Steel‐Reinforced Glued Laminated Timber
Publication: Journal of Structural Engineering
Volume 115, Issue 2
Abstract
A possible candidate for replacement of tension laminations in glulam beams is examined. The replacement is a composite of concrete‐reinforcing steel embedded in oriented flakeboard. Pullout tests were used to select the best of three possible furnishes for the composite. After this selection, beams were fabricated. Control beams with no reinforcing and beams with one lamina replaced with the steel‐wood composite were tested. The beams were tested both dry (50% RH) and wet (90% RH). The dry beams exhibited increases in stiffness of 24% and 32% and increases in ultimate moment capacity of 29% and 30% for one number 3 or number 4 bar, respectively, in the beam. The wet beams also showed increases in stiffness on the order of 30% but showed no significant increases in strength. This lack of reinforcing effect is likely to be a combination of increased steel stress due to reduced wood modulus of elasticity with increased moisture content and decreased flakeboard internal bond strength due to increased moisture content.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Biblis, E. J. (1965). “Analysis of wood‐fiberglass composite beams within and beyond the elastic region.” Forest Prod. J., 15(2), 81–88.
2.
Bohannan, B. (1962). “Prestressing wood members.” Forest Prod. J., 12(12), 596–602.
3.
Bohannan, B. (1964). “Prestressed laminated wood beams.” U.S. Forest Prod. Lab. Res. Paper FPL 8, USDA Forest Service, Madison, Wisc., Jan., 32 pp.
4.
Bond, D. (1966). “Reinforced timber beams.” Civ. Engrg. Public Works Rev., 61, 1227–1229.
5.
Boomsliter, G. P. (1948). “Timber beams reinforced with spiral drive dowels.” West Virginia Univ. Bull., October, Morgantown, W. Va.
6.
Borgin, K. B., Loedolff, B. F., and Saunders, G. R. (1968). “Laminated wood beams reinforced with steel strips.” J. Struct. Engrg., ASCE, 94(ST1), 1681–1705.
7.
Bulleit, W. M. (1984). “Reinforcement of wood materials: A review.” Wood and Fiber Sci., 16(3), 391–397.
8.
Coleman, G. E., and Hurst, H. T. (1974). “Timber structures reinforced with light gage steel.” Forest Prod. J., 24(7), 45–53.
9.
Dziuba, T. (1985). “The ultimate strength of wooden beams with tension reinforcement.” Holzforschung und Holzverwertung 37(6), 115–119.
10.
Hoyle, R. J. (1975). “Steel reinforced wood beam design.” Forest Prod. J., 25(4), 17–23.
11.
Kobetz, R. W., and Krueger, G. P. (1976). “Ultimate‐strength design of reinforced timber: Biaxial stress failure criteria.” Wood Sci., 8(4), 252–262.
12.
Krueger, G. P. (1973). “Ultimate strength design of reinforced timber: State of the art, 1973.” Wood Sci., 6(2), 175–186.
13.
Krueger, G. P., and Eddy, F. M., Jr. (1974). “Ultimate strength design of reinforced timber: Moment‐rotation characteristics.” Wood Sci., 6(4), 330–344.
14.
Krueger, G. P., and Sandberg, L. B. (1974). “Ultimate‐strength design of reinforced timber beams: Evaluation of design parameters.” Wood Sci., 6(4), 316–330.
15.
Lantos, G. (1964a). “Reinforced and post‐tensioned glulam beams under development at TRADA Labs.” Civ. Engrg. (London) 59(690).
16.
Lantos, G. (1964b). “Test results on mild steel reinforced laminated timber beams.” Civ. Engrg. (London) 59(700).
17.
Lantos, G. (1970). “The fiexural behavior of steel reinforced laminated timber beams.” Wood Sci., 2(3), 136–143.
18.
Lantos, G., and Harvey, R. (1964). “Tests on flitch and plank beams.” Timber Res. and Development Association, England.
19.
Nilson, A. H., and Winter, G. (1986). Design of concrete structures, 10th Ed. McGraw‐Hill Book Co., Inc., New York, N.Y.
20.
Peterson, John. (1965). “Wood beams prestressed with bonded tension elements.” J. Struct. Engrg., ASCE, 91(ST1), 103–119.
21.
Sliker, A. (1962). “Reinforced wood laminated beams.” Forest Prod. J., 12(12), 91–96.
22.
Stern, E. G. (1973). “Flitch beams.” Forest Prod. J., 25(4), 40–47.
23.
Theakston, F. M. (1965). “A feasibility study for strengthening timber beams with fiberglass.” Can. Agric. Engrg., Jan., 17–19.
24.
Woods, G. J. (1986). “Steel reinforced tension laminations for glulam beams,” thesis presented to the Michigan Technological University, Houghton, Mich., in partial fulfillment of the requirements for the degree of Master of Science.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 115 • Issue 2 • February 1989
Pages: 433 - 444
Copyright
Copyright © 1989 ASCE.
History
Published online: Feb 1, 1989
Published in print: Feb 1989
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.