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Structural Engineering and Mechanics
  Volume 22, Number 3, February20 2006, pages 311-330
DOI: http://dx.doi.org/10.12989/sem.2006.22.3.311
 


Post-peak response analysis of SFRC columns including spalling and buckling
Rajesh P. Dhakal

 
Abstract
    Standard compression tests of steel fiber reinforced concrete (SFRC) cylinders are conducted to formulate compressive stress versus compressive strain relationship of SFRC. Axial pullout tests of SFRC specimens are also conducted to explore its tensile stress strain relationship. Cover concrete spalling and reinforcement buckling models developed originally for normal reinforced concrete are modified to extend their application to SFRC. Thus obtained monotonic material models of concrete and reinforcing bars in SFRC members are combined with unloading/reloading loops used in the cyclic models of concrete and reinforcing bars in normal reinforced concrete. The resulting path-dependent cyclic material models are then incorporated in a finite-element based fiber analysis program. The applicability of these models at member level is verified by simulating cyclic lateral loading tests of SFRC columns under constant axial compression. The analysis using the proposed SFRC models yield results that are much closer to the experimental results than the analytical results obtained using the normal reinforced concrete models are.
 
Key Words
    steel fiber reinforced concrete (SFRC); elasto-plastic and fracture (EPF) model; tension softening/stiffening model; cover spalling, reinforcement buckling; fiber analysis.
 
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