Title:
Shear Strength of Hollow-Core FRP-Concrete-Steel Columns
Author(s):
ohamed ElGawady
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/29/2020
Abstract:
The shear behavior of hollow-core composite short columns under seismic loading will be presented. The investigated composite columns consisted of a concrete wall placed between an outer circular fiber reinforced polymer (FRP) and an inner circular steel tubes creating a hollow-core FRP-concrete-steel (HC-FCS) columns. Three-dimensional numerical models were developed and validated against experimental results. The models subsequently were used to conduct a parametric finite element (FE) study by performing a nonlinear-static analysis on the shear behavior of the HC-FCS short columns under combined axial and lateral loadings. The investigated parameters are the effects of the column aspect ratio, concrete wall thickness steel tube width-to-thickness (Ds/ts) ratio, confinement ratio, applied axial load level, and column concrete strength. This study revealed that the shear behavior of HC-FCS short columns is close to an extent to the behaviors of RC columns. A comparison between the attained shear strengths and the existing analytical models in the literature were carried out. A critical assessment of these shear strength models revealed vast differences in predicted responses. Finally, a new expression is proposed to predict the shear strength of HC-FCS columns under seismic loads for design purposes and showed a significantly improved correlation with the FE results.