NDLI: Stiffness of reinforced concrete slabs subjected to torsion

Content Provider	Springer Nature Link
Author	Lopes, Adeli V. Lopes, Sérgio M. R. Carmo, Ricardo N. F.
Copyright Year	2013
Abstract	The study of torsion in reinforced concrete members began in the early twentieth century but it has become more widespread in the past 60 years. Even today, this topic has not been deeply researched with respect to slabs. This work reports a study on the behavior of reinforced concrete slabs subjected to torsion, with particular attention to the stiffness in state I and state II (uncracked and cracked phase) and to the relation T–θ (torsional moment-twist). It is known that torsional forces lead to a much larger loss of stiffness in state II, due to the strong cracking, than the loss of flexural stiffness. When the member is predominantly subjected to bending moments the K $_{I}$/K $_{II}$ ≈ 3–5 is usually admitted, but when torsion has a preponderant role this relationship is not valid. This study may alert the scientific community to a seemingly unknown relation: torsional stiffness of reinforced concrete slabs, in the cracked phase, is about 1/17–1/15 of the stiffness in the elastic phase. For the analysis of slab deformation, particularly under service conditions, accurate knowledge of the slab stiffness in state II is important. The knowledge of T–θ relation is also important to perform a numerical nonlinear analysis. An experimental program was designed and carried out in which 9 slabs were tested until failure. To submit the slabs predominantly to torsional moments, vertical movement at 3 corners was restricted and the action was applied to the fourth corner. Based on the results obtained, the following relations were defined: load–displacement (P–d), torsional moment-twist (T–θ) and K $_{T,I}$/K $_{T,II}$.
Starting Page	227
Ending Page	238
Page Count	12
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	47
Issue Number	1-2
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-03-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Torsion Slab Stiffness Concrete Steel reinforcement Structural Mechanics Materials Science Theoretical and Applied Mechanics Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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