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Curved elements are often used in the construction of cut-and-cover
tunnels, silos and vaults. The behavior of these elements exhibits
several particularities that prevent the direct application of
conventional theories or analysis methods (for rectilinear members)
in their design.
In particular, the spalling strength of reinforcement is strongly
dependent on the the interaction between the deviation forces of the
tensile reinforcement and the transverse tensile stresses due to the
steel-concrete bond.
A specific research performed at the Structural Concrete Laboratory
has shown that the spalling strength of these members can be
significantly decreased depending on the state of strain in the
tensile reinforcement. Furthermore, the shear strength of these
members also depends on the curvature, with either a favorable or
an unfavorable effect.
A test campaign at the Structural Concrete Laboratory has demonstrated
this point and allowed its inclusion in the Critical Shear Crack
Theory.
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Reference publications
Curved elements
- Fernández Ruiz M., Plumey S., Muttoni A., Interaction between Bond and Deviation Forces in Spalling Failures of Arch-Shaped Members without Transverse Reinforcement, ACI Structural Journal, V. 107, USA, 2010, pp. 346-354.
- Campana S., Fernández Ruiz M., Muttoni A., Shear Strength of Arch-Shaped Members without Transverse Reinforcement, ACI Structural Journal, V. 111, No. 1-6, USA, 2014.
Nodal regions of reinforced concrete frames
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