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.
 

 

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, USA, 2014.
  • Nodal regions of reinforced concrete frames

  • Campana S., Fernández Ruiz M., Muttoni A., Behaviour of nodal regions of reinforced concrete frames subjected to opening moments and proposals for their reinforcement, Engineering Structures, Volume 51, June 2013, Pages 200–210.
    DOI : /10.1016/j.engstruct.2013.01.029