Bracing of Wood Composite I-Joists to Resist Lateral Buckling from Walking Loads
Publication: Journal of Construction Engineering and Management
Volume 140, Issue 9
Abstract
Lateral buckling of unbraced beams during construction may be an important cause of fatalities and injuries. Temporary bracing to restrict lateral buckling is a potential preventive approach, but has received little study. Lateral acceleration, lateral displacement, and rotation of wood composite I-joists were measured under different bracing conditions while participants traversed the joists. Five different bracing stiffnesses and two different bracing placements were examined. Lateral displacement and rotation increased near the midspan of the joist, while acceleration remained consistent. Greater lateral displacement and rotation were found with increasing participant weight and lack of construction experience. Construction experience was found to be a significant factor in the amount of joist motion. A safety platform similar to the testing methods discussed may have potential as a training tool to expose workers to partially braced joists. The relationship of lateral displacement and rotation with bracing stiffness was nonlinear. Bracing placement had little effect upon lateral displacement and rotation. Increased bracing stiffness reduced lateral displacement and rotation at a decreasing rate, indicating that bracing stiffness can be optimized to reduce cost.
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Acknowledgments
This work was supported by an award (R21OH008902) from the Centers for Disease Control and Prevention (CDC). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the CDC.
References
American Forest & Paper Association (AF&PA). (1996). Load Resistance Factor Design National Manual for Engineered Wood Construction, Washington, DC, 250.
American Forest & Paper Association (AF&PA). (2003). Technical Rep. 14: Designing for Lateral-Torsional Stability in Wood Members. Washington, DC, 37.
Black, F. O., Wall, C., III, Rockette, H. E., and Kitch, R. (1982). “Normal subject postural sway during the Romberg test.” Am. J. Otolaryngol., 3(5), 309–318.
Bureau of Labor Statistics (BLS). (2010). “Census of fatal occupational injuries.” 〈http://www.bls.gov/iif/oshwc/cfoi/cfoi_revised08.pdf〉 (Oct. 5, 2010).
Burow, J. R., Manbeck, H. B., and Janowiak, J. J. (2006). “Lateral stability of composite wood I-joists under concentrated-load bending.” Trans. ASABE., 49(6), 1867–1880.
Capodaglio, P., Castelnuovo, G., Brunani, A., Vismara, L., Villa, V., and Capodaglio, E. M. (2010). “Functional limitations and occupational issues in obesity: A review.” Int. J. Occup. Saf. Ergon., 16(4), 507–523.
Center for Disease Control (CDC). (2012). “Fatality assessment and control evaluation (FACE) program.” 〈http://www.cdc.gov/niosh/face/inhouse.html〉 (Oct. 14, 2012).
Figueiredo, F. P., da Silva, J. G. S., de Lima, L. R. O., and da S. Vellasco, P. C. G. (2010). “A parametric study of composite footbridges under pedestrian walking loads.” Eng. Struct., 30(3), 605–615.
Gauchard, G., Chau, N., Mur, J. M., and Perrin, P. (2001). “Falls and working individuals: Role of extrinsic and intrinsic factors.” Ergon., 44(14), 1330–1339.
Hindman, D. P., Manbeck, H. B., and Janowiak, J. J. (2005). “Measurement and prediction of lateral torsional buckling loads of composite wood materials: I-joist sections.” For. Prod. J., 55(10), 43–48.
Hindman, D. P., Timko, P. D., and Nussbaum, M. A. (2013). “Mechanical response of unbraced wood composite I-joist to walking loads.” J. Constr. Eng. Manage., 04013023.
Hsiao, H., and Simeonov, P. (2001). “Preventing falls from roofs: A critical review.” Ergon., 44(5), 537–561.
Huang, X., and Hinze, J. (2003). “Analysis of construction worker fall incidents.” J. Constr. Eng. Manage., 262–271.
Lipscomb, H. J., Dale, A. M., Kaskutas, W., Sherman-Voellinger, R., and Evanoff, B. (2008). “Challenges in residential fall prevention: Insight from apprentice carpenters.” Am. J. Ind. Med., 51(1), 60–68.
Mutton, B. R., and Trahair, N. S. (1973). “Stiffness requirements for lateral bracing.” J. Struct. Div., 99(10), 2176–2182.
Perrin, P., Schneider, D., Deviterne, D., Perrot, C., and Constantinescu, L. (1998). “Training improves the adaptation to changing visual conditions in maintaining human posture control in a test of sinusoidal oscillation of the support.” Neurosci. Lett., 245(3), 155–158.
Racic, V., Pavic, A., and Brownjohn, J. M. W. (2009). “Experimental identification and analytical modeling of human walking forces: Literature review.” J. Sound and Vib., 326(1–2), 1–49.
Romberg, M. H. (1853). Manual of nervous diseases of man, Sydenham Society, London, 395–401.
Timoshenko, S., and Gere, J. M. (1961). Theory of elastic stability, 2nd Ed., McGraw-Hill, New York, 518.
Wang, C. M., Ang, K. K., and Wang, L. (1995). “Optimization of bracing and internal support locations for beams against lateral bracing.” Struct. Optim., 9(1), 12–17.
Weyerhaeuser. (2012). “TB-104: Information about floor performance.” 〈http://www.woodbywy.com/literature/TB-104.pdf〉 (Jul. 22, 2012).
Winter, D. A. (1995). “Human balance and posture control during standing and walking.” Gait Posture, 3(4), 193–214.
Yura, J. A. (1995). “Bracing for stability—State-of-the-art.” Restructuring: America and beyond: Proc., Struture Congress XIII, ASCE, Reston, VA, 1886.
Zahn, J. J. (1984). “Bracing requirements for lateral stability.” J. Struct. Eng., 1786–1802.
Zahn, J. J. (1985). “Lateral stability of beams with elastic end restraints.” J. Eng. Mech., 500–511.
Zhu, E. C., Guan, Z. W., Rodd, P. D., and Pope, D. J. (2005). “Buckling of oriented strand board webbed wood I-joists.” J. Struct. Eng., 1629–1636.
Zirakian, T., and Showkati, H. (2007). “Experiments on distortional buckling of I-beams.” J. Struct. Eng., 1009–1017.
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© 2014 American Society of Civil Engineers.
History
Received: May 21, 2013
Accepted: Feb 25, 2014
Published online: May 19, 2014
Published in print: Sep 1, 2014
Discussion open until: Oct 19, 2014
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