocking segments for CLT and LVL Pres-Lam wall systems.” Soil Dyn. Earthquake Eng. 117 (Feb): 234–244. https://doi.org/10.1016/j.soildyn.2018.11.026.
Popovski, M. 2017. Introduction of post-tensioned Pres-Lam system. Vancouver, BC, Canada: FPInnovations.
Popovski, M., and E. Karacabeyli. 2017. Strategy for implementing Pres-Lam system in Canada and the US. Vancouver, BC, Canada: FPInnovations.
Rothoblaas. 2018. Canadian structural design guide. Ottawa: National Research Council Canada.
Sarti, F. 2015. “Seismic design of low-damage post-tensioned timber wall systems.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of Canterbury.
Sarti, F., A. Palermo, and S. Pampanin. 2016a. “Development and testing of an alternative dissipative posttensioned rocking timber wall with boundary columns.” J. Struct. Eng. 142 (4): E4015011. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001390.
Sarti, F., A. Palermo, and S. Pampanin. 2016b. “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.
Smith, T. 2006. LVL rocking shear walls: With external dissipater attachment. Christchurch, New Zealand, Univ. of Canterbury.
Smith, T. 2016. Research survey: Pres-Lam technology. Christchurch, New Zealand: PTL Structural Timber Consultants.
Smith, T., M. Fragiacomo, S. Pampanin, and A. Buchanan. 2009. “Construction time and cost for post-tensioned timber buildings.” Proc. Inst. Civ. Eng. Constr. Mater. 162 (4): 141–149. https://doi.org/10.1680/coma.2009.162.4.141.
Smith, T., F. Ponzo, A. Di Cesare, S. Pampanin, D. Carradine, A. Buchanan, and D. Nigro. 2014. “Post-tensioned glulam beam-column joints with advanced damping systems: Testing and numerical analysis.” J. Earthquake Eng. 18 (1): 147–167. https://doi.org/10.1080/13632469.2013.835291.
Wu, K., A. Iqbal, and M. Popovski. 2018. “Experimental study of post-tensioned CLT wall systems.” In Proc., 15th World Conf. on Timber Engineering (WCTE). Seo-Gu, Daejeon, Republic of Korea: Korea Forest Service.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 26, 2018
Accepted: Sep 3, 2019
Published online: Jan 31, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 30, 2020
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