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Bending stresses in insulated concrete sandwich panels
Authors: Jofriet, J.C. And D.M. Thompson
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Download file: https://library.csbe-scgab.ca/docs/journal/27/27_1_49_ocr.pdf
Published in: CBE Journal » CBE Journal Volume 27 (1985)
Download RAW file: https://library.csbe-scgab.ca/docs/journal/27/27_1_49_raw.pdf
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Description: An increasing number of farm operators select concrete for the walls of their confinement buildings. This is particularly true for hog operations. Concrete is durable, rodent-proof and does not support combustion. An excellent way to insulate a concrete wall is to sandwich insulation between two wythes of concrete. Both pre cast tilt-up panels and cast-in-place sandwich construction are being used increasingly in Southern Ontario (Jofriet and Singleton 1982, 1983). Some of the Ontario applications used have been described by Milne (1975), Bellman (1977), Bird and Selves (1977) and by Kains (1980). Tilt-up concrete sandwich panels have to withstand a considerable bending moment during erection when sections of wall that were constructed horizontally are lifted into a vertical position. The panels have to be adequately strong to prevent tension cracking on the bottom of the unit. The determination of the maximum bending stress from the maximum bending moment is not easy. The well-known elastic bending formula is not valid because it is based on the assumption that plane cross sections remain plane. This is not the case with a sandwich panel subjected to varying bending moments. The shear forces cause considerable shear deformations in the insulation which typically has a modulus of elasticity 2000 - 3000 times smaller than that of concrete. Furthermore, the type of connection between the two wythes of concrete affects the bending stresses considerably.
Keywords: bending stresses in insulated concrete sandwich panels
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Citation: Jofriet, J.C. and D.M. Thompson 1985. BENDING STRESSES IN INSULATED CONCRETE SANDWICH PANELS. Canadian Agricultural Engineering 27(1):49-50.
Volume: 27
Issue: 1
Pages 49 - 50
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Date: 1985
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Coverage: Canada
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DOI:
Description: An increasing number of farm operators select concrete for the walls of their confinement buildings. This is particularly true for hog operations. Concrete is durable, rodent-proof and does not support combustion. An excellent way to insulate a concrete wall is to sandwich insulation between two wythes of concrete. Both pre cast tilt-up panels and cast-in-place sandwich construction are being used increasingly in Southern Ontario (Jofriet and Singleton 1982, 1983). Some of the Ontario applications used have been described by Milne (1975), Bellman (1977), Bird and Selves (1977) and by Kains (1980). Tilt-up concrete sandwich panels have to withstand a considerable bending moment during erection when sections of wall that were constructed horizontally are lifted into a vertical position. The panels have to be adequately strong to prevent tension cracking on the bottom of the unit. The determination of the maximum bending stress from the maximum bending moment is not easy. The well-known elastic bending formula is not valid because it is based on the assumption that plane cross sections remain plane. This is not the case with a sandwich panel subjected to varying bending moments. The shear forces cause considerable shear deformations in the insulation which typically has a modulus of elasticity 2000 - 3000 times smaller than that of concrete. Furthermore, the type of connection between the two wythes of concrete affects the bending stresses considerably.
Keywords: bending stresses in insulated concrete sandwich panels
Résumé:
Mots-clés:
Citation: Jofriet, J.C. and D.M. Thompson 1985. BENDING STRESSES IN INSULATED CONCRETE SANDWICH PANELS. Canadian Agricultural Engineering 27(1):49-50.
Volume: 27
Issue: 1
Pages 49 - 50
Contributor:
Date: 1985
Technical field:
Conference name:
Session name:
Other information:
Type:
Format:
Publication type:
Source:
Relation:
Coverage: Canada
Language 1:
Language 2:
Rights:
Notes:
Other files:
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