Behavior and Modeling of Glulam Beams with Bolted Connections Subjected to Shock Tube–Simulated Blast Loads
Publication: Journal of Structural Engineering
Volume 147, Issue 1
Abstract
An experimental program investigating the behavior of glued laminated timber (glulam) assemblies with various bolted connections subjected to simulated blast loading was undertaken. A total of 14 full-scale tests on glulam members with idealized and realistic boundary conditions were carried out using a shock tube apparatus capable of simulating the effects of far-field blast explosions. Full-scale glulam specimens with bolted connections designed to yield in bolt bending performed better than those that were overdesigned. Proper detailing of the bolt group geometry was found to be sufficient to achieve the desired failure sequence. Reinforcement with self-tapping screws changed the failure mode from that of splitting to a combination of bolt yielding and wood crushing and provided additional ductility in the assembly. A two-degree-of-freedom blast analysis was found to adequately capture the system response with reasonable accuracy. An investigation of the current Canadian blast design provisions showed that the design approach does not allow for energy dissipation in the assembly. An approach is proposed that requires more stringent provisions for the design of brittle failure modes in connections and ensures that ultimate failure will occur in load-bearing timber elements.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
References
Amadio, C., and C. Bedon. 2012. “Viscoelastic spider connectors for the mitigation of cable-supported façades subjected to air blast loading.” Eng. Struct. 42 (Sep): 190–200. https://doi.org/10.1016/j.engstruct.2012.04.023.
ASCE. 2011. Blast protection of buildings. ASCE/SEI 59. Reston, VA: ASCE.
ASTM. 2014. Standard specification for carbon steel bolts, studs, and threaded rod 60 000 PSI tensile strength. ASTM A307. West Conshohocken, PA: ASTM.
ASTM. 2015. Standard test methods for single-bolt connections in wood and wood-based products. ASTM D5652. West Conshohocken, PA: ASTM.
ASTM. 2017. Standard test method for determining bending yield moment of nails. ASTM F1575. West Conshohocken, PA: ASTM.
ASTM. 2018. Standard test method for evaluating dowel-bearing strength of wood and wood-based products. ASTM D5764-97AR18. West Conshohocken, PA: ASTM.
AWC (American Wood Council). 2015. National design specification for wood construction. Leesburg, VA: AWC.
Biggs, J. M. 1964. Introduction to structural dynamics. New York: McGraw-Hill.
Brühl, F., U. Kuhlmann, and A. Jorissen. 2011. “Consideration of plasticity within the design of timber structures due to connection ductility.” Eng. Struct. 33 (11): 3007–3017. https://doi.org/10.1016/j.engstruct.2011.08.013.
CEN (European Committee for Standardization). 2004. Eurocode 5: Design of timber structures. ENV 1995-1-1. Brussels, Belgium: CEN.
Closen, M. 2014. White paper: Full thread SWG ASSY screws as reinforcement. Surrey, BC, Canada: MyTiCon Timber Connectors.
Côté, D., and G. Doudak. 2019. “Experimental investigation of cross-laminated timber panels with realistic boundary conditions subjected to simulated blast loads.” Eng. Struct. 187 (May): 444–456.
Crawford, J. E., K. B. Morrill, D. A. Sunshine, and J. M. Magallanes. 2012. “Date and modeling for the performance of pristine and blast damaged connections.” In Proc., Structures Congress 2012. Reston, VA: ASCE.
CSA (Canadian Standards Association). 2012. Design and assessment of buildings subjected to blast loads. CSA S850. Mississauga, ON, Canada: CSA.
CSA (Canadian Standards Association). 2019. Engineering design in wood. CSA O86. Mississauga, ON, Canada: CSA.
Daneff, G. 1997. “Response of bolted connections to pseudodynamic (cyclic) loading.” M.Sc. thesis, Faculty of Forestry and Environmental Management, Univ. of New Brunswick.
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.
ETA (European Technical Assessment). 2016. HECO-TOPIX screws for use in timber constructions. ETA-11/0284. Germany: ETA.
Foschi, R. O., B. Folz, and F. Yao. 1989. Reliability-based design of wood structures. Vancouver, BC, Canada: Univ. of British Columbia.
Gerber, A., and T. Tannert. 2015. “Timber-concrete composites using flat-plate engineered wood products.” In Proc., Structures Congress 2015, 2314–2325. Reston, VA: ASCE.
Girhammar, U. A., and H. Andersson. 1988. “Effect of loading rate on nailed timber joint capacity.” J. Struct. Eng. 114 (11): 2439–2456. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:11(2439).
Jacques, E., A. Lloyd, A. Braimah, M. Saatcioglu, G. Doudak, and O. Abdelalim. 2014. “Influence of high strain-rates on the dynamic flexural material properties of spruce–pine–fir wood studs.” Can. J. Civ. Eng. 41 (1): 56–64. https://doi.org/10.1139/cjce-2013-0141.
Jorissen, A. 1998. “Double shear timber connections with dowel type fasteners.” Ph.D. dissertation, Dept. of Civil Engineering, Delft Univ.
Karns, J. E., D. L. Houghton, B. E. Hall, J. Kim, and K. Lee. 2007. “Analytical verification of blast testing of steel frame moment connection assemblies.” In Proc., Research Frontiers at Structures Congress, 1–19. Reston, VA: ASCE.
Lacroix, D. N., and G. Doudak. 2015. “Investigation of dynamic increase factors in light-frame wood stud walls subjected to out-of-plane blast loading.” J. Struct. Eng. 141 (6): 04014159. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001139.
Lacroix, D. N., and G. Doudak. 2018a. “Determining the dynamic increase factor for glued-laminated timber beams.” J. Struct. Eng. 144 (9): 04018160. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002146.
Lacroix, D. N., and G. Doudak. 2018b. “Experimental and analytical investigation of FRP retrofitted glued-laminated beams subjected to simulated blast loading.” J. Struct. Eng. 144 (7): 04018089. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002084.
Lam, F., M. Schulte-Wrede, C. C. Yao, and J. J. Gu. 2008. “Moment resistance of bolted timber connections with perpendicular to grain reinforcements.” In Proc., 10th World Conf. on Timber Engineering. Red Hook, NY: Curran Associates.
McGrath, A. 2020. “Investigating the response of bolted wood connections subjected to blast loads.” M.A.Sc. thesis, Dept. of Civil Engineering, Univ. of Ottawa.
McGrath, A., C. Viau, and G. Doudak. 2019. “Investigating the response of bolted wood connections to the effects of blast loading.” In Proc., CSCE 2019 Annual Conf. Laval, QC, Canada: Canadian Society for Civil Engineering.
Mischler, A., H. Prion, and F. Lam. 2000. “Load-carrying behaviour of steel-to-timber dowel connections.” In Proc., World Conf. of Timber Engineering 2000, edited by J. D. Barrett. Vancouver, BC, Canada: Univ. of British Columbia.
Morrill, K. B., J. E. Crawford, J. M. Magallanes, and H. J. Choi. 2007. “Development of simplified tools to predict blast response of steel beam-column connections.” In Proc., Research Frontiers at Structures Congress. Reston, VA: ASCE. https://doi.org/10.1061/40944(249)69.
Newmark, N. M. 1959. “A method of computation for structural dynamics.” J. Eng. Mech. Div. 85 (3): 67–94.
Nordic Structures. 2015. Nordic engineered wood non-residential design construction guide. Document N-C122. Montreal: Nordic Structures.
Poulin, M., C. Viau, D. N. Lacroix, and G. Doudak. 2017. “Experimental and analytical investigation of cross-laminated timber panels subjected to out-of-plane blast loads.” J. Struct. Eng. 144 (2): 04017197. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001915.
Poulin, M., C. Viau, D. N. Lacroix, and G. Doudak. 2018. “Experimental and analytical investigation of cross-laminated timber panels subjected to out-of-plane blast loads.” J. Struct. Eng. 144 (2): 04017197. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001915.
Quenneville, J. H., and M. Mohammad. 2001. “Design method for bolted connections loaded perpendicular-to-grain.” Can. J. Civ. Eng. 28 (6): 949–959. https://doi.org/10.1139/l01-059.
Stoddart, E. P., M. P. Byfield, and A. Tyas. 2014. “Blast modeling of steel frames with simple connections.” J. Struct. Eng. 140 (1): 04013027. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000778.
UFC (Unified Facilities Criteria Program). 2008. Structures to resist the effects of accidental explosions. Washington, DC: US of America Dept. of Defense.
Viau, C., and G. Doudak. 2016a. “Investigating the behavior of light-frame wood stud walls subjected to severe blast loading.” J. Struct. Eng. 142 (12): 04016138. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001622.
Viau, C., and G. Doudak. 2016b. “Investigating the behavior of typical and designed wall-to-floor connections in light-frame wood stud wall structures subjected to blast loading.” Can. J. Civ. Eng. 43 (6): 562–572. https://doi.org/10.1139/cjce-2015-0452.
Viau, C., and G. Doudak. 2019a. “Analytical modelling of heavy timber assemblies with realistic boundary conditions subjected to blast loading.” In Proc., CSCE 2019 Annual Conf. Laval, QC, Canada: Canadian Society for Civil Engineering.
Viau, C., and G. Doudak. 2019b. “Behaviour and modelling of cross-laminated timber panels with boundary connections subjected to blast loads.” Eng. Struct. 197 (Oct): 109404. https://doi.org/10.1016/j.engstruct.2019.109404.
Viau, C., D. N. Lacroix, and G. Doudak. 2016. “Damage level assessment of response limits in light-frame wood stud walls subjected to blast loading.” Can. J. Civ. Eng. 44 (2): 106–116. https://doi.org/10.1139/cjce-2015-0418.
Wang, M., X. Song, X. Gu, Y. Zhang, and L. Luo. 2015. “Rotational behavior of bolted beam-to-column connections with locally cross-laminated glulam.” J. Struct. Eng. 141 (4): 04014121. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001035.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 30, 2020
Accepted: Aug 18, 2020
Published online: Oct 25, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 25, 2021
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