CLT Shear Walls Anchored with Shear-Tension Angle Brackets: Experimental Tests and Finite-Element Modeling
Publication: Journal of Structural Engineering
Volume 147, Issue 7
Abstract
Due to the high in-plane stiffness and strength capacity of cross-laminated timber (CLT) panels, the mechanical behavior of CLT shear walls is mainly influenced by the mechanical performances of the connections. Several calculation models have been proposed considering the mechanical anchors effectiveness only along their primary direction. However, recent studies showed a relatively high stiffness and capacity of new typologies of angle brackets when subjected to uplift vertical loads, such as for the wall-to-floor Titan V (TTV) angle bracket, developed to obtain high mechanical performances along both the vertical-tensile and horizontal-shear direction. In this paper a study on CLT shear walls anchored with TTV angle bracket is presented. The aim of the work is to investigate the effects of the coupled shear-tension behavior of the connections at the wall level and the effectiveness of TTV as an alternative to traditional mechanical anchors. The paper presents results from full-scale experimental tests and finite-element (FE) numerical analyses in SAP2000, where an innovative macroelement has been developed to model the TTV coupled shear-tension behavior. The effects of the plastic load redistributions of the TTV angle bracket on the global mechanical behavior of the CLT shear wall are discussed.
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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 company Rothoblaas is acknowledged for the financial support given for the execution of the experimental campaign presented in the article. Special thanks to Eng. Riccardo Fanti for the support given in the FE analyses.
References
Blaß, H. J., and P. Fellmoser. 2004. “Design of solid wood panels with cross layers.” In Proc., World Conf. on Timber Engineering. Helsinki, Finland: Finnish Association of Civil Engineers.
Blaß, H. J., and R. Görlacher. 2004. “Compression perpendicular to the grain.” In Proc., World Conf. on Timber Engineering, 435–440. Helsinki, Finland: Finnish Association of Civil Engineers.
Bogensperger, T., T. Moosbrugger, and G. Silly. 2010. “Verification of CLT-plates under loads in plane.” In Vol. 1 of Proc., 11th World Conf. on Timber Engineering 2010, WCTE 2010, 231–240. Trento, Italy: Trees and Timber Institute, National Research Council.
Brandner, R., P. Dietsch, J. Dröscher, M. Schulte-wrede, H. Kreuzinger, and M. Sieder. 2017. “Cross laminated timber (CLT) diaphragms under shear: Test configuration, properties and design.” Constr. Build. Mater. 147 (Aug): 312–327. https://doi.org/10.1016/j.conbuildmat.2017.04.153.
Casagrande, D., S. Bezzi, G. D’Arenzo, S. Schwendner, A. Polastri, W. Seim, and M. Piazza. 2020. “A methodology to determine the seismic low-cycle fatigue strength of timber connections.” Constr. Build. Mater. 231 (Jan): 117026. https://doi.org/10.1016/j.conbuildmat.2019.117026.
Casagrande, D., A. Polastri, T. Sartori, C. Loss, and M. Chiodega. 2016. “Experimental campaign for the mechanical characterization of connection systems in the seismic design of timber buildings.” In Proc., World Conf. in Timber Engineering. Vienna, Austria: Vienna Univ. of Technology.
Casagrande, D., S. Rossi, T. Sartori, and R. Tomasi. 2015. “Proposal of an analytical procedure and a simplified numerical model for elastic response of single-storey timber shear-walls.” Constr. Build. Mater. 102 (Jan): 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 crosslaminated timber building.” Earthquake Eng. Struct. Dyn. 42 (13): 2003–2021. https://doi.org/10.1002/eqe.2309.
CEN (European Committee for Standardization). 2005. Timber structures. Test methods. Cyclic testing of joints made with mechanical fasteners. EN 12512:2001/A1. Brussels, Belgium: CEN.
CEN (European Committee for Standardization). 2008. Eurocode 5: Design of timber structures. Part 1–1: General—Common rules and rules for buildings. EN 1995-1-1:2008. Brussels, Belgium: CEN.
CSI (Computers and Structures). 2017. Integrated software for structural analysis and design. CSI-SAP2000. Berkeley, CA: CSI.
D’Arenzo, G. 2020. “Innovative biaxial behaviour connector for cross-laminated timber structures.” Ph.D. thesis, Faculty of Engineering and Architecture, Univ. of Enna “Kore.”
D’Arenzo, G., G. Rinaldin, M. Fossetti, and M. Fragiacomo. 2019. “An innovative shear-tension angle bracket for cross-laminated timber structures: Experimental tests and numerical modelling.” Eng. Struct. 197 (Oct): 109434. https://doi.org/10.1016/j.engstruct.2019.109434.
ETA-Denmark (European Technical Assessment). 2016. Screws for use in timber construction. ETA-11/0030. Copenhagen, Denmark: ETA.
ETA-Denmark (European Technical Assessment). 2018a. Nails and screws for use in nailing plates timber structures. ETA-13/0523. Copenhagen, Denmark: ETA.
ETA-Denmark (European Technical Assessment). 2018b. Solid wood slab elements to be used as structural elements in buildings. ETA-13/0815. Copenhagen, Denmark: ETA.
ETA-Denmark (European Technical Assessment). 2018c. Three-dimensional nailing plate (angle bracket for timber-to-timber or timber-to-concrete or steel connections). ETA-11/0496. Copenhagen, Denmark: ETA.
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.
Flatscher, G., and G. Schickhofer. 2016. “Displacement-based determination of laterally loaded cross laminated timber (CLT) wall systems.” In Proc., 3rd INTER Meeting—INTER/49-12-1. Graz, Austria: KIT Holzbau und Baukonstruktionen.
Gavric, I., M. Fragiacomo, and A. Ceccotti. 2015a. “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.
Gavric, I., M. Fragiacomo, and A. Ceccotti. 2015b. “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.
Izzi, M., A. Polastri, and M. Fragiacomo. 2018a. “Investigating the hysteretic behavior of cross-laminated timber wall systems due to connections.” J. Struct. Eng. 144 (5): 04018035. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002022.
Izzi, M., A. Polastri, and M. Fragiacomo. 2018b. “Modelling the mechanical behaviour of typical wall-to-floor connection systems for cross-laminated timber structures.” Eng. Struct. 162 (Jan): 270–282. https://doi.org/10.1016/j.engstruct.2018.02.045.
Liu, J., and F. Lam. 2018. “Experimental test of coupling effect on CLT angle bracket connections.” Eng. Struct. 171 (May): 862–873. https://doi.org/10.1016/j.engstruct.2018.05.013.
Liu, J., and F. Lam. 2019. “Experimental test of coupling effect on CLT hold-down connections.” Eng. Struct. 178 (Sep): 586–602. https://doi.org/10.1016/j.engstruct.2018.10.063.
Liu, J., F. Lam, R. Foschi, and M. Li. 2020. “Modeling the coupling effect of CLT connections under biaxial loading.” J. Struct. Eng. 146 (4): 04020040. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002589.
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 (Jan): 136–147. https://doi.org/10.1016/j.engstruct.2018.05.126.
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.
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., J. Schneider, and M. Schweinsteiger. 2010. “Lateral load resistance of cross-laminated wood panels.” In Proc., 11th World Conf. on Timber Engineering, 3394–3403. Trento, Italy: Trees and Timber Institute, National Research Council.
Pozza, L., B. Ferracuti, M. Massari, and M. Savoia. 2018a. “Axial–shear interaction on CLT hold-down connections—Experimental investigation.” Eng. Struct. 160 (Jan): 95–110. https://doi.org/10.1016/j.engstruct.2018.01.021.
Pozza, L., A. Saetta, M. Savoia, and D. Talledo. 2017. “Coupled axial-shear numerical model for CLT connections.” Constr. Build. Mater. 150 (Sep): 568–582. https://doi.org/10.1016/j.conbuildmat.2017.05.141.
Pozza, L., A. Saetta, M. Savoia, and D. Talledo. 2018b. “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.
Reynolds, T., R. Foster, M. Ramage, J. Bregulla, W.-S. Chang, and R. Harris. 2017. “Lateral-load resistance of cross-laminated timber shear walls.” J. Struct. Eng. 143 (12): 06017006. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001912.
Rinaldin, G., C. Amadio, and M. Fragiacomo. 2013. “A component approach for the hysteretic behaviour of connections in cross-laminated wooden structures.” Earthquake Eng. Struct. Dyn. 42 (13): 2023–2042. https://doi.org/10.1002/eqe.2310.
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: Graz Univ. of Technology.
Seim, W., and J. Hummel. 2013. Deliverable 2D: CLT wall elements—Monotonic and cyclic testing. Kassel, Germany: Dept. of Structural Engineering, Building Rehabilitation and Timber Engineering, Univ. of Kassel.
van de Lindt, J., J. Furley, M. O. Amini, S. Pei, G. Tamagnone, A. R. Barbosa, D. Rammer, P. Line, M. Fragiacomo, and M. Popovski. 2019. “Experimental seismic behavior of a two-story CLT platform building.” Eng. Struct. 183 (Nov): 408–422. https://doi.org/10.1016/j.engstruct.2018.12.079.
Vogt, T., and W. Seim. 2014. “Advanced modelling of timber-framed wall elements for application in engineering practice.” In Proc., Int. Network on Timber Engineering Research, 1–13. Bath, UK: KIT Holzbau und Baukonstruktionen.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 18, 2020
Accepted: Jan 13, 2021
Published online: Apr 26, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 26, 2021
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