Seismic Shear Strengthening of Reinforced Concrete Short Columns Using Ferrocement with Expanded Metal

Authors

  • Songkran Panyamul Sripatum University
  • Phaiboon Panyakapo Sripatum University
  • Anat Ruangrassamee Chulalongkorn University

DOI:

https://doi.org/10.4186/ej.2019.23.6.175

Keywords:

shear strengthening, reinforced concrete, short columns, ferrocement, expanded metal

Abstract

Typical reinforced concrete short column is brittle in shear rather than flexure under lateral cyclic loading due to its shear deficiency.  This paper presents the improvement of seismic behaviour of the reinforced concrete short columns which were strengthened by using ferrocement with expanded metal.  Full scale experiments were conducted for two strengthened concrete columns with different volume fractions of expanded metal and the control specimen under lateral cyclic loading.  It was found that the seismic behaviour in terms of the shear strength, stiffness, displacement ductility, and energy dissipation were significantly improved.  The expanded metal mesh with the high specific surface provided the better performance for controlling the crack propagation.  The brittle shear failure mode of the stirrup was reduced and the ductile flexure mode of the longitudinal reinforcement was dominant.  The reduced shear force of the stirrup was compensated by the shear force of the expanded metal reinforcement which experienced relatively large strain.  The technique of steel angle installation at the corners of column can successfully prevent the effect of sharpened corner wrapping of the mesh.  A model to predict the shear strength of the strengthened column is presented in term of the global efficiency factor for expanded mental.     

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Author Biographies

Songkran Panyamul

Department of Civil Engineering and Urban Development, School of Engineering, Sripatum University, Bangkok 10900, Thailand

Phaiboon Panyakapo

Department of Civil Engineering and Urban Development, School of Engineering, Sripatum University, Bangkok 10900, Thailand

Anat Ruangrassamee

Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Published

Vol 23 No 6, Nov 30, 2019

How to Cite

[1]
S. Panyamul, P. Panyakapo, and A. Ruangrassamee, “Seismic Shear Strengthening of Reinforced Concrete Short Columns Using Ferrocement with Expanded Metal”, Eng. J., vol. 23, no. 6, pp. 175-189, Nov. 2019.