Analytical evaluation of compressive struts and load-carried capacity of column-beam joints in RC rigid frame viaducts under two-directional loading

Abstract

For the purpose of clarifying the load-bearing mechanism and load-bearing capacity of the joint during two-way loading, we investigated the beam-column joint of ridged frame viaduct by finite element analysis. Inner radium of axial rebars in the transverse beam affects the bearing capacity of the joint because a compressive strut is formed at the bending inner radius when the angle of the loading is around 0°. The effect of tie reinforcing bars at joint increased the bearing capacity by up to 10% in any loading direction. In addition, when the torsional moment of the longitudinal beam was considered, the horizontal force was shared at each fulcrum, but it did not affect the joint bearing force.