Research at structural concrete laboratory
Behavior of curved elements or discontinuous elements
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.
Nodal regions of reinforced concrete frames
DOI : /10.1016/j.engstruct.2013.01.029