Investigation of Structural Properties of Used Formwork Stringers
Publication: Journal of Materials in Civil Engineering
Volume 8, Issue 1
Abstract
Results of an experimental investigation of the structural properties of used slab formwork stringers are presented. The samples tested were obtained from eight concrete construction sites in Chicago, Milwaukee, and Minneapolis–St. Paul. All samples collected were 100 × 150 mm (4 × 6 in.) nominal-size solid lumber. Samples with legible mill stamp were Douglas fir. Grades varied from Select Structural to No. 2. Samples were tested according to the guidelines specified by ASTM for lumber in structural sizes. This paper presents the observed values for shear modulus, modulus of elasticity, modulus of rupture, and shear strength parallel to grain. The observed structural properties are modeled with appropriate probability distributions. The observed data are used to investigate the correlation between stringer modulus of rupture and modulus of elasticity and modulus of rupture and shear strength.
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References
1.
Ayoub, H. N., and Karshenas, S.(1994). “Survey results for concrete construction live loads on newly poured slabs.”J. Struct. Engrg., ASCE, 120(5), 1543–1562.
2.
Evans, J. W., and Green, D. W. (1987). “Mechanical properties of visually graded lumber: Vol. 2, Douglas Fir-Larch.”NTIS PB 88-159397, Nat. Tech. Information Service, Springfield, Va.
3.
Hurd, M. K. (1989). Formwork for concrete . Spec. Publ. No. 4, Am. Concrete Inst., Detroit, Mich.
4.
Karshenas, S., and Ayoub, H. N.(1994a). “Construction live loads on slab formworks before concrete placement.”J. Struct. Safety, 14, 144–172.
5.
Karshenas, S., and Ayoub, H. N.(1994b). “Analysis of concrete construction live loads on newly poured slabs.”J. Struct. Engrg., ASCE, 120(5), 1525–1542.
6.
Karshenas, S., and Heinrich, S. M. (1994). Dynamic modeling of slab formwork during concrete placement. J. Struct. Engrg., ASCE, 120(7), 2199–2219.
7.
Standard test methods for establishing structural grades and related allowable properties for visually graded lumber; Vol. 4.09, D245-88. (1990a). ASTM, Philadelphia, Pa.
8.
Standard test methods for specific gravity of wood and wood-based materials; Vol. 4.09, D2395-83. (1990a). ASTM, Philadelphia, Pa.
9.
Static test of timber in structural sizes; Vol. 4.09, D198-84. (1990a). ASTM, Philadelphia. Pa.
10.
Wood handbook: wood as an engineering material. (1987). Prepared by Forest Products Lab., Forest Service, U.S. Dept. of Agric., Washington, D.C.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 8 • Issue 1 • February 1996
Pages: 51 - 56
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Feb 1, 1996
Published in print: Feb 1996
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